Detailed/More Info:
Portland Mill {aka Victor Mill; On Battle Mountain]
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Info Database Last Updated 08.04.2024 (Entity News entries: 76)
Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 120 [CXX], Issue No. 10
Info Publication Date:
March 6, 1920
Info found on page:
349
Info Title:
Portland Gold Mining Co. Junks Two Mills
Its announced that the Portland Gold Mining Co. has abandoned two of its large mills and that these plants have been sold to junk-dealers, which lends to give one a pessimistic idea regarding the future of the Cripple Creek district.
graphic for visual presentation of textThe 600-ton mill at the mine was abandoned at the time the 1500-ton Independence Mill was completed about two years ago.
graphic for visual presentation of textThe 800-ton plant at Colorado City has also been idle for some time.
graphic for visual presentation of text Before the abandonment of these mills much of their machinery was placed in the new mill at Victor.
graphic for visual presentation of text
Notes/Text been Edited:
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 24.02.2020

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 118 [CXVIII], Issue No. 25
Info Publication Date:
June 21, 1919
Info found on page:
859
Info Title:
Portland Mill Schedule Treatment Charges
The Portland company has announced a new schedule of treatment charges on low-grade mine and dump ores, as follows:
graphic for visual presentation of textUp to $3 value, $2.00 per ton
graphic for visual presentation of text $3.50 at $2.25 per ton
graphic for visual presentation of text $4 at $2.50 per ton
graphic for visual presentation of text $4.50 at $2.65 per ton
graphic for visual presentation of text $5 at $2.75 per ton.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 07.03.2020

Type/Category of Info:
Industrial/Construction Notes
Info Source From:
The Mining and Scientific Press. Volume: 118 [CXVIII], Issue No. 22
Info Publication Date:
May 31, 1919
Info found on page:
766
Info Title:
Portland Victor Mill Tested Cotton-Base Fabric on Concentration Table
The E. I. Du Pout de Nemours & Co., in discussing coverings for concentration tables, state that linoleum has generally been used for this purpose, but has not been entirely satisfactory because the cyanide solution used blisters it, thus making its life short.
graphic for visual presentation of text Recently a new material has been successfully tried, especially in gold recovery. It is a cotton-base fabric having a pyroxylin coating. It is thinner and decidedly more pliable than linoleum, but is as waterproof as rubber.
graphic for visual presentation of text The Portland mill at Victor, Colorado, has operated one of its tables, covered with this material, continuously for a year without change. It showed no blistering and little deterioration otherwise. The material was designed originally to be used for automobile and furniture upholstering—it is a leather substitute, in fact.
graphic for visual presentation of text Thomas B. Crow, of the Portland mill, and Luther Lennox, assistant, invite mining and concentrator men interested in this subject to write them for any additional information desired.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 07.03.2020

Type/Category of Info:
Article
Info Source From:
Metallurgical and Chemical Engineering. Volume: 14 [XIV], Issue No. 8
Info Publication Date:
April 15, 1916
Info found on page:
415
Info Title:
Flotation to Come at Portland Victor Mill
The Portland G. M. company has officially announced that its older Victor mill, which was erected several years ago for the cyanidation of low-grade ores, is to be remodeled for flotation, with a capacity of 1000 tons daily.
graphic for visual presentation of text When these changes are in effect, this one company alone will be treating 2000 tons per day by flotation, using the Callow air-cell in both its Cripple Creek District mills.
Notes/Text been Edited:
Abstracted & slightly rewritten from larger text about 'The Western Metallurgical Field' p415->416, only taking a part linked to Cripple Creek
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Above Info was Last Updated on 10.02.2023 (09:36:35)
Above Info was First Seen 10.02.2023

Type/Category of Info:
Article
Info Source From:
Metallurgical and Chemical Engineering. Volume: 13 [XIII], Issue No. 12
Info Publication Date:
October 15, 1915
Info found on page:
722
Info Title:
Chilean Mills Are Used at the Portland Mill, Cripple Creek
Chilean mills are used at the Portland mill, Cripple Creek, for final grinding where a fine product is not required. Six-ft. Akron Chilean mills run at 36 to 41 r.p.m., using 2.5 to 3 tons of solution per ton of ore. Steel consumption per ton of ore ground is 0.797 lb. gross and 0.692 lb. net. Power consumption per ton of ore in coarse-crushing department is 1.86 hp.-hr. and in Chilean mills, 13.26 hp.-hr., or a total of 15.12 hp.-hr.
graphic for visual presentation of text Following are cost data.
graphic for visual presentation of text
graphic for visual presentation of textCoarse Crushing, per Ton
graphic for visual presentation of textChilean Mills, per Ton.
graphic for visual presentation of textTotal per Ton
graphic for visual presentation of textPower (at 0.842c. hp.-hr.)
graphic for visual presentation of text$0.0199
graphic for visual presentation of text$0.1118
graphic for visual presentation of text$0.1317
graphic for visual presentation of textLabor (operation)
graphic for visual presentation of text0.0318
graphic for visual presentation of text0.0179
graphic for visual presentation of text0.0497
graphic for visual presentation of textLabor (repairs)
graphic for visual presentation of text0.0103
graphic for visual presentation of text0.0039
graphic for visual presentation of text0.0142
graphic for visual presentation of textSupplies
graphic for visual presentation of text0.0284
graphic for visual presentation of text0.0482
graphic for visual presentation of text0.0765
graphic for visual presentation of text
graphic for visual presentation of text——————
graphic for visual presentation of text——————
graphic for visual presentation of text——————
graphic for visual presentation of textTotal
graphic for visual presentation of text$0.0904
graphic for visual presentation of text$0.1818
graphic for visual presentation of text$0.2722
Notes/Text been Edited:
Abstracted from larger text about 'Crushing and Grinding' p721->722, only taking a part linked to Cripple Creek
Internet Source Text Link(s) {Found/Seen/Known]:
Above Info was Last Updated on 09.02.2023 (21:06:02)
Above Info was First Seen 09.02.2023

Type/Category of Info:
Article
Info Source From:
Metallurgical and Chemical Engineering. Volume: 12 [XII], Issue No. 4
Info Publication Date:
April 1914
Info found on page:
221
Info Title:
Portland Mill Tidbit About Concentration
The rejection of sand tailing characterizes some present operations in which tagle concentration plays a part. Thus at Cripple Creek, the Portland company first concentrates the ore, removing sulpho-tellurides, and then classifies the remaining pulp into sand and slime, discarding the former.
Notes/Text been Edited:
Abstracted from larger text about 'The Western Metallurgical Field' p221->222, only taking a part linked to Cripple Creek
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Above Info was Last Updated on 09.02.2023 (09:24:15)
Above Info was First Seen 09.02.2023

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 23
Info Publication Date:
December 6, 1913
Info found on page:
907
Info Title:
Portland Mill, Victor/Battle Mtn. Production; November 1913
The Estimated production of the following district mill during November is as follows:
graphic for visual presentation of text
graphic for visual presentation of textWhere treated
graphic for visual presentation of textTons
graphic for visual presentation of textAv. value
graphic for visual presentation of textGross value
graphic for visual presentation of textPortland, Cripple Creek
graphic for visual presentation of text16,200
graphic for visual presentation of text$ 2.76
graphic for visual presentation of text$ 44,712
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 26.01.2020

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 15
Info Publication Date:
October 11, 1913
Info found on page:
589
Info Title:
Portland Mill, Victor/Battle Mtn. Production; September 1913
The reported production of the following district mill during September was as follows:
graphic for visual presentation of text
graphic for visual presentation of textPlants
graphic for visual presentation of textTonnage
graphic for visual presentation of textAv. val.
graphic for visual presentation of textGross val.
graphic for visual presentation of textPortland, Cripple Creek district
graphic for visual presentation of text14,600
graphic for visual presentation of text2.96
graphic for visual presentation of text$ 43,216
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 18.11.2019

Type/Category of Info:
Article
Info Source From:
Metallurgical and Chemical Engineering. Volume: 11 [XI], Issue No. 10
Info Publication Date:
October 1913
Info found on page:
571
Info Title:
Portland Victor Mill Visit by the American Electrochemical Society
In the Cripple Creek district on Saturday September 13 the majority of the party of people attending the 24th general meeting of the American Electrochemical Society visited the new Portland Cyanide Mill in Victor, where Mr. L. W. Lennox, assistant superintendent, conducted the party and explained the steps in the process. Here only low-grade mine and dump ore is treated, having a gross value of not more than $3.25 per ton.
graphic for visual presentation of text The ore is ground in cyanide solution in Chilean mills, and concentrated on Wilfley tables to remove the sulpho-tellurides which are shipped to the smelter. The remaining pulp is classified into sand and slime, the former being discarded and used for stope filling in the mine.
graphic for visual presentation of text The slime is thickened and agitated, and finally filtered on a rotary type of continuous vacuum filter. The gold solution is precipitated by zinc dust and collected in filter presses, from which it is removed from time to time, fluxed and melted.
Notes/Text been Edited:
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Above Info was Last Updated on 08.02.2023 (23:11:40)
Above Info was First Seen 30.05.2010

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 13
Info Publication Date:
September 27, 1913
Info found on page:
509
Info Title:
Portland Mill Addition Working
The additional Chilean mill is now working at the Portland mill.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 14.11.2019

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 10
Info Publication Date:
September 6, 1913
Info found on page:
392
Info Title:
Portland Mill, Victor/Battle Mtn. Production; August 1913
According to local statistics, the following Cripple Creek mill August output was:
graphic for visual presentation of text
graphic for visual presentation of textPlants
graphic for visual presentation of textOre treated tons
graphic for visual presentation of textAv. val. per ton
graphic for visual presentation of textGross val.
graphic for visual presentation of textPortland (Cripple Creek)
graphic for visual presentation of text15,800
graphic for visual presentation of text$ 2.50
graphic for visual presentation of text$ 39,500
graphic for visual presentation of text
graphic for visual presentation of text
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 11.11.2019

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 9
Info Publication Date:
August 30, 1913
Info found on page:
357
Info Title:
Cripple Creek Local Mill Production
During July, eight of the local mills, the Portland, Stratton's Independence, Colburn-Ajax, Kavanagh-Jo Dandy, Gaylord-Dante, Rex Mining & Milling Co., Wild Horse, and Isabella plants, treated 35,373 tons of ore with a gross value of $85,428.
graphic for visual presentation of text This low-grade ore ranged in value from $1.10 to $2.84 per ton, with a general average value of $2.41 per ton.
Notes/Text been Edited:
Abstracted from a somewhat longer source text talking about several local mills.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 11.11.2019

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 9
Info Publication Date:
August 30, 1913
Info found on page:
357
Info Title:
Portland Battle Mtn. Mill Addition
The tonnage of the Portland Co. local mill will be increased soon by the addition to the Portland Battle Mtn. mill.
Notes/Text been Edited:
Abstracted from a somewhat longer source text talking about several local mills.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 11.11.2019

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 6
Info Publication Date:
August 9, 1913
Info found on page:
241
Info Title:
Portland Mill, Victor/Battle Mtn. Production; July 1913
According to local statistics, the following Cripple Creek mill July output was:
graphic for visual presentation of text
graphic for visual presentation of textPlant
graphic for visual presentation of textTons
graphic for visual presentation of textAv. val.
graphic for visual presentation of textGross value.
graphic for visual presentation of textPortland (Cripple Creek)
graphic for visual presentation of text13,600
graphic for visual presentation of text2.60
graphic for visual presentation of text35,360
Notes/Text been Edited:
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 23.10.2019

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 4
Info Publication Date:
July 26, 1913
Info found on page:
162
Info Title:
Portland Mill Expands Its Machinery
At the Portland mill, another Chilean mill is being installed driven by a motor, and the transformer station is being enlarged.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 23.10.2019

Type/Category of Info:
General Mining News
Info Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 2
Info Publication Date:
July 12, 1913
Info found on page:
72
Info Title:
Portland Mill, Victor/Battle Mtn. Production; June 1913
According to local statistics, the following Cripple Creek mill gold production was:
graphic for visual presentation of text
graphic for visual presentation of textName
graphic for visual presentation of textTons.
graphic for visual presentation of textAv. val.
graphic for visual presentation of textGross value.
graphic for visual presentation of textPortland, Cripple Creek
graphic for visual presentation of text13,600
graphic for visual presentation of text3.00
graphic for visual presentation of text30,800
graphic for visual presentation of text
Notes/Text been Edited:
Abstracted and somewhat rewritten slightly
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 21.10.2019

Type/Category of Info:
Article
Info Source From:
Metallurgical and Chemical Engineering. Volume: 11 [XI], Issue No. 3
Info Publication Date:
March 1913
Info found on page:
123
Info Title:
Portland Victor Mill Working Fully
The nineteenth annual report of the Portland Gold Mining Company, Cripple Creek district, Colorado, was issued on February 3, and shows the company to be in excellent condition, with greatly improved metallurgical facilities.
graphic for visual presentation of text The new mill at Victor has continued to demonstrate its success in treating low grade ore which formerly was thrown on the dump as waste. Its capacity has been increased from 12,285 tons treated in December, 1911, to 14,791 tons in December, 1912.
graphic for visual presentation of text Additions have been made to increase the concentrating capacity, consisting of twelve concentrating tables. Further additions to plant consisted of four Pachuca tanks, one Dorr thickener and two classifiers.
graphic for visual presentation of text These changes have raised the original capacity of the mill from 300 tons per day to 500 tons. It is expected that the net profits from this mill will be equal to the dividend requirements of the company, leaving the profits from the old mill to be applied toward building up a substantial reserve fund.
graphic for visual presentation of text The average value per ton of ore treated in the new mill was $3.15, yielding a net profit of $1.17 per ton. The profits earned by this mill in 1911 and 1912 have equaled 90 per cent of its cost, and only a beginning has been made toward the treatment of the vast tonnage of low-grade ore available.
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Above Info was Last Updated on 08.02.2023 (18:38:23)
Above Info was First Seen 30.05.2010

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 65 [LXV], Issue No. 1687
Info Publication Date:
May 23, 1912
Info found on page:
xxxiv
Info Title:
Portland Battle Mountain Mill Expected to Make May Record
The Portland Gold Mining Co. mill on Battle mountain will make a new high tonnage record in May unless some accident should cause a temporary cessation of ore treatment.
graphic for visual presentation of text While the capacity of the Battle mountain plant has been classed as of 300 tons, Mill Manager Thomas Crowe is handling between 480 and 500 dry tons daily. The ore treated is of low grade taken out in development from the workings of the No. 2 shaft and reject from the house at this shaft.
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Above Info was Last Updated on 30.06.2023 (08:45:28)
Above Info was First Seen 15.07.2010

Type/Category of Info:
Article
Info Source From:
Mohave County Miner. Volume: 30 [XXX], Issue No. 27
Info Publication Date:
March 30, 1912
Info found on page:
4
Info Title:
Portland Battle Mountain Mill Improvements
The Portland Mill.
graphic for visual presentation of text———
graphic for visual presentation of text It is predicted by Superintendent Thomas Crowe of the Portland mill at Cripple Creek that in March about 14,000 tons will be treated at the Victor mill.
graphic for visual presentation of text Many additions are being made from time to time and new buildings are being erected at the mill, until now it covers the biggest portion of the east slope of Battle mountain.
graphic for visual presentation of text The slime tailings are being dumped into Eclipse gulch.
graphic for visual presentation of text
graphic for visual presentation of text There are 10 agitation tanks in the mill now. Less than a month ago a second tube mill was installed and the sixth Portland filter, made by the Colorado Iron Works, has been put in the mill.
graphic for visual presentation of text There are 31 concentrating tables, an increase of about eight since the first 300-ton unit was installed. A new Dorr thickener has been installed and a house built for it.
graphic for visual presentation of text In two months the mill will be just twice as large as the original plant and will have the capacity for treating twice as much ore.
graphic for visual presentation of text
graphic for visual presentation of text The sand tailings are dropped down an 800-foot stope and used for stope filing. The slime tailings are hauled in cars to Eclipse gulch and there dumped.
graphic for visual presentation of text The Portland metallurgists have successfully solved the problem of stacking the tailings, which has been one of the obstacles in local milling.—Denver Mining Science.
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Above Info was Last Updated on 30.03.2024 (18:56:19)
Above Info was First Seen 05.09.2011

Type/Category of Info:
Article
Info Source From:
Mining Science. Volume: 65 [LXV], Issue No. 1677
Info Publication Date:
March 21, 1912
Info found on page:
267
Info Title:
Portland Battle Mountain Mill Happenings
THE PORTLAND MILL.
graphic for visual presentation of text———
graphic for visual presentation of text It is predicted by Superintendent Thomas Crowe of the Portland mill at Cripple Creek that in March about 14,000 tons will be treated at the Victor mill. Many additions are being made from time to time and new buildings are being erected at the mill, until now it covers the biggest portion of the east slope of Battle mountain.
graphic for visual presentation of text The slime tailings are being dumped into Eclipse gulch.
graphic for visual presentation of text
graphic for visual presentation of text There are 10 agitation tanks in the mill now. Less than a month ago a second tube mill was installed and the sixth Portland filter, made by the Colorado Iron Works, has been put in the mill. There are 31 concentrating tables, an increase of about eight since the first 300-ton unit was installed. A new Dorr thickener has been installed and a house built for it.
graphic for visual presentation of text In two months the mill will be just twice as large as the original plant and will have the capacity for treating twice as much ore.
graphic for visual presentation of text
graphic for visual presentation of text The sand tailings are dropped down an 800-foot stope and used for stope filling. The slime tailings are hauled in cars to Eclipse gulch and there dumped. The Portland metallurgists have successfully solved the problem of stacking the tailings, which has been one of the obstacles in local milling.
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Above Info was Last Updated on 26.06.2023 (13:14:01)
Above Info was First Seen 26.06.2023

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Mining Magazine. Volume: 6 [VI], Issue No. 3
Info Publication Date:
March 1912
Info found on page:
191
Info Title:
Portland Gold Mining Co. Report About the Victor Mill
Several mills treating low-grade ore are in steady operation, the most successful of these being the mill of the Portland Gold Mining Co. at Victor. The results of the operation of this mill are given in the annual report of the company, which has just been made public.
graphic for visual presentation of textIn December 1911, 12,285 tons of ore of a gross value of $35,432, or an average of $2.80 per ton were treated. Of this content $28,533, or 80.5%, was recovered at an operating cost of $1.13 per ton.
graphic for visual presentation of textDuring the year the mill also treated 120,961 tons of waste from the former milling operations, having a gross content of $424,490, or $3.51 per ton. On this an average extraction of 81.4% was made.
graphic for visual presentation of textThe net operating profit of the mill for the year was $128,739, or a return of 38% on the cost of construction of the mill, which was $338,581.
graphic for visual presentation of text The conspicuous success of this mill will encourage the treatment of low-grade ore at Cripple Creek, and the productive life of the district will be correspondingly prolonged.
Notes/Text been Edited:
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Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 15.05.2021

Type/Category of Info:
Article
Info Source From:
Metallurgical and Chemical Engineering. Volume: 10 [X], Issue No. 3
Info Publication Date:
March 1912
Info found on page:
127
Info Title:
Portland Victor Mill Happenings
The excellent work done last year at the Victor mill of the Portland Gold Mining Company, is attracting very favorable attention. Not since the successful operation of the Stratton's Independence mill has such progress been made in the treatment of low grade ore. Indeed the feature of the work at Stratton's was the utilization of old dump ore already mined, but at the Portland the chief merit lies in the fact that low grade mine ore extracted in the course of development work and in the mining of high grade ore is being made to pay a good profit.
graphic for visual presentation of text One feature of the metallurgy still remains undisclosed, viz., the details of the Portland cyanide process which embodies the chemical treatment to which the ore is subjected.
graphic for visual presentation of text
graphic for visual presentation of text In January, 1911, the mill treated 8052 tons of ore, but the capacity of the plant was increased during the year so that in December, 1911, the total ore treated amounted to 12,285 tons. The gross value of the ore treated during the year was $3.51 per ton, but in December the value of the ore was only $2.80 per ton; but even on this lower grade ore the mill made a recovery of 80.5 per cent at a cost of only $1.1317.
graphic for visual presentation of text The extraction for year amounted to 81.4 per cent, netting a profit of $128,738.72 on rock which formerly was worthless to the company and thrown on the dump. As the total cost of construction of the mill, as officially announced, was only $338,580.96, it will be seen that the profits from another year's operations combined with those of the year and a half passed, will wipe out the cost of construction; and as there is a sufficient tonnage of low grade ore available to keep the mill running for a number of years to come, the profits will be a very important item to the company.
graphic for visual presentation of text
graphic for visual presentation of text Among the improvements made at the mill since the beginning of this year, is the installation of a large Portland filter of the revolving drum type. The former equipment filters have the following dimensions: diameter, 12 ft.; face of drum, 9 ft.; capacity, about 45 tons of pulp in 24 hours.
graphic for visual presentation of text The new large filter is 14 ft. in diameter, with a 12-ft. face, and has a capacity of 90 tons of pulp in 24 hours. In addition to the larger capacity, there are advantages in the deeper submergence of the filter in the pulp, and better opportunity for washing the cake free of cyanide solution and dissolved metals.
graphic for visual presentation of text
graphic for visual presentation of text Stope filling with mill tailing is another innovation which has been adopted during the past year. This has a double advantage in that it enables the company to take care of its old stopes at less expense than before, and at the same time leaves the surface of the property available for mining work.
Notes/Text been Edited:
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Above Info was Last Updated on 08.02.2023 (11:15:47)
Above Info was First Seen 06.02.2023

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Mining Magazine. Volume: 6 [VI], Issue No. 1
Info Publication Date:
January 1912
Info found on page:
32
Info Title:
Portland Battle Montain Mill News
Much of the low-grade ore is now being treated by mills at the mines, like at the new Portland mill which is taking 12,000 tons of $3 ore.
Notes/Text been Edited:
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Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 15.05.2021

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 25
Info Publication Date:
December 16, 1911
Info found on page:
1195
Info Title:
Portland Mill Treated Tonnage (But Which Mill is It?)
Denver Dec. 9—The Portland mill reports 11,800 tons treated in December{might possible be a typo for November?].
Notes/Text been Edited:
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 30.03.2019

Type/Category of Info:
General Mining News
Info Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 24
Info Publication Date:
December 9, 1911
Info found on page:
1150
Info Title:
Portland Battle Mountain Mill November Treatment
Portland—The statement is made that the new mill on Battle mountain treated about 12,000 tons in November. The last quarterly report showed a net profit of $1 per ton in the mill, which is said to have treated 100,000 tons.
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 30.03.2019

Type/Category of Info:
Abstracts of Official Reports
Info Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1660
Info Publication Date:
November 23, 1911
Info found on page:
486
Info Title:
Portland Gold Mining Co. Battle Mtn Mill Happenings
The new mill at the Portland mine at Cripple Creek treated. 29,559 tons of low-grade ore during the three months ending September 30 at a net profit of $33,110.78, according to a statement of the company. The total net profit of the company from the mill during the first nine months of this year was $100,939.16. Additional tanks and other apparatus necessary for treating the concentrates are being put in place at the mill.
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Above Info was Last Updated on 11.06.2023 (09:43:48)
Above Info was First Seen 11.06.2023

Type/Category of Info:
General Mining News
Info Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 19
Info Publication Date:
November 4, 1911
Info found on page:
913
Info Title:
Portland Victor Mill Results
Portland—A statement issued by the company is to the effect that during three months ended Sept. 30, the new mill at the mine treated 29,559 tons of ore at a net profit of $33,110; the net profit from the mill during the first nine months of the year was $100,939.
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 27.03.2019

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1655
Info Publication Date:
October 19, 1911
Info found on page:
380
Info Title:
Portland Battle Mountain Mill Changes
Some changes in the electrical equipment will be made shortly at the New Portland mill in the way of increasing the horse power.
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Above Info was Last Updated on 05.06.2023 (12:12:28)
Above Info was First Seen 05.06.2023

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 10
Info Publication Date:
September 2, 1911
Info found on page:
465
Info Title:
Portland's Victor Mill to Get an Addition
Denver Aug. 28—The Portland company, of Cripple Creek, is contemplating the immediate erection of an addition to its local mill to increase the capacity from 300 to 500 tons. The process used in the recently completed mill has proved to be successful.
graphic for visual presentation of text The quantity of ore treated during August will be about the same as that for July and may run close to 10,000 tons. The grade of the ore will be about the same as milled last month.
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 26.03.2019

Type/Category of Info:
Article
Info Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1647
Info Publication Date:
August 24, 1911
Info found on page:
177
Info Title:
Portland's Victor/Battle Mtn. Mill July 1911 Output
During July the Portland's Victor/Battle Mtn. plant processed 9,246 tons with an average value of $3.50 and a bullion value of $32,316.
Notes/Text been Edited:
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Above Info was Last Updated on 26.05.2023 (08:32:01)
Above Info was First Seen 26.05.2023

Type/Category of Info:
Article
Info Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1647
Info Publication Date:
August 24, 1911
Info found on page:
182
Info Title:
Portland Victor Mill Might Be Enlarged
The Portland Gold Mining Co. of Cripple Creek is contemplating the immediate erection of an addition to its Victor mill to make a 500-ton plant instead of 300, as at present.
graphic for visual presentation of text The Portland mill has proved a success and has done the work which it was planned to do. The tonnage for August will be about the same as that of July and may run close to 10,000 tons.
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Above Info was Last Updated on 26.05.2023 (08:40:12)
Above Info was First Seen 26.05.2023

Type/Category of Info:
Article
Info Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1641
Info Publication Date:
July 13, 1911
Info found on page:
35
Info Title:
Portland's Victor/Battle Mtn. Mill June 1911 Output
During June the Portland plant in Cripple Creek processed 8,770 tons with an average value of $3.00 and a bullion value of $26,310.
Notes/Text been Edited:
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Above Info was Last Updated on 22.05.2023 (08:24:10)
Above Info was First Seen 22.05.2023

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1637
Info Publication Date:
June 15, 1911
Info found on page:
624
Info Title:
Portland's Victor/Battle Mtn. Mill May 1911 Output

During May the Portland plant on Battle Mountain processed 10,075 tons with an average value of $3.753.57 and a bullion value of $35,976.75.

Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form, also fixed typo for Average Value
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Above Info was Last Updated on 20.05.2023 (08:35:49)
Above Info was First Seen 20.05.2023

Type/Category of Info:
Article
Info Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1628
Info Publication Date:
April 13, 1911
Info found on page:
399
Info Title:
Cripple Creek District March 1911 Output
Table has multiple errors; numbers don't match the given sums at the bottom total, neither does the sum per line always! Unknown where errors are, so I made best guesses!
CRIPPLE CREEK ORE PRODUCTION.
———

According to statements of the smelter and mill representatives and the accompanying estimates of values, the output of Cripple Creek mines in March amounted to 73,125 tons, carrying a gross bullion value of $1,358,455. This production is 3,979 tons in excess of that of February for tonnage, and $105,401 in value.

Increases are shown at all of the plants, with the local mills handling an exceptionally heavy tonnage. This output is largely due to the favorable weather condition. The output:

Plant and location
Tonnage
Av.
Value
Total
Value
Standard Mill (U. S. R. & R.), Colorado City 14,350
14,050
22.00
$22.54
315,700
$316,700
Smelters, Denver & Pueblo 4,325
4,025
65.00
$67.24
270,925
$270,625
Golden Cycle, Colorado City 25,200
25,000
$20.00 504,000
$500,000
Portland mill, Colorado City 10,000 $20.00 $200,000
Portland mill, Battle Mountain 8,800 $3.60 $31,680
Stratton's Independence, Battle Mountain 9,250 $3.40 32,450
$31,450
Wild Horse mill, Bull Hill 12,000
2,000
3.00
$4.00
13,600
$8,000
Totals 73,125 $1,358,455
Notes/Text been Edited:
Table has multiple errors; numbers don't match sums at the bottom total, nor does per line always! Unknown where errors are, so I made best guesses!
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Above Info was Last Updated on 14.05.2023 (07:30:41)
Above Info was First Seen 13.05.2023

Type/Category of Info:
Industrial/Construction Notes
Info Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1626
Info Publication Date:
March 30, 1911
Info found on page:
346
Info Title:
Dorr Cyanide Machinery Co. Machinery for Portland Battle Mtn. Mill
The Dorr Cyanide Machinery Co. of Denver has recently shipped three Dorr thickeners and one Dorr classifier to the Portland Gold Mining Co. for its new mill at Cripple Creek.
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Above Info was Last Updated on 11.05.2023 (12:16:14)
Above Info was First Seen 11.05.2023

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1621
Info Publication Date:
February 23, 1911
Info found on page:
221
Info Title:
Portland Gold Mining Co. Happenings
According to the report of President Peck of the Portland Co. the ore treated at the Battle mountain plant came from the mine. The mill has cost to date $307,676.58 and Mr. Peck advises the increasing of the capacity of the mill to 700 tons a day.
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Above Info was Last Updated on 09.05.2023 (21:47:23)
Above Info was First Seen 09.05.2023

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Mining Magazine. Volume: 4 [IV], Issue No. 1
Info Publication Date:
January 1911
Info found on page:
34
Info Title:
Portland Battle Montain Mill News
The Portland G.M. Co., the big neighbour of Stratton's Independence, is also meeting with success in handling low-grade ore. The new mill built by this company has been steadily treating ore since July 1 and is now crushing 8000 to 9000 tons per month.
graphic for visual presentation of text An additional 6-ft. Chilean mill and set of rolls has been purchased which, with more screens also to be put in, will permit 15,000 tons per month to be handled after January 1.
graphic for visual presentation of text The value of the ore now being crushed is $2.50 to $3 per ton, and the cost of treatment, including tailing loss, less than $2. This cost will be reduced as the capacity of the mill is increased.
Notes/Text been Edited:
Abstracted
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Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 05.05.2021

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Mining Magazine. Volume: 4 [IV], Issue No. 1
Info Publication Date:
January 1911
Info found on page:
34
Info Title:
Portland Mill, Victor/Battle Mtn. Production; November 1910
During November Shipments from the district to the Portland Battle Mt. Mill amounted to 8,750 tons of an average $3.50 per ton for a total of $30,625.
Notes/Text been Edited:
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Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 05.05.2021

Type/Category of Info:
Correspondence and Discussion
Info Source From:
Metallurgical and Chemical Engineering. Volume: 9 [IX], Issue No. 1
Info Publication Date:
January 1911
Info found on page:
19
Info Title:
Portland G.M. Co. Cyaniding Work
Probably the most important event in cyaniding during 1910 was the completion and operation of the Cripple Creek mill of the Portland company. The full details of the process have been kept secret, but it is a direct cyanidation of raw ore, with the addition of a substance or mixture, probably a halogen cyanide and an oxidizing substance. The process was worked out by the metallurgical staff of the company.
graphic for visual presentation of text After coarse crushing the ore is ground in cyanide solution in Chilean mills and concentrated on Wilfley tables. The concentrate is shipped to the old mill at Colorado City. The tailing is classified, the sand being rejected and the slime concentrated on Card tables.
graphic for visual presentation of text The Card concentrate is shipped to the Colorado City mill, and the tailing thickened, agitated and filtered. Zinc dust precipitation according to Merrill's process is used. The plant has a number of new devices, such as the Akins classifiers and Rothwell & Akins agitating tanks, and Portland continuous revolving slime filters.
graphic for visual presentation of text The mill is in steady operation on low-grade mine ore, and its successful operation will point the way to the erection of other local mills.
Notes/Text been Edited:
Abstracted & slightly rewritten from larger text about 'Status of Metallurgy in Colorado in 1910' p18->20, only taking a part linked to Cripple Creek
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Above Info was Last Updated on 06.02.2023 (13:38:51)
Above Info was First Seen 04.02.2023

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1613
Info Publication Date:
December 29, 1910
Info found on page:
635
Info Title:
Portland Battle Mountain Mill Prepares for Larger Output
The Portland mill, on Battle mountain, will be ready to treat 400 tons a day in the near future, probably soon after the first of the year, inasmuch as a fourth Chilean mill is now being installed.
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Above Info was Last Updated on 05.05.2023 (22:25:17)
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Type/Category of Info:
General Mining News
Info Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 26
Info Publication Date:
December 24, 1910
Info found on page:
1276
Info Title:
Portland Victor Mill to Install Chilean Mill
Portland—It is stated that the Portland mill on Battle mountain, near Victor, will install a fourth Chilean mill and be ready to treat 400 tons per day soon after Jan. 1.
graphic for visual presentation of text The extraction is said to be close to 90 per cent, and the average yield of the ore treated, $3.50 per ton.
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Above Info was Last Updated on 26.12.2021 (16:06:48)
Above Info was First Seen 26.03.2010

Type/Category of Info:
General Mining News
Info Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 24
Info Publication Date:
December 10, 1910
Info found on page:
1177
Info Title:
Portland Victor Mill Success Creates Rumor
Portland—Pres. F. G. Peck says that the success of the Battle Mountain mill, which has been treating 800 tons of ore per month, has brought under consideration the question of enlarging it, and that the immense amount of low-grade ore in the district warrants the building of another mill by this company, to treat custom ores.
graphic for visual presentation of text At present, however, this new enterprise has simply been under discussion.
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Above Info was Last Updated on 25.12.2021 (16:27:13)
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Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1610
Info Publication Date:
December 8, 1910
Info found on page:
558
Info Title:
Portland's Victor/Battle Mtn. Mill November 1910 Output
That the Portland Battle Mountain plant will be made larger is certain. This work will begin after the first of the year. During November the mill processed 8,750 tons with an average value of $3.50 and a bullion value of $30,625.
Notes/Text been Edited:
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Above Info was Last Updated on 03.05.2023 (10:03:27)
Above Info was First Seen 12.07.2010

Type/Category of Info:
General Mining News
Info Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 23
Info Publication Date:
December 3, 1910
Info found on page:
1125
Info Title:
Portland Victor Mill Treats 100 Tons Daily
Portland—The Portland mill, on Battle mountain, is now said to be treating 100 tons per day at a cost of not to exceed $2 per ton.
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Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1606
Info Publication Date:
November 10, 1910
Info found on page:
453
Info Title:
Portland's Victor/Battle Mtn. Mill October 1910 Output
During October the Portland plant on Battle Mountain processed 8,500 tons with an average value of $3.60 for a total value of $30,620.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form, I also corrected Typo for Average Value as source number was just wrong!
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Above Info was Last Updated on 30.04.2023 (21:24:29)
Above Info was First Seen 30.04.2023

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1597
Info Publication Date:
September 8, 1910
Info found on page:
236
Info Title:
Portland's Victor/Battle Mtn. Mill August 1910 Output
During August the new Portland mill worked to full capacity, lacking only 100 tons of handling 9,000 tons, as it processed 8,900 tons with an average value of $3.40 and a bullion value of $30,260.
Notes/Text been Edited:
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Type/Category of Info:
Article
Info Source From:
The Mining Magazine. Volume: 3 [III], Issue No. 3
Info Publication Date:
September 1910
Info found on page:
181
Info Title:
Portland Battle Mountain Mill Opened in July
The most notable event of July month, undoubtedly, was the opening of the new mill of the Portland Gold Mining Co., situated near the mine on Battle Mountain and designed to treat ore too low in grade to stand shipment to Colorado City.
graphic for visual presentation of text The process is one of concentration followed by cyanidation. The only peculiarity in the treatment is the addition of a secret chemical to the slime-pulp going to the agitators. Owing to threatened patent litigation the company has not published details regarding this.
graphic for visual presentation of text The ore sent to this mill assays $2.40 per ton and it is stated that the net profit is 75c. per ton.
Notes/Text been Edited:
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Above Info was Last Updated on 10.10.2021 (18:51:24)
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Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 7
Info Publication Date:
August 13, 1910
Info found on page:
332
Info Title:
Portland Victor Mill Stuff
Denver, Aug. 6—Referring to the new Portland mill at Victor, mentioned in the JOURNAL of July 30, it is now freely stated that by eliminating the preliminary roast of the sulpho-telluride ores, and substituting the addition of a special solution in the agitators, the saving on the low-grade ore (which averages $4 per ton) is brought up to 90 per cent., and at a reduced cost of 40c. over the roasting method.
graphic for visual presentation of text The total cost of treatment is said to be $1 per ton. These statements, however, are not officially made by the Portland company.
graphic for visual presentation of text No information has been given out as to the exact nature of the special solution, though cyanogen iodide has been indicated. The reason for keeping it secret at present is said to be some threatened trouble as to patents.
Notes/Text been Edited:
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Above Info was Last Updated on 20.12.2021 (07:27:16)
Above Info was First Seen 24.03.2010

Type/Category of Info:
Correspondence and Discussion
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1593
Info Publication Date:
August 11, 1910
Info found on page:
131
Info Title:
Skepticisms to the Portland Process
HAS ROASTING BEEN ELIMINATED IN CYANIDING?
graphic for visual presentation of text———
graphic for visual presentation of textDoes the New Portland Process Represent Any Advance in the Treatment Given to the Sands?
graphic for visual presentation of text———
graphic for visual presentation of textBy John R. Wood.
graphic for visual presentation of textSecretary of the Boulder County Metal Mining Association.
graphic for visual presentation of text
graphic for visual presentation of text From what I have been able to learn of the new Portland mill, I fail to see that it represents any remarkable advance in the treatment of ore by the cyanide process.
graphic for visual presentation of text
graphic for visual presentation of text I have not had an opportunity to visit the mill personally, but I have talked with several who have, I have read the description published in Mining Science, July 28, and it looks very much to me as though the "mountain had labored and brought forth a mouse."
graphic for visual presentation of text
graphic for visual presentation of text It is announced that the use of the special solution, or "googoo," eliminates roasting, bringing the recovery up from 60% or 70% to 90% or better, and that this is done at a cost of less than 10 cents a ton, whereas the cost of roasting is from 40 to 60. cents a ton.
graphic for visual presentation of text
graphic for visual presentation of text But it should be noted that the special solution is used only on the slimes. The concentrates are shipped to the company's mill at Colorado City.
graphic for visual presentation of text
graphic for visual presentation of text I do not know what percentage of the ore these concentrates form, but certainly they are a very considerable part of it, and for this part roasting is not eliminated. The problem of treating the sands without roasting is a very different one from treating the slimes, and so far as I can see we are no nearer to a solution of it than we were before.
graphic for visual presentation of text
graphic for visual presentation of text At the Portland mill, the total cost of treatment is said to be less than one dollar a ton, but to this, it seems, we must add the expense of subsequent treatment of the concentrates. At the Golden Cycle mill the total cost of treating all the ore, including roasting, I am told, will not run over $1.25 a ton, and is probably nearer $1.15.
graphic for visual presentation of text Taking everything into consideration, will the new Portland mill make any better showing?
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Above Info was Last Updated on 27.04.2023 (09:50:19)
Above Info was First Seen 27.04.2023

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1593
Info Publication Date:
August 11, 1910
Info found on page:
139
Info Title:
Portland Mill, Victor/Battle Mtn. Mill July 1910 Output
The Portland Co.'s new mill on Battle mountain operated successfully during July and an increased valuation is reported, although the tonnage was lighter by reason of the holidays and the loss of 36 hours by the shutting off of electric power during storms. The plant processed 8,643 tons with an average value of $3.32 and a bullion value of $28,694.
Notes/Text been Edited:
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Above Info was Last Updated on 27.04.2023 (13:18:04)
Above Info was First Seen 27.04.2023

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1592
Info Publication Date:
August 4, 1910
Info found on page:
116
Info Title:
Portland Co. Mill(s) Gets Stratton Estate Ore
The ore from the Stratton estate is shipped to the Portland Co., and it is said the proposed mill on Globe Hill will be constructed on similar lines and use the same process as the Battle Mountain plant of that company.
Notes/Text been Edited:
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Above Info was Last Updated on 27.04.2023 (09:25:50)
Above Info was First Seen 27.04.2023

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 5
Info Publication Date:
July 30, 1910
Info found on page:
230
Info Title:
Portland Battle Mountain Mill Formal Opened in June
Denver, July 25—The Portland Gold Mining Company's new 300-ton mill, erected at the mine near Victor, at a cost of $250,000, has sent out its first bullion valued at about $9000, and held a formal opening June 19, at which all the mine managers of Cripple Creek, bank presidents, railway heads, and metallurgists from other parts of the State were present.
graphic for visual presentation of text The process of reduction at the Portland mill is described as cyaniding, together with what is called a secret process, owned by the company.
graphic for visual presentation of text The mine is producing 550 tons per diem, 300 tons of which is treated at this mill, and not the dump ore, as has been stated. The president informed the visitors that the mill was running at a profit, and the percentage of saving higher than was expected, but no official statement was made of the grade of ore being milled, or the cost of treatment.
graphic for visual presentation of text The capitalization of this company is $3,000,000, and the dividends paid to date amount to $9,037,080.
Notes/Text been Edited:
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Above Info was Last Updated on 19.12.2021 (10:11:18)
Above Info was First Seen 19.12.2021

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 2
Info Publication Date:
July 9, 1910
Info found on page:
86
Info Title:
Portland Mill, Victor/Battle Mtn. Production; June 1910
Denver, July 2—The New Portland mill appeared in the list of reduction works treating Cripple Creek ores for the first time last month, 8863 tons of an average value of $2.46 having been handled.
graphic for visual presentation of text The cost of treatment has not been made known to the public, but it is stated to be about $1 per ton.
Notes/Text been Edited:
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Above Info was Last Updated on 27.04.2023 (13:17:52)
Above Info was First Seen 18.12.2021

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1588
Info Publication Date:
July 7, 1910
Info found on page:
18
Info Title:
Portland's Victor/Battle Mtn. Mill June 1910 Output
During June operation at the Portland G. M. Co., new Battle Mountain mill commenced. This plant uses the secret process invented by the company's employees and is handling the low-grade dump ores with success. Ore of as low an average grade as $2.46 per ton was put through the mill during the month, and the profit is said to exceed $1 a ton. No official figures as to the actual saving have been made public, though the amount handled is placed at 8,863 tons. The plant processed 8,863 tons with an average value of $2.46 and a total value of $21,802.98.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form.
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Above Info was Last Updated on 24.04.2023 (09:50:48)
Above Info was First Seen 11.07.2010

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 61 [LXI], Issue No. 1579
Info Publication Date:
May 5, 1910
Info found on page:
427
Info Title:
Portland Battle Mountain Mill to Commence May 1
The finishing touches are being put to the Portland Gold M. Co.'s new mill and the machinery is geared up and about ready to commence crushing. The date set for commencement is May 1.
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Above Info was Last Updated on 19.04.2023 (12:15:45)
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Type/Category of Info:
Article
Info Source From:
The Mining Magazine. Volume: 2 [II], Issue No. 2
Info Publication Date:
February 1910
Info found on page:
107
Info Title:
Portland Battle Mountain Mill Nearly Completed
The striking feature of the year, metallurgically, was this development of mills. The Portland company has nearly completed a 400-ton plant to treat low-grade ore and dumps.
graphic for visual presentation of text Details have not been made public, but it is known to be a non-roasting process whereby tellurides are broken up and the gold dissolved as in cyanidation. The exact solvent used is a secret, the process having been discovered in the company's own laboratory.
graphic for visual presentation of text It is enthusiastically claimed that it will be possible to treat profitably all ore worth more than $1 per ton. The mill is situated on the east slope of Battle mountain near Shaft No. 2.
graphic for visual presentation of text The dump, which is estimated to contain 2,000,000 tons, is to be handled by caving, the ore being delivered to electric cars in a drift below. These will carry it to the shaft where it will be hoisted and delivered to bins of 500 tons capacity. The bins are of steel construction, cylindrical in shape, 36 ft. high and 26 in. diam.
graphic for visual presentation of text The bottoms are of concrete, and the ore is to form its own angle of test, being drawn on a steel conveyor, 4 ft. wide and of variable speed. This principle, by the way, has been applied with marked success in the coarse - crushing plant of the Boston plant at Bingham, Utah.
graphic for visual presentation of text The ore at the Portland is to pass from the conveyor under magnets to remove stray nails and steel. From the magnets it goes over a grizzley, which delivers the coarse to a large Blake crusher. From the crusher it goes to two sets of 24 by 48 in. Colorado Iron Works rolls set tandem with impact screens between.
graphic for visual presentation of text These are said to be the largest rolls used in a Colorado mill and have an estimated capacity of 1200 tons per 24 hours, crushing to 3/8 in. From the rolls the ore goes by conveyor belt to four Akron 6-ft. Chilean mills through storage-bins with automatic feed.
graphic for visual presentation of text It is to be crushed here to 30 mesh in cyanide, and the new solution, and to travel next to concentrating tables. The concentrate will flow by gravity to a 1000-ton bin having a filter-bottom through which the solution is to drain.
graphic for visual presentation of text From the bin the concentrate may be dumped into freight cars and shipped to the company's mill at Colorado City for further treatment. The tailing from the tables will be sent through Akins spiral classifiers, the slime passing to Rothwell de-waterers, and the sand to second and third Akins classifiers to be washed with fresh water and thrown away.
graphic for visual presentation of text The slime from the Rothwell de-waterers will be sent to a canvas plant for further treatment and concentration and finally through six agitating-tanks 36 ft. high and 20 in. diam. to revolving filters somewhat similar to the Oliver, and thence to the precipitation room.
graphic for visual presentation of text The whole mill is being built with an eye to automatic operation and low running costs. J. M. Tippett, the chemist, and Thos. B. Crowe, the metallurgist, have the best wishes of the camp and the profession back of them.
graphic for visual presentation of text It may be noted that in the use of concentrating tables, the Portland will resemble the Stratton's Independence mill. It will differ essentially in the introduction of a new solvent supplementary to cyanide.
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Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 05.05.2021

Type/Category of Info:
Correspondence and Discussion
Info Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2579; 26
Info Publication Date:
December 25, 1909
Info found on page:
859
Info Title:
Clancy Process Not Used by Any Portland Mill
Researches upon Cripple Creek Telluride Ore.
graphic for visual presentation of textThe Editor:
graphic for visual presentation of text Sir—Kindly give publicity to this letter in reply to Henry B. Haigh's article in your issue of November 20.
graphic for visual presentation of text
graphic for visual presentation of text John Collins Clancy was never chief chemist of the Portland mill. He worked in our laboratory a few months at day's pay. J. M. Tippett was and is the only chief chemist we ever had and Thos. B. Crowe was his assistant before his promotion. The use of cyanogen iodide in connection with potassium cyanide as a solvent for telluride of gold and the manner of producing it in contact with the ore, was the invention of Mr. Crowe and Mr. Tippett and was never claimed by Mr. Clancy until after he left the service of the Portland company.
graphic for visual presentation of text Our laboratory notes from day to day show this, and Mr. Clancy was not even in the State of Colorado when the experiments were made, as shown by the company's records. The process was abandoned by the Portland company over a year ago on account of the high cost of the chemicals used.
graphic for visual presentation of text The Portland company is not now using in its new mill or any of its old mills any process Mr. Clancy ever used during the short time he was with the Portland company: or any chemical ever suggested by him to us, or any process, or chemical that could be construed as relating to any patent or suggestion of his, even in the most remote manner.
graphic for visual presentation of text
graphic for visual presentation of textThe Portland Gold Mining Co.,
graphic for visual presentation of textBy Frank G. Peck, President.
graphic for visual presentation of textColorado Springs, Colorado, December 2.
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Above Info was Last Updated on 30.04.2022 (23:01:14)
Above Info was First Seen 30.04.2022

Type/Category of Info:
Correspondence and Discussion
Info Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2574; 21
Info Publication Date:
November 20, 1909
Info found on page:
691
Info Title:
Portland New Mill Said to Use the Clancy Process
Researches Upon Cripple Creek Telluride Ore.
graphic for visual presentation of textThe Editor:
graphic for visual presentation of text Sir—As the Mining and Scientific Press was one of several American journals that published an article 'edited by Thomas B. Crowe', which appeared in the Chemical, Metallurgical & Mining Society's Journal, I beg to hand you herewith a copy of a communication that I am addressing to the society referred to, which might interest your readers.
graphic for visual presentation of text
graphic for visual presentation of text"Chemical, Metallurgical & Mining Society, of South Africa, Johannesburg, South Africa.
graphic for visual presentation of text Gentlemen—Several American mining journals having published an article 'edited by Thomas B. Crowe', which evidently appeared in your journal, we have thought it might interest your membership to know that the process which Mr. Crowe describes, is not one of his invention as you might infer, but the invention of John Collins Clancy. It is the subject of Transvaal Patent, No. 90, of 1909.
graphic for visual presentation of text Further, the same Thomas B. Crowe was Mr. Clancy's second assistant during a portion of the time that Mr. Clancy was the chief chemist of the Portland Gold Mining Co., at the time that Mr. Clancy successfully demonstrated the working of his process for the treatment of telluride ores on a large commercial scale without roasting. It was during this period of association that Mr. Clancy gave Mr. Crowe access to all of his books and data.
graphic for visual presentation of text "It would hardly seem necessary to add anything further than to say that the Portland company is working under a written executed license-agreement from Mr. Clancy to use his process, and that the successful operation of the new 300-ton plant which that company is now building on its own mine at Victor, Colorado, is based upon the success of the exhaustive demonstrations made with the Clancy non-roasting process."
graphic for visual presentation of text
graphic for visual presentation of textHENRY B. HAIGH.
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Above Info was Last Updated on 30.04.2022 (22:57:43)
Above Info was First Seen 30.04.2022

Type/Category of Info:
General Mining News
Info Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2571; 18
Info Publication Date:
October 30, 1909
Info found on page:
579
Info Title:
Portland New Mill Has Machinery on Ground
The structural steel work for the new mill of the Portland Gold Mining Co. is nearly complete, and the machinery is on the ground. It is expected that the plant will be ready for operation by the first of the year.
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Above Info was Last Updated on 28.04.2022 (12:19:00)
Above Info was First Seen 28.04.2022

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2569; 16
Info Publication Date:
October 16, 1909
Info found on page:
522
Info Title:
New Portland Mill Progressing
DENVER, COLORADO—Construction work on the new Portland mill is progressing rapidly.
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Above Info was Last Updated on 28.04.2022 (09:56:17)
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Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 60 [LX], Issue No. 1545
Info Publication Date:
September 9, 1909
Info found on page:
235
Info Title:
Portland Battle Mountain Mill Expected to Be Ready in November
Work is progressing satisfactorily to the management of the Portland Co. with the new plant, and the mill should be ready for operation by the middle of November.
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Above Info was Last Updated on 10.04.2022 (13:55:53)
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Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2559; 6
Info Publication Date:
August 7, 1909
Info found on page:
180
Info Title:
Small Labor War Around Grading for Portland Mill
DENVER, COLORADO—A small labor war was precipitated recently by the contractors on the grading for the new Portland mill importing Italian laborers for the work. The Italians were run out of camp and one shot in the ensuing fracas.
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Above Info was Last Updated on 23.04.2022 (07:29:34)
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Type/Category of Info:
General Mining News
Info Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2558; 5
Info Publication Date:
July 31, 1909
Info found on page:
139
Info Title:
Foundation Work for New Portland Mill
The Portland Gold Mining Co. of Victor has commenced grading for the foundations of its new mill between No. 2 and 3 shafts on Battle mountain. Frank M. Kurie is manager.
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Above Info was Last Updated on 22.04.2022 (09:30:25)
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Type/Category of Info:
General Mining News
Info Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2555; 2
Info Publication Date:
July 10, 1909
Info found on page:
43
Info Title:
New Portland Mill Excavating & Grading Commenced
Work has commenced on the excavations and road-bed at the site of the new mill to be constructed by the Portland Gold Mining Co. on Battle mountain for the local treatment of such low-grade ores as will not pay for the transportation to the mill of the company at Colorado City. The plant is to have an initial capacity of 300 tons per day, and will be so constructed as to permit of enlargement.
graphic for visual presentation of text The mine is shipping between 200 and 250 tons per day to the Colorado City plant, and this tonnage will be maintained.
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Above Info was Last Updated on 21.04.2022 (23:30:33)
Above Info was First Seen 21.04.2022

Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 60 [LX], Issue No. 1536
Info Publication Date:
July 8, 1909
Info found on page:
37
Info Title:
New Portland Mill Excavating & Grading Commenced
Work commenced today on the grading of the road-beds to the millsite selected by the Portland Co. for its new mill. The contract calls for completion of the road in 30 days, so as to permit the delivery of building material and machinery for the plant.
graphic for visual presentation of text Excavating for the millsite has commenced.
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Above Info was Last Updated on 20.03.2022 (22:18:10)
Above Info was First Seen 20.06.2010

Type/Category of Info:
Special/Editorial Correspondence
Info Source From:
Mining and Scientific Press. Volume: 98 [XCVIII], Issue No. 2553; 26
Info Publication Date:
June 26, 1909
Info found on page:
880
Info Title:
New Portland Mill Construction Soon to Commence
DENVER, COLORADO—At Cripple Creek work will shortly commence on the construction of the Portland G. M. Co.'s mill. The site selected is midway between No. 2 and No. 3 shafts, on the northeast slope of Battle mountain.
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Above Info was Last Updated on 21.04.2022 (10:15:30)
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Type/Category of Info:
General Mining News
Info Source From:
The Western Investors Review. Volume: 15 [XV], Issue No. 11
Info Publication Date:
June 1909
Info found on page:
10
Info Title:
Portland Gold Mining Co. Announced New Cyanide Mill
Following a meeting of the directors of the Portland Gold Mining company here today, announcement was made that the company has definitely decided to build its proposed large cyanide mill in the vicinity of the mine at Victor.
graphic for visual presentation of text This has been under consideration since the company's chemist worked out a method of treating low grade ore by cyaniding without roasting, which involves less cost than any other known process.
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Above Info was First Seen 24.08.2023

Type/Category of Info:
Article
Info Source From:
Mines and Minerals. Volume: 29 [XXIX], Issue No. 10
Info Publication Date:
May 1909
Info found on page:
444
Info Title:
Portland Cyanide Work
For several years past Colorado metallurgists have been attempting to solve the metallurgical puzzle presented by the low-grade ores of Cripple Creek. Millions of tons of ore running from $3 to $10 per ton have lain on the great dumps for years, while other millions were exposed in hundreds of miles of underground workings.
graphic for visual presentation of text The Portland company alone had enough low-grade ore in its forty odd miles of workings to materially increase the Cripple Creek gold production provided a method of profitable treatment could be devised.
graphic for visual presentation of text Shipping the ore to the Colorado Springs reduction plant of the company cost $1 per ton, roasting the ore cost $.76 per ton, and the other milling expenses ate up the small margin of profit.
graphic for visual presentation of text Thus, for some years previous to 1907, the issues were clearly presented, first, to eliminate roasting the ores if possible, and, second, to eliminate freight charges by building mills at the mines.
graphic for visual presentation of text It will, of course, be understood that until a way of eliminating the roasting of the tellurium ores was discovered, it would be useless to erect mills at the Cripple Creek mines where roasting costs even more than at Colorado Springs.
graphic for visual presentation of text
graphic for visual presentation of text During the two years in which the Stratton Independence and Golden Cycle metallurgists have been evolving their plants, those of the Portland company have also been most active.
graphic for visual presentation of text It is now common knowledge that the widely advertised Moore-Clancy process was given an extended trial at the experimental mill of the company but was evidently found unsuitable. The great amount of experimental work, however, did result in the evolution of what is known as the "Portland process," whose details are as yet unavailable.
graphic for visual presentation of text It has been thoroughly tried out at the company's Cripple Creek 10-stamp experimental plant, however, with such success that a large mill is soon to be built close to the mines.
graphic for visual presentation of text The annual report of the company recently issued says that from many tests the company is convinced that the problem of treating the low-grade dump ores has been solved.
graphic for visual presentation of text The directors have decided to back up their judgment by the expenditure of at least $100,000 for a 300-ton mill, erected near the mine on Battle Mountain, to treat the great company dumps. These contain enough ore to run the mill for many years at an estimated net profit of from $1 to $2.50 per ton.
Notes/Text been Edited:
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Above Info was First Seen 22.03.2019

Type/Category of Info:
General Mining News
Info Source From:
Mining and Scientific Press. Volume: 98 [XCVIII], Issue No. 2543; 16
Info Publication Date:
April 17, 1909
Info found on page:
537
Info Title:
Portland Gold Mining Co. Happenings
At the directors meeting of the Portland Gold Mining Co. the regular quarterly dividend was declared, but at the rate of 3c. instead of 4, as formerly. The reduction is said to be for the purpose of holding a reserve for mill construction. By next meeting the directors will have decided the capacity of the plant to be installed.
graphic for visual presentation of text The Clancy process will be used, thereby obviating roasting.
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Above Info was Last Updated on 19.04.2022 (08:29:06)
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Type/Category of Info:
General Mining News
Info Source From:
Mining and Scientific Press. Volume: 98 [XCVIII], Issue No. 2534; 7
Info Publication Date:
February 13, 1909
Info found on page:
236
Info Title:
Portland Gold Mining Co. Proposes a Local Mill at Victor
At the annual stockholders' meeting of the Portland Gold Mining Co. it was learned the company has been trying the Tippet-Crowe and Moore-Clancy processes on its ore and also a process which will be known as the Portland process.
graphic for visual presentation of text These tests have sufficiently demonstrated that crude ore can now be treated, thus effecting a saving of 76 cents per ton for roasting and $1 per ton for transport to Colorado Springs.
graphic for visual presentation of text The company now proposes to erect, at an early date, a 300 or 500-ton mill at Victor to put the Portland process into practical operation.
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Above Info was Last Updated on 16.04.2022 (19:47:01)
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Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 58 [LVIII], Issue No. 12
Info Publication Date:
September 17, 1908
Info found on page:
237
Info Title:
Portland G. M. Co. Experimental Plant Soon Ready
Work on the experimental plant of the Portland G. M. Co. is being pushed rapidly and it is expected that the mill will be in full operation some time during the present month.
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Above Info was Last Updated on 03.04.2023 (20:17:00)
Above Info was First Seen 15.06.2010

Type/Category of Info:
General Mining News
Info Source From:
The Mining World. Volume: 29 [XXIX], Issue No. 9
Info Publication Date:
August 29, 1908
Info found on page:
330
Info Title:
Portland Cyanide Mill in Course of Construction
Cripple Creek—The new Portland cyanide mill is in course of construction and it is expected to be ready for the installation of machinery, which is all on the ground, in the course of two or three weeks. It will have a capacity of 500 tons per day.
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Type/Category of Info:
General Mining News
Info Source From:
Mining Science. Volume: 58 [LVIII], Issue No. 9
Info Publication Date:
August 27, 1908
Info found on page:
176
Info Title:
Portland Gold Mining Co. Starts Work on New Mill
Work has been started on the Portland Co.'s mill, which will be located near the city reservoirs on Battle Mtn. The plant will have a capacity of 500 tons.
graphic for visual presentation of text Excavations for the foundations are being made and the machinery is arriving.
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Above Info was Last Updated on 01.04.2023 (07:50:51)
Above Info was First Seen 15.06.2010

Type/Category of Info:
General Mining News
Info Source From:
The Mining World. Volume: 29 [XXIX], Issue No. 5
Info Publication Date:
August 1, 1908
Info found on page:
178
Info Title:
Portland Local Cyanide Mill Plans
Cripple Creek—The great Portland Mining Co., which has for two years been considering the erection of a large cyanide plant at the mine to handle the enormous tonnage of dump material and also the vast amount of low-grade ore in its miles of drifts and slopes is now practically prepared to go ahead with the project.
graphic for visual presentation of text It is stated that Frank Peck, the present manager, is about to put the scheme into practicable shape.
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Above Info was Last Updated on 30.12.2023 (08:24:55)
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Type/Category of Info:
Article
Info Source From:
Mining and Scientific Press. Volume: 96 [XCVI], Issue No. 2487; 12
Info Publication Date:
March 21, 1908
Info found on page:
397
Info Title:
Portland Cyanide Mill Precipitation Room Info Pieces
The precipitation room of the cyanide plant at the Portland mine, Colorado, contains 18 rows of zinc boxes, each row having six compartments 4 by 4 by 4 ft. and pyramidal in shape at the bottom. A 14-mesh wire screen supported by a 2-in. angle iron riveted on the inside, 20 in. above the lowest point of the pyramid forms the false bottom.
graphic for visual presentation of text These boxes are supported on timbers high enough above the cement floor to permit a man to stand up to work about them. The solution enters the first box through a false compartment, flows under the screen, then up through the zinc and over into the next compartment; 28 in. is the distance from the screen to the overflow of each compartment.
graphic for visual presentation of text A 12 by 12 in. wooden launder beneath each row of boxes carries the discharge to a launder of the same dimensions, which discharges into a steel vat with capacity for holding all of the solution from one row of zinc-boxes during a clean-up. It is connected to a 2-in. centrifugal pump which lifts the contents 30 ft. to a lead-lined tank. A hood having a 12 by 12-in. opening in the centre for the escaping fumes during a clean-up is built over the tank.
graphic for visual presentation of text Twelve sets of zinc-boxes are in use; each compartment is packed with 200 lb. of zinc shavings previously dipped in a 2% acetate of lead solution. Strong solution having 0.6 lb. cyanide per ton and a protective alkalinity 0.5 to 1.0 lb. flows through six rows of boxes, and a weak solution—the strength of cyanide per ton of solution being 0.3 to 0.4 lb. and protective alkalinity, neutral to 0.2 lb.—flows through the other six boxes.
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Type/Category of Info:
General Mining News
Info Source From:
The Mining World. Volume: 27 [XXVII], Issue No. 10
Info Publication Date:
September 7, 1907
Info found on page:
406
Info Title:
District Portland Mill Rumor
Denver—It was announced some time ago that the management of the Portland would erect a large plant at its mine, and while the work is not yet under way, it is very probable that a beginning will be made this fall.
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