Detailed/More Info:
Portland Mill {aka Victor Mill; On Battle Mountain]
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Info Database Last Updated 13.12.2021 (Entity News entries: 23)
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:
Abstracted from a somewhat longer text about Cyaniding Cripple Creek Dumps.
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 22.03.2019

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:
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.
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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 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:
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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.
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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 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:
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:
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:
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?].
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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:
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.
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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 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.
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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:
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
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Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 21.10.2019

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. 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
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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. 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:
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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:
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. 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
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 11.11.2019

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. 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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Abstracted and somewhat rewritten slightly
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 18.11.2019

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
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 26.01.2020

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:
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:
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