Last updated: 4 May, 2019 21:54
Developments at Cripple Creek; Jan. 1903

The Engineering and Mining Journal,
January 17, 1903 (page 118)

Source text has no Image, so I used from my own collection.

From the numerous developments that have been made in the territory outside a circle, say, six miles in diameter, having the summit of Iron Clad Hill for its center, it would appear that no further extension of the ore-bearing district can be expected beyond the limits we now have.

Mining 1200 Feet Below the Surface.
Underground Scene, possible at the Portland Mine.

This does not mean that all the mines are already opened, for very large tracts of territory within this circle remain undeveloped, in some of which new mines will assuredly be opened up. We have certainly not reached the end of new discoveries within the district.

A large impetus in this direction will be given by opening the properties of the Stratton Mining and Development Company to lessees, which is now expected very shortly.

The main question remaining is that of the permanence of the mines, and of this, during the past year, we have received very promising evidence.

The deepest mines now being worked on the different hills are as follows:

Battle Mountain.
Portland, at 1,100 feet in the Burns shaft to 1,260 feet below surface at shaft No. 2.
1,000 feet
1,000 feet
900 feet
1,100 feet
800 feet
Bull Hill.
1,218 feet
1,371 feet
1,400 feet
1,500 feet
1,050 feet
900 feet
East Spur Bull Hill.
1,200 feet
1,510 feet
900 feet
A Cripple Creek Mine. Trolley Below the Portland Mine
Battle Moutain Scene below the Portland Mines.

All but one of these shafts have good bodies of ore and excellent indications for the future at the lowest levels to which they have thus far attained. Certain of these shafts, to wit, the Last Dollar and Blue Bird, show some of the richest ore ever mined in the district at their lowest levels. It has lately been asserted that this great enrichment of these veins is due to secondary deposit. By this is meant that the gold values have been largely leached from the upper portion of these veins and redeposited at a lower level, thereby enriching the original ore deposit of the vein by this amount.

A special feature of these rich ore-bodies at 1,200 and 1,300 feet below surface is the presence of copper, which is entirely absent from the upper or oxidized portion of the Cripple Creek veins. Another change in the mineral contents of the veins at the greatest depth thus far attained is the presence of lead, zinc and antimony in sulphide form and an increase in pyrites.


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