File:Bulletin (1905) (14592964430).jpg

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Identifier: bulletin78cali (find matches)
Title: Bulletin
Year: 1905 (1900s)
Authors: California. Division of Mines and Geology California. State Mining Bureau. Bulletin
Subjects: Mines and mineral resources Geology
Publisher: San Francisco (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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kV.f.C. QUICKSILVER RESOURCES. Ill noted is not ore. The ore occurrences are not altogether regular.There are various veins, cross-veins, stock-works and impregnations.The main ore-body within the area is stock-works in sandstone andshale, and in places an impregnated sandstone, somewliat harder thanthe others. As will be noted from the map (Plate XII), the mine is inthe Franciscan metamorphie sandstones and shales and some distance
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Photo No. 22. Flashlight view in square set stope (30 wide) betweenNo. 2 and No. 2li, levels, New Idria Mine. from the contact of the large serpentine area already mentioned.Some of the shale is indurated so that it resembles slate, and was socalled in some of the earlier reports. The hanging wall is marked bya black clay alta outside of which is metamorphosed shale, then sand-stone and finally serpentine beyond. The footwall is not as distinctlydefined as the hanging, the value frequently not showing a sharp stop-ping ofl; line. )12 CALIFORNIA STATE MINING BUREAU. The mine workings are complicated and numerous, due to the irreg-ularity of the ore shoots. Considerable timbering is required,especially in the larger stopes, where the square set system is employed(see Photo No. 22). The stope shown is 5 sets (6 feet each) wide, or30 feet. Others are up to 50 feet square. The two more importantore shoots developed are at opposite ends of the zone. The Bodieshoot is at the east end, the ot

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78
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29 July 2014



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