MINEBK00806

• County: Pitkin
• Volume: 8
• Document: Inspectr
• Suffix: A

GEOLOGY. ~- ... _ 3
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ing' There is a good geologicnl survey of the district published by Spurr
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n' of the U.S.C.S. '
lue ,The Pioneer tunnel after passim; through n slight thickness of glacial
drift goes through 330 ft.of sha]r.~50fFt.of porphyry and '1.30 ft.of shale
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,then crosses into the blue limesT.oneof which there is about 75 ft, to
the Saddle Rock fault and crosses this fault into.the granite.
;The Galena tunnel starts in t}ie dolomite betereen Saddle Rock and Pride
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', faults~thener, south westerly far 2S0 ft.t.o contact between dolomite
and granite caused by Pride fault. See Spurr pages 1f,0-C1
;The Durns shaft is sun}; cntirr.ly in the quartz porphyry tl:cnce cross-
cutting to south west to fault.