The quicksilver resources of California . PHOTO No. 21. ENTRANCE—CASTELT-A DEVELOPMENT TUNNEL, INTEGRAL MINE. An exposure of croppings is found on this mining claim in theroad between the Altoona and Integral mines. Integral Mine.—This is in Sees. 14, 15, 21, 22, 23, 27, and 28,T. 38 N., R. 6 \V., and consists of forty-six mining claims andseveral timber sections. The Integral Mining Company,owner; E. W. McGraw, 324 Pine street, San Francisco; FrankA. Mahon, superintendent, Integral, Trinity County. Thegeology of this property is treated previously in the generaldescription of this district. S
The quicksilver resources of California . PHOTO No. 21. ENTRANCE—CASTELT-A DEVELOPMENT TUNNEL, INTEGRAL MINE. An exposure of croppings is found on this mining claim in theroad between the Altoona and Integral mines. Integral Mine.—This is in Sees. 14, 15, 21, 22, 23, 27, and 28,T. 38 N., R. 6 \V., and consists of forty-six mining claims andseveral timber sections. The Integral Mining Company,owner; E. W. McGraw, 324 Pine street, San Francisco; FrankA. Mahon, superintendent, Integral, Trinity County. Thegeology of this property is treated previously in the generaldescription of this district. Some croppings are found between 194 QUICKSILVER RESOURCES OF CALIFORNIA. the mouth of the Castella tunnel and the sawmill, but no orebodies have been cut by this tunnel. Serpentine is also under-ground the principal country rock. In this serpentine liesa body of highly altered rock, probably an altered feldspar-. Verr/ca/W/nze b^fween 40a 80/e/eL Probab/e /imifs of porphyry on SO/ei/el. •• • ••/20 ••Serpentine. „, , freo)Blacksmifhshop Fig. 62a. Underground workings of Integral Mine. porphyr>% as far as ascertained in the form of an irregularlens, with a northwesterly dip. In the parts of the lens whichcarry ores the material is thoroughly decomposed by the actionof the mineral-bearing waters, which deposited there in ironand mercury sulphides, the former being largely, if not entirely TRINITY AND OTHER COUNTIES. 195 weathered into iron oxides, decomposing the gangue rock andgiving it a yellow and black color. The principal system of underground works consist of ashaft, from which four levels, respectively 40, 80, 120, and 180feet below its collar have been driven, and an intermediatelevel at lOO feet. [See Fig. 62a.] The 180-foot level connectsthrough a vertical winze with the Castella development tunnel,which is 120 feet vertical lower; and from this winze a driftand side
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
