The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 158
the waste product. The(juarry opening on the north side of the canon has been abandoned.On the south side of the canon the (juarry has a face over 200 feet long,and about 70 feet high at one end, and about 200 feet at the other. Thewest end of the quarry has been sunk 90 feet below the bottom ofthe… … ILL. No. (ly. ETREKA SLATE CHARRV, SLATLNGTo.N. EL DORADO ColNTY. feet of the l)ottom of the canon. From both places large quantities ofgood rooting slate are quarried. The strike of the cleavage is south 25 degrees east. To a depth ofnearly 40 feet in places, there are numerous joint-planes…
Building stones · Portland cement · Clay · Mines and mineral resources
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