The structural and industrial materials of California (1906)
Aubury, Lewis E., b. 1862 · Sacramento, W.W. Shannon, Superintendent State printing · leaf 158
d for the waste product. Thequarry opening on the north side of the canon has heen abandoned.On the south side of the canon the quarry 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… … ILL. No. i;y. ELREKA SLATE IHAKKY, SLATIN(;T(.)N, EL DORADO COUNTY. feet of the bottom of the canon. From both places large quantities ofgood roofing 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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