California State Mining Bureau · Sacramento : California State Mining Bureau · leaf 40
ore is deposited as the porousblack oxide, but often merely as stains and partial replacements alongcracks in the jasper. A few of the deposits were worked in the eighties and occasionalmining has been done since then. In 1917 and the first part of 1918under the stimulus of war conditions… … ALAMEDA COUNTY. 25 the cut mentioned above, as it appears to be driven too low and toofar to one side. A car load, about 50 tons, of ore was shipped in 1917and 1918 by Mr. Young on a royalty basis and there is at present (May,1919) about 15 tons of ore at the mine. The ore was hauled down theside…
Mines and mineral resources · Gold mines and mining · Mineralogy
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