Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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النتائج 1-5 من 98
الصفحة 14
... gravel or hydraulic mining , the estimated area of ground ( in acres ) now being worked , and the extent of the aurif- erous deposits ; an estimate of the yield of hydraulic ground , per cubic yard ; and a statement of the yield and ...
... gravel or hydraulic mining , the estimated area of ground ( in acres ) now being worked , and the extent of the aurif- erous deposits ; an estimate of the yield of hydraulic ground , per cubic yard ; and a statement of the yield and ...
الصفحة 15
... gravel , and the expense of treatment by mill process , at French Corral . I am also under obligations to Messrs . Cronise and Cross- man , and to Dr. Henry De Groot , of San Francisco ; also to Mr. Lyman Ackley , of Smartsville , Yuba ...
... gravel , and the expense of treatment by mill process , at French Corral . I am also under obligations to Messrs . Cronise and Cross- man , and to Dr. Henry De Groot , of San Francisco ; also to Mr. Lyman Ackley , of Smartsville , Yuba ...
الصفحة 20
... gravel being now washed and ore milled with satisfactory gains that would not a few years ago have paid working expenses . Hence the maintenance of such a high rate of pro- duction in the face of a drought almost unexampled for its long ...
... gravel being now washed and ore milled with satisfactory gains that would not a few years ago have paid working expenses . Hence the maintenance of such a high rate of pro- duction in the face of a drought almost unexampled for its long ...
الصفحة 25
... gravel deposits about La Grange , very little of which could heretofore be worked for want of water . Several important enterprises of this kind are also in progress in Yuba , Butte , and adjoining counties , besides numerous works ...
... gravel deposits about La Grange , very little of which could heretofore be worked for want of water . Several important enterprises of this kind are also in progress in Yuba , Butte , and adjoining counties , besides numerous works ...
الصفحة 26
... gravel , adding a novel and valuable feature to these deposits . So im- portant have these lower strata proved that they will cause more care- ful examinations to be made of the apparent bottoms of these auriferous channels hereafter ...
... gravel , adding a novel and valuable feature to these deposits . So im- portant have these lower strata proved that they will cause more care- ful examinations to be made of the apparent bottoms of these auriferous channels hereafter ...
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50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Cañon carbonate cent chemical claim coal commenced company's contains copper cost County course Creek Cupellation December deposits depth developed district ditch drift drill east El Dorado County engine erected Eureka expense extracted feet deep feet in length feet long feet wide furnace galena gangue gold Gold Hill gravel ground Gulch Hill hundred hydraulic inches incline iron labor lead ledge limestone located lode metallurgy metals miles mill miners Mining Company months nearly Nevada opened operations ounces owners placer mines pounds present Professor prospecting quantity quartz quartzite rich River rock San Francisco silver slag slate smelting smelting-works stamps stopes sulphurets sunk supply surface Table Mountain tailings thick tion tons Total tunnel Tuolumne County tuyeres Valley vein width yield