Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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الصفحة 23
... sunk at the outer extremity of the works in deep water , and excava- tions will be made until the bed - rock of the bay is reached , when a huge chimney will be erected on it , and uprear its lofty , smoking top from out the waters far ...
... sunk at the outer extremity of the works in deep water , and excava- tions will be made until the bed - rock of the bay is reached , when a huge chimney will be erected on it , and uprear its lofty , smoking top from out the waters far ...
الصفحة 49
... sunk , and levels opened to a depth of 1,300 feet . The entire length of locations made on the Mother lode is estimated at 180,000 feet , equal to half the distance between its northern and southern extremity . Many of these locations ...
... sunk , and levels opened to a depth of 1,300 feet . The entire length of locations made on the Mother lode is estimated at 180,000 feet , equal to half the distance between its northern and southern extremity . Many of these locations ...
الصفحة 50
... sunk and hoisting - works and pumping - machinery erected , the owners of the ground having com- mitted the common error of failing to keep their ground developed in advance of their milling capacity . Perhaps a third reason may be ...
... sunk and hoisting - works and pumping - machinery erected , the owners of the ground having com- mitted the common error of failing to keep their ground developed in advance of their milling capacity . Perhaps a third reason may be ...
الصفحة 51
... sunk , will have a tendency to open more than fifty claims in the same vicinity . Gravel mining . - The gold - bearing gravel deposits of the southern mines are not as extensive in area and depth as those of the central mining region ...
... sunk , will have a tendency to open more than fifty claims in the same vicinity . Gravel mining . - The gold - bearing gravel deposits of the southern mines are not as extensive in area and depth as those of the central mining region ...
الصفحة 54
... sunk in the flat , near the line of the lava , to a depth of eighty feet , when a large quantity of water was encountered , of such volume as to resist the power of the best pumping machinery then in use . About the year 1855 or 1856 ...
... sunk in the flat , near the line of the lava , to a depth of eighty feet , when a large quantity of water was encountered , of such volume as to resist the power of the best pumping machinery then in use . About the year 1855 or 1856 ...
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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