Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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الصفحة 44
... length , from one foot to six feet or more . This small size enables it to be used in any tunnel , shaft , or place in a mine where a miner can enter , and is so arranged that it will bore a hole in any direction . It can be put in ...
... length , from one foot to six feet or more . This small size enables it to be used in any tunnel , shaft , or place in a mine where a miner can enter , and is so arranged that it will bore a hole in any direction . It can be put in ...
الصفحة 49
... feet ; but recent deep developments at various points would seem to indicate a tendency of these walls to narrow ... length of locations made on the Mother lode is estimated at 180,000 feet , equal to half the distance between its ...
... feet ; but recent deep developments at various points would seem to indicate a tendency of these walls to narrow ... length of locations made on the Mother lode is estimated at 180,000 feet , equal to half the distance between its ...
الصفحة 52
... feet , and a thickness of about 150 feet ; its elevation at Jamestown is about 500 feet above the surround- ing ... length of the mountain was located , and hundreds of tunnels run to strike the channel . From the best data at our disposal we ...
... feet , and a thickness of about 150 feet ; its elevation at Jamestown is about 500 feet above the surround- ing ... length of the mountain was located , and hundreds of tunnels run to strike the channel . From the best data at our disposal we ...
الصفحة 54
... feet in length on the Table Mountain channel ; the " flat " being on the eastern side of Table Mountain , and their location running down on the western side of the lava - covered mountain toward the Stanislaus River . They are now ...
... feet in length on the Table Mountain channel ; the " flat " being on the eastern side of Table Mountain , and their location running down on the western side of the lava - covered mountain toward the Stanislaus River . They are now ...
الصفحة 55
... feet square yielded $ 100,000 , and that the total product of the flat was ... length in this report . Near San Andreas , Calaveras County , and in the ... feet , imbedded in a stratum of gravel five feet in thickness . The ...
... feet square yielded $ 100,000 , and that the total product of the flat was ... length in this report . Near San Andreas , Calaveras County , and in the ... feet , imbedded in a stratum of gravel five feet in thickness . The ...
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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