Silver and Gold: an Account of the Mining and Metallurgical Industry of the United States: With Reference Chiefly to the Precious MetalsJ.B. Ford, 1873 - 566 من الصفحات |
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الصفحة 93
... gangue " being often a putty - like kaolin , but more frequently a harder rock of the same character . When concentrated , the ore assays from $ 1,000 to $ 3,000 per ton ; but , as it comes from the mine , ranges from $ 50 to $ 200 ...
... gangue " being often a putty - like kaolin , but more frequently a harder rock of the same character . When concentrated , the ore assays from $ 1,000 to $ 3,000 per ton ; but , as it comes from the mine , ranges from $ 50 to $ 200 ...
الصفحة 200
... gangue in this vein is principally quartz , intermixed with a small quantity of calc - spar . The ore is mostly silver - copper glance or stromeyerite , but black sulphurets , horn - silver , and some native silver occur also . The ...
... gangue in this vein is principally quartz , intermixed with a small quantity of calc - spar . The ore is mostly silver - copper glance or stromeyerite , but black sulphurets , horn - silver , and some native silver occur also . The ...
الصفحة 201
... gangue . Some of the ore is very rich in silver , and assays of it run high into the thousands . One ton of ore worked at the Big Smoky Mill yielded $ 395 per ton , but the average of the vein is probably not over $ 50 , and not over ...
... gangue . Some of the ore is very rich in silver , and assays of it run high into the thousands . One ton of ore worked at the Big Smoky Mill yielded $ 395 per ton , but the average of the vein is probably not over $ 50 , and not over ...
الصفحة 203
... gangue containing the ore is a sandy quartz . The ore contains considerable lead . The length of the ore - body on the surface is 200 feet . Eight tons worked at the Big Smoky Mill yielded from $ 141 to $ 278 per ton . One hundred tons ...
... gangue containing the ore is a sandy quartz . The ore contains considerable lead . The length of the ore - body on the surface is 200 feet . Eight tons worked at the Big Smoky Mill yielded from $ 141 to $ 278 per ton . One hundred tons ...
الصفحة 211
... gangue is quartz , and the ore is principally fahlerz and argentif- erous zinc - blende . The first - class ore , comprising apparently about 5 per cent . of the whole , is worth from three hundred to five hundred dollars per ton . The ...
... gangue is quartz , and the ore is principally fahlerz and argentif- erous zinc - blende . The first - class ore , comprising apparently about 5 per cent . of the whole , is worth from three hundred to five hundred dollars per ton . 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