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 15
... prospecting been pushed so far , nor been attended with such happy results , as during the past few years . From Mexico to Alaska important discoveries are announced , while the opening up of one rich district seems only to point to ...
... prospecting been pushed so far , nor been attended with such happy results , as during the past few years . From Mexico to Alaska important discoveries are announced , while the opening up of one rich district seems only to point to ...
الصفحة 42
... prospecting purposes , or in boring for water . Some details of its operations in running tunnels will be found in this report , where oper- ations at Smartsville , Yuba County , are described . During the publication of this report a ...
... prospecting purposes , or in boring for water . Some details of its operations in running tunnels will be found in this report , where oper- ations at Smartsville , Yuba County , are described . During the publication of this report a ...
الصفحة 69
... prospecting resumed pany . this year ; mine valuable , but will require a large expenditure to put it in paying condition . Running at intervals . Jones & Woodman . Bosworth & Co .... Heslep Mine and Mill .. 15 B. F. Heslep .. Preston's ...
... prospecting resumed pany . this year ; mine valuable , but will require a large expenditure to put it in paying condition . Running at intervals . Jones & Woodman . Bosworth & Co .... Heslep Mine and Mill .. 15 B. F. Heslep .. Preston's ...
الصفحة 80
... prospecting the lead has proved the existence of three auriferous " chimneys , " known as the north , middle , and south chimneys . The latter has been " stoped " out to the depth of 126 feet , the quartz extracted , good , bad , and in ...
... prospecting the lead has proved the existence of three auriferous " chimneys , " known as the north , middle , and south chimneys . The latter has been " stoped " out to the depth of 126 feet , the quartz extracted , good , bad , and in ...
الصفحة 85
... prospecting - level in the mine . At present , the vein measures twelve feet in width , and yields an average of about $ 10 per ton . Although " Panama " level is some 150 feet below the level of the sea , it is proposed to sink 200 ...
... prospecting - level in the mine . At present , the vein measures twelve feet in width , and yields an average of about $ 10 per ton . Although " Panama " level is some 150 feet below the level of the sea , it is proposed to sink 200 ...
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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