Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
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Halaman 13
... obtained through their observation and investigatiou in their respective districts . In 1869 , a set of blanks , five in number , embracing under appropriate headings the class of information desired , were sent by mail and express to ...
... obtained through their observation and investigatiou in their respective districts . In 1869 , a set of blanks , five in number , embracing under appropriate headings the class of information desired , were sent by mail and express to ...
Halaman 16
... obtained for supplying them . Indeed , a good degree of development is insisted upon as a condition - precedent to con- sidering the question of erecting reduction - works , while in most of our large mines extensive deposits are held ...
... obtained for supplying them . Indeed , a good degree of development is insisted upon as a condition - precedent to con- sidering the question of erecting reduction - works , while in most of our large mines extensive deposits are held ...
Halaman 18
... obtained , and again mix them . Again spread out , say , one inch thick , laid out into 4 - inch squares , taking a smaller portion from each . Reduce this sample to powder ; if too much for average assays , sample again as before . Get ...
... obtained , and again mix them . Again spread out , say , one inch thick , laid out into 4 - inch squares , taking a smaller portion from each . Reduce this sample to powder ; if too much for average assays , sample again as before . Get ...
Halaman 19
... obtain the gold of this fineness , without minute reduction ? Therein lies the secret of high assays before working ... obtained in the Old World and the rules laid down in the books could not be applied here to advantage . The high ...
... obtain the gold of this fineness , without minute reduction ? Therein lies the secret of high assays before working ... obtained in the Old World and the rules laid down in the books could not be applied here to advantage . The high ...
Halaman 23
... obtained by our mercantile and trading community , which reflects upon all other classes . Some of the hydraulic workings in this State , though carried on mostly by single individuals or small companies , are really enterprises of ...
... obtained by our mercantile and trading community , which reflects upon all other classes . Some of the hydraulic workings in this State , though carried on mostly by single individuals or small companies , are really enterprises of ...
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Istilah dan frasa umum
50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California Caņon 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