Silver and Gold: An Account of the Mining and Metallurgical Industries of the United States |
Dari dalam buku
Hasil 1-5 dari 89
Halaman 27
... surface toward the edges . The diamond , moreover , is extremely hard , and scratches quartz with the greatest ease . If , therefore , any one finds a little white or yellowish white crystal with twenty - four of these curved triangular ...
... surface toward the edges . The diamond , moreover , is extremely hard , and scratches quartz with the greatest ease . If , therefore , any one finds a little white or yellowish white crystal with twenty - four of these curved triangular ...
Halaman 42
... consists in boring a large number of holes from the surface to the full depth of the proposed shaft , unless this is too great . Three hundred feet is the depth of the holes in the 42 MINING STATISTICS WEST OF THE ROCKY MOUNTAINS .
... consists in boring a large number of holes from the surface to the full depth of the proposed shaft , unless this is too great . Three hundred feet is the depth of the holes in the 42 MINING STATISTICS WEST OF THE ROCKY MOUNTAINS .
Halaman 47
... surface . This class is known as " pocket- veins . " Although many so - called pocket - veins exist near to and parallel with the Mother lode , as at Angel's Camp , Calaveras County , where this class of mining is extensively carried on ...
... surface . This class is known as " pocket- veins . " Although many so - called pocket - veins exist near to and parallel with the Mother lode , as at Angel's Camp , Calaveras County , where this class of mining is extensively carried on ...
Halaman 49
... surface , and to an indefinite depth , by " horse " matter , composed of nearly equal parts of slate and broken quartz . Locations have been made in the majority of such in- stances on the croppings , parallel to each other , one on the ...
... surface , and to an indefinite depth , by " horse " matter , composed of nearly equal parts of slate and broken quartz . Locations have been made in the majority of such in- stances on the croppings , parallel to each other , one on the ...
Halaman 52
... surface remains very nearly at the level and with the form which it originally had at the time of its consolidation , while its edges and the surrounding country have been denuded and washed away , so that the topography of the region ...
... surface remains very nearly at the level and with the form which it originally had at the time of its consolidation , while its edges and the surrounding country have been denuded and washed away , so that the topography of the region ...
Edisi yang lain - Lihat semua
Istilah dan frasa umum
50 feet amalgam amount antimony arrastra assay average Bannack base bullion bed-rock bullion Calaveras County California CaƱon 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