Gold and Silver: Comprising an Economic History of Mining in the United States, the Geographical and Geological Occurrence of the Precious Metals, with Their Mineralogical Associations, History and Description of Methods of Mining and Extraction of Values, and a Detailed Discussion of the Production of Gold and Silver in the World and the United StatesJ. Wiley & Sons, 1908 - 727 strani |
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Zadetki 1–5 od 99
Stran 22
... consisting of thirty - four small cabins . . . , above these little houses . . . trees were growing from two to three feet in diameter . The estimated age of these trees was somewhat over two hundred years . In Valley - River Valley ...
... consisting of thirty - four small cabins . . . , above these little houses . . . trees were growing from two to three feet in diameter . The estimated age of these trees was somewhat over two hundred years . In Valley - River Valley ...
Stran 72
... consisting of gulches , bars , and flats . This was at the head of the Clearwater River . A small area about two 1 T. A. I. M. E. , Vol . 25 , p . 804 and Mining Magazine , Vol . 1 , pp . 360–370 . ' Mineral Industry for 1892 to 1906 ...
... consisting of gulches , bars , and flats . This was at the head of the Clearwater River . A small area about two 1 T. A. I. M. E. , Vol . 25 , p . 804 and Mining Magazine , Vol . 1 , pp . 360–370 . ' Mineral Industry for 1892 to 1906 ...
Stran 112
... consists of six claims , of which three are given above , the others being the Mountain Lion Fraction , Navahoe and Zeta . In 1881 , the mining operations were practically confined to Yokima , Peshastin district , and Spokane counties ...
... consists of six claims , of which three are given above , the others being the Mountain Lion Fraction , Navahoe and Zeta . In 1881 , the mining operations were practically confined to Yokima , Peshastin district , and Spokane counties ...
Stran 165
... consists of a hydro - mica schist cut by many veins and lenses of quartz . The granites of California are often gold - bearing , but owe their values to neighboring veins . In Calaveras County , California , gold has been found in beds ...
... consists of a hydro - mica schist cut by many veins and lenses of quartz . The granites of California are often gold - bearing , but owe their values to neighboring veins . In Calaveras County , California , gold has been found in beds ...
Stran 173
... consist of decomposed schist or gneiss . At the surface the gold is practically all free - milling , but with depth ... consisting principally of placer diggings , but later quartz - veins and pockets have been opened up . The deposits ...
... consist of decomposed schist or gneiss . At the surface the gold is practically all free - milling , but with depth ... consisting principally of placer diggings , but later quartz - veins and pockets have been opened up . The deposits ...
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende bornite calcite California Carolina cent chalcopyrite chloride chlorination Colorado Comstock lode concentration considerable copper country-rock County Cripple Creek cyanide cyanide process Deep Mines deposits depth diorite discovered discovery district dollars drift employed extraction feet free-gold furnace galena gangue gneiss gold and silver gold production Gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite pyrrhotite quantities quartz quartz-veins quartzites Rept rhyolite River rocks schists shaft siliceous silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel Utah yield zinc