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 53
Stran 69
... tunnel proved conclusively that all of the mines of the district , with the excep- tion of a few on the east side , are more or less connected by water channels . The most important discovery of the year was that of the Old Gold on ...
... tunnel proved conclusively that all of the mines of the district , with the excep- tion of a few on the east side , are more or less connected by water channels . The most important discovery of the year was that of the Old Gold on ...
Stran 130
... tunnel , tapping the Comstock lode , was begun on October 19 . Silver deposits were discovered at Pioche , Nevada . Copper - silver ore was discovered at Butte , Montana , and a smelt- ing furnace was erected at the Parrot mine . The ...
... tunnel , tapping the Comstock lode , was begun on October 19 . Silver deposits were discovered at Pioche , Nevada . Copper - silver ore was discovered at Butte , Montana , and a smelt- ing furnace was erected at the Parrot mine . The ...
Stran 143
... tunnel was began in the Cripple Creek district , Colorado . The United States lost first place in the production of gold , its product being exceeded by $ 290,670 by Australia . The Mount Pisgah excitement at Cripple Creek occurred in ...
... tunnel was began in the Cripple Creek district , Colorado . The United States lost first place in the production of gold , its product being exceeded by $ 290,670 by Australia . The Mount Pisgah excitement at Cripple Creek occurred in ...
Stran 144
... tunnel at Cripple Creek , Colorado , was begun . The Klondike district , British Territory , was discovered , and a mad rush commenced in August . There was an increase in the gold and silver production in Oregon , due to the Baker City ...
... tunnel at Cripple Creek , Colorado , was begun . The Klondike district , British Territory , was discovered , and a mad rush commenced in August . There was an increase in the gold and silver production in Oregon , due to the Baker City ...
Stran 270
... TUNNEL EVER GREEN MAYFLOWER COPPER CULCH YOSEMITE WZO AHOGANY GULCH MAM PINE GULCH DALTON • YOSEMITE BROOKLYNG BROOKLYN GULCH TTERFIELD CANKO RICHMOND PLAINS VALLEY PART OF SALT LAKE JORDAN TO RIO GRANDE WE MINES AND MINERALS . Bingham ...
... TUNNEL EVER GREEN MAYFLOWER COPPER CULCH YOSEMITE WZO AHOGANY GULCH MAM PINE GULCH DALTON • YOSEMITE BROOKLYNG BROOKLYN GULCH TTERFIELD CANKO RICHMOND PLAINS VALLEY PART OF SALT LAKE JORDAN TO RIO GRANDE WE MINES AND MINERALS . Bingham ...
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Alaska amalgamation andesite argentiferous assay auriferous average bed-rock blende calcite California Carolina cent chalcopyrite chlorination Colorado Comstock lode 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 gold and silver gold production gold-bearing granite gravel gray copper Gulch Hill hydraulic Ibid Idaho igneous rocks inches iron Jour lead limestone located mercury method Mexico mill Mineral Industry Mineral Resources Mines and Minerals Montana Mountain Nevada North North Carolina occur operations ore-bodies ounces output oxide placer mines placers porphyry precious metals Press probably production of gold pyrite quantities quartz quartz-veins Rept River roasting rocks schists shaft silver production Silver-bearing slate sluices smelting solution South stamps stope sulphides sulphurets surface TABLE tellurides tellurium tetrahedrite timber tion tons Total tunnel usually Utah veins width yield zinc