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 100
Stran 4
... known as the " Chinook jargon . " The Chinook language was spreading rapidly , but was checked and almost wholly wiped out by the influx of more educated people drawn thither by the discovery of gold.1 It can be claimed for mining that ...
... known as the " Chinook jargon . " The Chinook language was spreading rapidly , but was checked and almost wholly wiped out by the influx of more educated people drawn thither by the discovery of gold.1 It can be claimed for mining that ...
Stran 21
... known localities . However , it is known that they prized copper as highly as they did gold , and it is possible that the two metals were thought of and spoken of by them in such terms as to confuse their inquirers . According to Mr ...
... known localities . However , it is known that they prized copper as highly as they did gold , and it is possible that the two metals were thought of and spoken of by them in such terms as to confuse their inquirers . According to Mr ...
Stran 23
... known prior to the advent of the Amer- ican miner . Evidence exists that the gravels were worked intelli- gently . Extensive gravel workings seem to have been conducted at Gold Run , for in 1900 a fairly well made stone wall was encoun ...
... known prior to the advent of the Amer- ican miner . Evidence exists that the gravels were worked intelli- gently . Extensive gravel workings seem to have been conducted at Gold Run , for in 1900 a fairly well made stone wall was encoun ...
Stran 24
... known to the ancestors of the present Indians ; when and why they left these shores is idle to conjecture , but it was probably at least four hundred years ago . If this is true there is little wonder that traditions are scarce and ...
... known to the ancestors of the present Indians ; when and why they left these shores is idle to conjecture , but it was probably at least four hundred years ago . If this is true there is little wonder that traditions are scarce and ...
Stran 25
... known to exist and usually lie in this bordering zone . Masses of native copper with pieces of native silver attached have been found in the mounds of the Mississippi valley , which would . seem to indicate that the Indians were not ...
... known to exist and usually lie in this bordering zone . Masses of native copper with pieces of native silver attached have been found in the mounds of the Mississippi valley , which would . seem to indicate that the Indians were not ...
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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