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 33
... Mill and the signing of the treaty . It is claimed that the knowledge of the discovery was not known to the Mexicans , while the Amer- ican officials affected ignorance . The following extract from an unofficial letter written on March ...
... Mill and the signing of the treaty . It is claimed that the knowledge of the discovery was not known to the Mexicans , while the Amer- ican officials affected ignorance . The following extract from an unofficial letter written on March ...
Stran 50
... mills erected in the vicinity of Prescott were either upon worthless lodes or upon those in which ores predominate which ... mill is in process of erection at Apache Pass , where the gold lodes are attracting much attention and give ...
... mills erected in the vicinity of Prescott were either upon worthless lodes or upon those in which ores predominate which ... mill is in process of erection at Apache Pass , where the gold lodes are attracting much attention and give ...
Stran 55
... mill was not sufficiently deep he had hit upon the plan of cutting the excavation deeper by the action of running water , accomplished in this case by turning on a full head of water from the mill - pond by simply raising the gate ...
... mill was not sufficiently deep he had hit upon the plan of cutting the excavation deeper by the action of running water , accomplished in this case by turning on a full head of water from the mill - pond by simply raising the gate ...
Stran 56
... mill at the time of the discovery , left for San Francisco about the middle of February , taking with him some of the gold . There he met Isaac Humphrey , who had worked in the Georgia gold mines ; he at once pronounced it gold and ...
... mill at the time of the discovery , left for San Francisco about the middle of February , taking with him some of the gold . There he met Isaac Humphrey , who had worked in the Georgia gold mines ; he at once pronounced it gold and ...
Stran 72
... mill was built at the Shingleton mine in 1866 , by Dr. Hamilton . The chlorination process was experimented with at Dahlonega , and the Clopton mine , Villa Rica ; at the former some years ago , at the latter recently . In 1892 ...
... mill was built at the Shingleton mine in 1866 , by Dr. Hamilton . The chlorination process was experimented with at Dahlonega , and the Clopton mine , Villa Rica ; at the former some years ago , at the latter recently . In 1892 ...
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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