Professional Paper - United States Geological Survey, Edições 138-139The Survey, 1925 |
Termos e frases comuns
acid actinolite agent for Colorado assay average beds body Boulder bullion Burchard Burra Burra Canon City carbonate cent Chaffee chalcocite chalcopyrite claims Clear Creek Colo Colorado State Bureau Cripple Creek cyanide Denver deposits Ducktown Eagle fault figures folds Fremont furnace galena geologic Gilpin gold and silver gossan gray copper graywacke Gulch Gunnison Hill Hinsdale iron Lake County Leadville limestone located lode metals miles Montezuma Mountain northeast operated ounces of silver ounces silver Ouray Ouray County output oxide Park Pitkin placer placer mining plant Plata Polk County Pounds Value pyrite pyrrhotite quantity quartz railroad River rock Saguache San Juan San Miguel schist Secs shaft shipments shipped short tons silicates Silverton smelter smelting sphalerite staurolite stopes sulphide sulphuric Summit County surface Survey Mineral Resources Tennessee Copper Co total production tunnel U. S. Geol Value Pounds vein zinc
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Página 64 - Mining claims upon veins or lodes of quartz or other rock in place bearing gold, silver, cinnabar, lead, tin, copper, or other valuable deposits, heretofore located, shall be governed as to length along the vein or lode by the customs, regulations, and laws in force at the date of their location.
Página 64 - May, eighteen hundred and seventy-two, whether located by one or more persons, may equal, but shall not exceed, one thousand five hundred feet in length along the vein or lode; but no location of a mining claim shall be made until the discovery of the vein or lode within the limits of the claim located. No claim shall extend more than three hundred feet on each side of the middle of the vein at the surface, nor shall any claim be limited by any mining regulation to less than twenty-five feet on each...
Página 172 - Report of the Director of the Mint upon the Production of the Precious Metals in the United States during the Calendar Year, 1905.
Página xxiii - Remarks on the changes which take place in the structure and composition of mineral veins near the surface, with particular reference to the East Tennessee Copper Mines.
Página 64 - In length along the vein or lode ; but no location of a mining claim shall be made until the discovery of the vein or lode COST.MIN.LI. (539) within the limits of the claim located.
Página 262 - LA.FORGE, LAURENCE, and PHALEN, WC, US Geol. Survey Geol. Atlas, Ellijay folio (No. 187), 1913. The Ellijay quadrangle includes the southern part of the Ducktown district, and the rocks and types of geologic structure are similar. The text of the folio includes a discussion of the stratigraphy of the region.
Página 64 - ... at the date of their location. A mining claim located after the tenth day of May, eighteen hundred and seventy-two, whether located by one or more persons, may equal, but shall not exceed, one thousand five hundred feet in length along the vein or lode but no location of a mining claim shall be made until the discovery of the vein or lode within the limits of the claim located. No claim...
Página 47 - Beneath the gossan is found a bed or mass of black cupriferous ore of variable thickness and width. This, as well as the gossan, is the result of the decomposition of an ore consisting originally of a mixture of the sulphurets of iron and copper which was associated with a quartzose gangue or vein stone.
Página 218 - Mill made i short run in the summer, but was unsuccessful. The Saint Lawrence Mill has been transported to Georgetown and sold to the Pelican Company. The operations of the Boston Silver Company, at Saint John's, have been steadily prosecuted during the season. The company continued to drive its long tunnel into Glacier Mountain until, on the 20th of November, it had reached a length of 1,075 feet. It is well constructed throughout, being 7 feet wide by 9 feet high, and in all places, where the rock...
Página 120 - ... needed by the Malta Works as a flux. The ore in the western branches of the two splits is decidedly softer than that in the eastern ones, but so far it has not shown any such rich pockets as the eastern upper branch between the line and the main, shaft. The eastern lower branch between the line and the lower shaft has so far not been developed. At the lowest depth, just before the rich pyrites was struck, the contents of the ore in gold were very small. At the same time it must be remarked that...