 | 1903 - 988 Seiten
...in the district, consists in its lower levels of a mass of angular rubbish, derived from the walls of the fissure, and in places cemented by quartz,...dip of the vein. The ores consist of sulphides and snlpliaiitimonidcs uf silver, with gold aggregating (io per cent of the total value. In the upper levels... | |
 | Samuel Franklin Emmons - 1903 - 462 Seiten
...in the district, consists in its lower levels of a mass of angular rubbish, derived from the walls of the fissure, and in places cemented by quartz,...sulphantimonides of silver, with gold aggregating (50 per cent of the total value. In the upper levels the ore is somewhat oxidized, and in the ore shoots... | |
 | Geological Survey (U.S.) - 1903 - 464 Seiten
...in the district, consists in its lower levels of a mass of angular rubbish, derived from the walls of the fissure, and in places cemented by quartz,...dip of the vein. The ores consist of sulphides and sulphantimouides of silver, with gold aggregating i»0 per cent of the total value. In the upper levels... | |
 | Joseph Barrell - 1907 - 242 Seiten
...in the district, consists in its lower levels of a mass of angular rubbish, derived from the walls of the fissure, and in places cemented by quartz,...sulphides and sulphantimonides of silver, with gold aggregating'60 per cent of the total value. In the upper levels the ore ia somewhat oxidized and in... | |
 | Ulysses Sherman Grant, Daniel F. Higgins - 1913 - 800 Seiten
...to a depth of 1,600 feet, but no ore was found below the 1 ,000-foot level. According to Weed3 — In general, it may be said that all the veins of the...matter barren and unworkable. The pitch of the ore eho';ts conforms to the usual habit, dipping to the right when looking down the dip of the vein. The... | |
 | William Harvey Emmons - 1913 - 274 Seiten
...below the 1,000-foot level. According to Weed2 — In general, it may be said that all the veins of tho district carry rich ores in bonanzas and ore shoots...matter barren and unworkable. The pitch of the ore shouts conforms to the usual habit, dipping to the right when looking down the dip of the vein. The... | |
 | 1914 - 1346 Seiten
...fissure, and in places cemented by quartz, in other places still retaining its original character. It may also be said that the ore shoots were well...right when looking down the dip of the vein. " The walls are usually indistinct in the productive parts of the lode, but in the barren portions they are... | |
 | 1914 - 1444 Seiten
...fissure, and in places cemented by quartz, in other places still retaining its original character. . It may also be said that the ore shoots were well defined the intervening vein matter barren and unworkable. The pitch of "^Vie ore shoots conforms to the usual... | |
 | American Institute of Mining, Metallurgical, and Petroleum Engineers - 1915 - 878 Seiten
...fissure, and in places cemented by quartz, in other places still retaining its original character. . . . . It may also be said that the ore shoots were well...right when looking down the dip of the vein. " The walls are usually indistinct in the productive parts of the lode, but in the barren portions they are... | |
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In general it may be said that all the veins of the district carry rich ores in bonanzas and ore shoots within the first 200 feet from the surface, but that in depth the ores rapidly decrease in value until the vein is no longer workable. It may also... 