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" The place of the bed of copper ore marks the limit of the decomposition of the vein ; beneath It the ore exists in its original condition. The depth at which the gossan terminates is nearly coincident with the water level or the point where, In sinking,... "
The Enrichment of Ore Deposits - Page 13
by William Harvey Emmons - 1917 - 530 pages
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American Journal of Science and Arts, Volumes 61-70

Science - 1855 - 490 pages
...of the sul phurets of iron and copper, which was associated with a quartzose gangue or vein-stone. The place of the bed of copper ore marks the limit...the decomposition of the vein ; beneath it the ore crisis in its original condition." It seems hardly possible that any one should ever have supposed...
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Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy & C

1853 - 688 pages
...which was associated with a quartzon gangue or vein-stone. The place of the bed of copper ore mark* the limit of the decomposition of the vein ; beneath it the ore exists in SECTION OF THI VI1K. (a) Ootian. (b) Black Copper Ore. (c) Undecompoted Vein, (d) Mica State. its original...
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The Metallic Wealth of the United States: Described and Compared with that ...

Josiah Dwight Whitney - Technology & Engineering - 1854 - 556 pages
...originally of a mixture of the sulphurets of iron and copper, which were associated with a quartzose gangue. The place of the bed of copper ore marks the limit...the ore exists in its original condition. The depth to which decomposition has extended is variable, and identical nearly with the level at which water...
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The Metallic Wealth of the United States: Described and Compared with that ...

Josiah Dwight Whitney - Mines and mineral resources - 1854 - 554 pages
...originally of a mixture of the sulphurets of iron and copper, which were associated with a quartzose gangue. The place of the bed of copper ore marks the limit...the ore exists in its original condition. The depth to which decomposition has extended is variable, and identical nearly with the level at which water...
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The Metallic Wealth of the United States: Described and Compared with that ...

Josiah Dwight Whitney - Mines and mineral resources - 1854 - 564 pages
...sulphurets of iron and copper, which were associated with a quartzose gangue. The place of the hed of copper ore marks the limit of the decomposition...the ore exists in its original condition. The depth to which decomposition has extended is variable, and identical nearly with the level at which water...
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Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy & C

1855 - 570 pages
...nature of the vein is perceived. In the valleys the distance required for this purpose is much less. The depth at which the gossan terminates is nearly coincident with the water-level, or the point where, in sinking, water is found in considerable quantity. Here a layer...
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Professional Paper - United States Geological Survey, Issues 138-139

Geological Survey (U.S.) - Geology - 1925 - 488 pages
...mixture of the sulphurets of iron and copper which was associated with a quartzose gangue or veinstone. The place of the bed of copper ore marks the limit...sinking, water is found in considerable quantity. The deposit of black ore is insignificant in dimensions, compared with the mass of gossan which overlies...
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