The Examination of Prospects; a Mining Geology
The Examination of Prospects; a Mining Geology
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The main slate band is 200 ft. In thickness, and the several veins carry ore where they pass through it, but are elsewhere unpayable.
AT ASPEN, COLORADO, 2 the mineralizing solutions appear to have risen through the underlying siliceous formations (granite and quartzite) w^ith but little precipitation of ores, and through the overlying dolomitic and calcareous formations with much pre- cipitation, and finally, upon encountering the overlying shales and the prophyry sheet that was intruded at th...eir base, the solutions were impounded, and the shales reacted powerfully with the solutions for the production of large deposits.
AT BALLARAT, AUSTRALIA, 3 the prevailing country rocks are 1 J. H. Curie, "Gold Mines of the World, " p. 188.
2 J. E. Spurr, Economic Geology, IV, p. 310.
2 T. A. Rickard, Trans. , A. I. M. E. , XXX, p. 1010.
142 EXAMINATION OF PROSPECTS slates and sandstones that carry as intercalated members a series of black slate bands, which contain carbonaceous matter and pyrite.
What to read after The Examination of Prospects; a Mining Geology?
You can find similar books in the "Read Also" column, or choose other free books by Charles Godfrey Gunther to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The main slate band is 200 ft. In thickness, and the several veins carry ore where they pass through it, but are elsewhere unpayable.
AT ASPEN, COLORADO, 2 the mineralizing solutions appear to have risen through the underlying siliceous formations (granite and quartzite) w^ith but little precipitation of ores, and through the overlying dolomitic and calcareous formations with much pre- cipitation, and finally, upon encountering the overlying shales and the prophyry sheet that was intruded at th...eir base, the solutions were impounded, and the shales reacted powerfully with the solutions for the production of large deposits.
AT BALLARAT, AUSTRALIA, 3 the prevailing country rocks are 1 J. H. Curie, "Gold Mines of the World, " p. 188.
2 J. E. Spurr, Economic Geology, IV, p. 310.
2 T. A. Rickard, Trans. , A. I. M. E. , XXX, p. 1010.
142 EXAMINATION OF PROSPECTS slates and sandstones that carry as intercalated members a series of black slate bands, which contain carbonaceous matter and pyrite.
What to read after The Examination of Prospects; a Mining Geology?
You can find similar books in the "Read Also" column, or choose other free books by Charles Godfrey Gunther to read onlineMoreLess
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