 ... a large percentage of black sands, and it is then often difficult to concentrate the monazite to a marketable grade. As an offset to this, however, especially in regions where granite is associated with the hornblendic rocks, gold is often found in...  The Mining World - Page 531908Full view - About this book
 | Good Roads Institute, Chapel Hill, N.C. - Roads - 1897 - 1172 pages
...thorough that mica gneiss has become strikingly like granite gneiss. Associations of monazite. — The best deposits of monazite have been found in or...with a brilliant luster, which range in size up to 1 millimeter square and about 2 millimeters long. A fairly clean separation can be made by cleaning... | |
 | United States - 1908 - 916 pages
...with the hornblendic rocks, gold is often found in the concentrates in quantity more than sufficient to pay the cost of separation, and in the same localities...concentrates generally carry also a qua*ntity of zircon. This zircon is in the form of small, clear crystals with a brilliant luster, which range in size up... | |
 | United States. Bureau of Mines - Digital images - 1908 - 906 pages
...with the hornblendic rocks, gold is often found in the concentrates in quantity more than sufficient to pay the cost of separation, and in the same localities...concentrates generally carry also a quantity of zircon. This zircon is in the form of small, clear crystals with a brilliant luster, which range in size up... | |
 | 1909 - 852 pages
...with the hornblendic rocks, gold is often found in the concentrates in quantity more than sufficient to pay the cost of separation, and in the same localities...concentrates generally carry also a quantity of zircon. This zircon is in the form of small, clear crystals with brilliant luster, which range in size up to... | |
 | Mineral industries - 1909 - 1234 pages
...with the hornblendic rocks, gold is often found in the concentrates in quantity more than sufficient to pay the cost of separation, and in the same localities...concentrates generally carry also a quantity of zircon. This zircon is in the form of small, clear crystals with brilliant luster, which range jn size up to... | |
 | Elisha Mitchell Scientific Society (Chapel Hill, N.C.) - Natural history - 1908 - 186 pages
...with the hornblendic rocks, gold is often found in the concentrates in quantity more than sufficient to pay the cost of separation, and in the same localities...concentrates generally carry also a quantity of zircon. This zircon is in the form of small, clear crystals with brilliant lustre, which range in size up to... | |
 | Mineral industries - 1909 - 808 pages
...with the hornblendic rocks, gold is often found in the concentrates in quantity more than sufficient to pay the cost of separation, and in the same localities...concentrates generally carry also a quantity of zircon. This zircon is in the form of small, clear crystals with brilliant luster, which range in size up to... | |
 | Mineral industries - 1909 - 806 pages
...with the hornblende rocks, gold is often found in the concentrates in quantity more than sufficient to pay the cost of separation, and in the same localities...concentrates generally carry also a quantity of zircon. This zircon is in the form of small, clear crystals with brilliant luster, which range in size up to... | |
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