 | Geological Survey (U.S.) - Geology - 1908 - 320 pages
...limestone beds and greenstone southwest of the main ore body, nor does it extend in a \vellrdeveloped form for any considerable distance northeast of it....ore sufficiently rich to be mined may be greater. body. The longer of these crosscuts starts on the east side of the ridge, 75 feet below its top. It... | |
 | Geological Survey (U.S.) - Geology - 1909 - 132 pages
...abruptly on the south in a nearly vertical limestone wall, but on the north gives place to the lower grade ores, consisting of small veins of azurite and chalcocite...ore sufficiently rich to be mined may be greater. A little chalcocite and less bornite is found in some of the shearing planes in the greenstone, but... | |
 | Dwight T. Randall, H. T. Weeks, H. W. Weeks - Coal - 1909 - 692 pages
...vertical limestone wall, but the north gives place to the lower grade ores, consisting of small ins of azurite and chalcocite with scattered masses of...ore sufficiently rich to be mined may be greater. A little chalcocite and less bornite is found in some of the shearing planes in the greenstone, but... | |
 | Edson Sunderland Bastin - Gems - 1911 - 734 pages
...surface for a distance of at least 150 feet northeast from the high-grade ores, and small^scattered azurite veins extend still farther in that direction....rich ore, with its included limestone, as seen at the surf ace, has a width of approximately 25 feet, although the thickness of ore sufficiently rich to... | |
 | William Harvey Emmons - Chemistry, Inorganic - 1913 - 274 pages
...silver to the ton and is estimated to contain over 100,000,000 pounds of copper.4 The thickness is indefinite, but the very rich ore, with its included...ore sufficiently rich to be mined may be greater. Below the deposit a little chalcocite and less bornite are found in some of the shearing planes in... | |
 | Ulysses Sherman Grant, Daniel F. Higgins - Glaciers - 1913 - 800 pages
...silver to the ton and is estimated to contain over 100,000,000 pounds of copper.4 The thickness is indefinite, but the very rich ore, with its included...ore sufficiently rich to be mined may be greater. Below the deposit a little chalcocite and less bornite are found in some of the shearing planes in... | |
 | Geological Survey (U.S.) - Geology - 1913 - 272 pages
...silver to the ton and is estimated to contain over 100,000,000 pounds of copper.4 The thickness is indefinite, but the very rich ore, with its included...ore sufficiently rich to be mined may be greater. Below the deposit a little chalcocite and less bornite are found in some of the shearing planes in... | |
 | William Harvey Emmons - Ore-deposits - 1917 - 574 pages
...large reserves have been discovered in this region by the Kennicott Mining Co. In the Bonanza mine the very rich ore, with its included limestone, as...ore sufficiently rich to be mined may be greater. Below the deposit a little chalcocite and less bornite are found in some of the shearing planes in... | |
 | Geological Survey (U.S.) - Geology - 1917 - 572 pages
...large reserves have been discovered in this region by the Kennicott Mining Co. In the Bonanza mine the very rich ore, with its included limestone, as...ore sufficiently rich to be mined may be greater. Below the deposit a little chalcocite and less bornite are found in some of the shearing planes in... | |
 | William Harvey Emmons - Geology, Economic - 1918 - 636 pages
...large reserves have been discovered in this region by the Kennicott Mining Co. In the Bonanza mine the very rich ore, with its included limestone, as...ore sufficiently rich to be mined may be greater. Below the deposit a little chalcocite and bornite are found in some of the shearing planes in the greenstone.... | |
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... azurite veins extend still farther in that direction. The ore, as it shows on the surface, therefore, extends northeast and southwest along the strike for a distance of 400 feet. The thickness, however, is more indefinite, but the very rich ore, with... 