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Books Books 1 - 8 of 8 on Its soft ore, now nearly all mined out either by surface trenches or drifts, is the....
" Its soft ore, now nearly all mined out either by surface trenches or drifts, is the best in the district. Its hard ore is also of high grade and hitherto has been for the most part held in reserve, since ore could be produced from the thicker Big seam... "
Contributions to Economic Geology, 1906: Metals and nonmetals, except fuels - Page 140
by Edwin Clarence Eckel, Samuel Franklin Emmons - 1907
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Mining and Metallurgy: Published Monthly by the American ..., Issues 19-24

Mineral industries - 1908
...Gap on the SE. Southwest of Lone Pine Gap the bed either consists of interbedded low-grade iron-ore and shale, or else its identity is completely lost. Its soft ore, now nearly all mined out either by surface-trenches or slopes, is the best in the district. Its hard ore is also of high grade, and hitherto...
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Bulletin - United States Geological Survey, Issue 400

Geological Survey (U.S.) - Geology - 1910
...Pilot Knob on the northeast and Lone Pine Gap on the southwest. Southwest of Lone Pine Gap the bed consists of interbedded lowgrade iron ore and shale...nearly all mined out either by surface trenches or drifts, is the best in the district. Its hard ore is also of high grade and hitherto has been for the...
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Iron Ores, Fuels, and Fluxes of the Birmingham District, Alabama

Ernest Francis Burchard, Charles Butts, Edwin Clarence Eckel - Coal mines and mining - 1910 - 204 pages
...Pilot Knob on the northeast and Lone Pine Gap on the southwest. Southwest of Lone Pine Gap the bed consists of interbedded lowgrade iron ore and shale...nearly all mined out either by surface trenches or drifts, is the best in the district. Its hard ore is also of high grade and hitherto has been for the...
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Geology and Oil Resources of the Coalinga District, California

Ralph Arnold, Robert van Vleck Anderson, Irving Cowan Allen - Fresno County (Calif.) - 1910 - 354 pages
...Pilot Knob on the northeast and Lone Pine Gap on the southwest. Southwest of Lone Pine Gap the bed consists of interbedded lowgrade iron ore and shale...nearly all mined out either by surface trenches or drifts, is the best in the district. Its hard ore is also of high grade and hitherto has been for the...
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Transactions of the American Institute of Mining, Metallurgical ..., Volume 40

Mineral industries - 1910
...gap on the SE. Southwest of Lone Pine gap the bed either consists of interbedded low-grade iron-ore and shale, or else its identity is completely lost. Its soft ore, now nearly all mined out either % surface-trenches or slopes, is the best in the district. Its hard ore is also of high grade, and...
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Bulletin

Mines and mineral resources - 1916
...of low-grade ore and shale or losing its identity entirely. Burchard0 says of the grade of the ore : Its soft ore. now nearly all mined out either by surface trenches or drifts, is the best of the district. Its hard ore is also of high grade and has hitherto been for the...
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Mineral Resources of the United States, Part 1

Mineral industries - 1909
...great thickness, there are rarely more than 10 to 12 feet of good ore in a single bench, and at most places only 7 to 10 feet are mined. Probably the maximum...thicker Big seam at a lower cost per unit of iron. According to texture the Clinton ores are of two varieties, viz: (1) fossil ore and (2) oolitic ore....
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Congressional Serial Set

United States - 1907
...either consists of interbeddeJ low-grade iron ore and shale or else its identity is completely !<*'• Its soft ore, now nearly all mined out either by surface trenches ur CLINTON ORES OF BIRMINGHAM DISTRICT, ALABAMA. slopes, is the best in the district. Its hard ore...
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