Mineral Resources of the United States, Parte1U.S. Government Printing Office, 1909 |
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Página 84
... siliceous ; in Virginia it is siliceous , hard , red ore . It is uniformly high in silica and phosphorus , and nearly all is of non - Bessemer grade . The following table shows the range in composition of a number of specimens of ...
... siliceous ; in Virginia it is siliceous , hard , red ore . It is uniformly high in silica and phosphorus , and nearly all is of non - Bessemer grade . The following table shows the range in composition of a number of specimens of ...
Página 98
... siliceous magnetite and hematite . Chloritic and carbonaceous slate , interbedded in its lower part with iron formation . Intrusive granite and diorite , principally the latter . Cretaceous sediments . Glacial drift , 80 to 350 feet ...
... siliceous magnetite and hematite . Chloritic and carbonaceous slate , interbedded in its lower part with iron formation . Intrusive granite and diorite , principally the latter . Cretaceous sediments . Glacial drift , 80 to 350 feet ...
Página 104
... siliceous white clay or with red loam . Under the chert beds there are alternating strata of chert and sandstone , mostly broken up but locally continuous , and under these are the solid sandstono strata forming a circular depression in ...
... siliceous white clay or with red loam . Under the chert beds there are alternating strata of chert and sandstone , mostly broken up but locally continuous , and under these are the solid sandstono strata forming a circular depression in ...
Página 118
... siliceous ores containing less than 40 per cent iron are not considered at present available unless their location near the fuel is exceptionally favorable , since the cost of transportation per unit of iron is excessive and since a ...
... siliceous ores containing less than 40 per cent iron are not considered at present available unless their location near the fuel is exceptionally favorable , since the cost of transportation per unit of iron is excessive and since a ...
Página 153
... siliceous gangue . GREAT BASIN REGION . A small deposit of manganese occurs 2 miles east of Golconda , Nev . It is bedded and varies in thickness from a few inches to 3 feet , and is interstratified with calcareous and siliceous tufa ...
... siliceous gangue . GREAT BASIN REGION . A small deposit of manganese occurs 2 miles east of Golconda , Nev . It is bedded and varies in thickness from a few inches to 3 feet , and is interstratified with calcareous and siliceous tufa ...
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Términos y frases comunes
10-stamp mill amounted Arizona average value bauxite bullion cadmium California carbonate Carolina chalcopyrite chromite clay Colorado concentrating mill containing copper Copper Company County in 1908 Creek crude cyanide cyanide plant decrease deep mines deposits district.-The dredge drift feet deep following table furnace Geological gold and silver Gold Mining Company granite hematite hübnerite hydraulic Idaho important increase lead and zinc limestone lode long tons magnetite manganese metals miles mineral products Mining and Milling Mountain Nevada North occur operated ounces of gold ounces of silver output oxide pig iron placer mines platinum pounds of copper pounds of lead production in 1908 production of gold pyrite quartz refined reported rock scheelite schists shipments short tons siliceous silver mills small quantity smelters smelting South steel sulphide Survey tonnage total value treated tungsten tunnel U. S. Geol United Utah veins Virginia wolframite yield zinc blende
Pasajes populares
Página 238 - ... estimated duties for the transportation of the ores by common carriers bonded for the transportation of appraised or unappraised merchandise to properly equipped sampling or smelting establishments, whether designated as bonded warehouses or otherwise. On the arrival of the ores at such establishments they shall be sampled according to commercial methods under the supervision of Government officers, who shall be stationed at such establishments, and who shall submit the samples thus obtained...
Página 238 - ... they shall be sampled according to commercial methods under the supervision of Government officers, who shall be stationed at such establishments, and who shall submit the samples thus obtained to a Government assayer, designated by the Secretary of the Treasury, who shall make a proper assay of the sample, and report the result to the proper customs officers, and the import entries shall be liquidated thereon, except in case of ores that shall be removed to a bonded warehouse to be refined for...
Página 77 - Newfoundland into this country during the year 1907; whilst, according to the statistics published by the Bureau of Statistics of the Department of Commerce...
Página 236 - States as shown by the report of the Bureau of Statistics of the Department of Commerce and Labor...
Página 132 - XLV. 463 pp. 1903. CLEMENTS, JM, SMYTH, HL, BAYLEY, WS, and VAN HISE, CR The Crystal Falls iron-bearing district of Michigan. Monograph XXXVI. 512 pp. 1899.
Página 695 - UDDEN, JA A sketch of the geology of the Chisos country, Brewster County, Texas.
Página 5 - The statistics of the imports and exports of minerals, which form an essential part of the volume, are obtained through the courtesy of the Chief of the Bureau of Statistics, Department of Commerce and Labor.
Página 83 - ... and shale, and is consequently of no possible value; and finally the upper bench itself becomes shaly and carries only a very low-grade ore. The Irondale seam is best developed on Red Mountain between Pilot Knob on the northeast and Lone Pine Gap on the southwest. Southwest of Lone Pine Gap the seam 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...
Página 220 - ... and rolling, but is suitable for copper castings, and a large part of it is put to that use. Lake copper excepted, a comparatively small percentage of the copper output carries such low values in precious metals that, together with the value added to the copper by electrolytic refining, these values will not more than pay for the electrolytic refining of the copper; consequently the output of casting copper is comparatively small.
Página 238 - ... satisfactory bonds be designated as bonded smelting warehouses. Ores or crude metals may be removed from the vessel or other vehicle in which imported, or from a bonded warehouse, into a bonded smelting warehouse without the payment of duties thereon and there smelted or refined, or both, together with...