United States Congressional Serial SetU.S. Government Printing Office, 1912 Reports, Documents, and Journals of the U.S. Senate and House of Representatives. |
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Página 144
... drilling is stopped and the exact depth of the hole is measured and recorded . The relative quantity of ore per foot ... drill holes . Such results may appear manifestly inaccurate to one who has never had experience with such ...
... drilling is stopped and the exact depth of the hole is measured and recorded . The relative quantity of ore per foot ... drill holes . Such results may appear manifestly inaccurate to one who has never had experience with such ...
Página 146
... drilling ; quality and quantity of ore ; average sample and how to get it ; ap- proximate analyses in the woods . The discussion of magnetism touches among other things on magnetism of rocks and use of the needle ; elementary principles ...
... drilling ; quality and quantity of ore ; average sample and how to get it ; ap- proximate analyses in the woods . The discussion of magnetism touches among other things on magnetism of rocks and use of the needle ; elementary principles ...
Página 149
... drill for these ore bodies . * * * The majority of the ore bodies themselves and also the inclosing rocks unaltered by the effects of metamorphism by igneous intrusion are nonmagnetic , but fortunately for the magnetic prospector it ...
... drill for these ore bodies . * * * The majority of the ore bodies themselves and also the inclosing rocks unaltered by the effects of metamorphism by igneous intrusion are nonmagnetic , but fortunately for the magnetic prospector it ...
Página 152
... drilling before mining begins . It has usually been assumed that if drilling does not locate an ore body it is useless to sink a shaft for this purpose . Mining operations have necessarily disclosed much ore which had not previously ...
... drilling before mining begins . It has usually been assumed that if drilling does not locate an ore body it is useless to sink a shaft for this purpose . Mining operations have necessarily disclosed much ore which had not previously ...
Página 153
... drilling . Both diamond and churn drills are in use . Through surface and soft - ore formations the churn drill is used . Much of the Mesabi district may be so explored . The cost of churn drilling has ranged from $ 1 to $ 3.50 and ...
... drilling . Both diamond and churn drills are in use . Through surface and soft - ore formations the churn drill is used . Much of the Mesabi district may be so explored . The cost of churn drilling has ranged from $ 1 to $ 3.50 and ...
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aggregated Amalgamation amounted Arizona average value base bullion bullion California carbonate centration clay products coal Colorado compared concen concentrating plant concentration mill containing copper-lead Creek crude Crusher cyanide plant decrease deep mines deposits depth district.-The dredges drilling dry or siliceous exports feet deep feet of drifts following table furnaces galena Geological gold and silver Grant County gravel Huntington mill Idaho important increase jigs Lake Superior lead and zinc lead concentrates lead-zinc lessees lode long tons magnetic manganese Mexico Michigan mineral production Missouri Montana Nevada Nye County old tailings operated ounces of gold ounces of silver oxidized pig iron placer mines pounds of copper pounds of lead principal production in 1911 production of gold pyrite recovered refined reported rock shipments shipped to smelters short tons silver mills smelters smelting Socorro County sphalerite sulphide Survey tion tonnage total value U. S. Geol United Utah vertical shaft yielded zinc concentrates
Pasajes populares
Página 213 - WORLD'S PRODUCTION OF GOLD. The production of gold in the world since 1860 is shown in the following table from the report of the Director of the Mint for the fiscal year ended June 30, 1911.
Página 208 - Manganese deposits of the United States, with sections on foreign deposits, chemistry, and uses: US Geol.
Página 340 - Provided further, That all labor performed and services rendered pursuant to this section shall be under the supervision of an officer of the customs, to be appointed by the Secretary of the Treasury...
Página 384 - ... 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 exportation as provided by law. And the Secretary of the Treasury is authorized to make all necessary regulations to enforce the provisions of this paragraph.
Página 384 - Treasury is authorized to make all necessary regulations to enforce the provisions of this paragraph. 194. Zinc in blocks or pigs and zinc dust, one and three-eighths cents per pound; in sheets, one and five-eighths cents per pound; in sheets coated or plated with nickel or other metal, or solutions, one and three-fourths cents per pound; old and worn-out, fit only to be remanufactured, one cent per pound.
Página 309 - Association reported the stock of the marketable copper held at all points in the United States on the first of each month. The following table shows the stocks held on the first of each month...
Página 156 - The following table shows the number of blast furnaces in blast on June 30 and December 31, and the total number of stacks recorded for the years...
Página 353 - The statistics of domestic consumption are taken in part from the smelter returns and in part from the records of the Bureau of Statistics of the Department of Commerce and Labor, and the tables for foreign production and consumption were compiled from the sources indicated. i In Mineral Resources for 1906, p. 461, zinc derived from ore was called "primary" spelter to distinguish it from the secondary spelter recovered from such sources as drosses, skimmings, and old metal.
Página 340 - Lead dross, lead bullion or base bullion, lead in pigs and bars, lead in any form not specially provided for in this...
Página 161 - The imports of the alloys of the rarer metals are not all reported separately. For instance, the imports of ferrochrome are combined with those of chromium; those of ferromolybdenum are combined with those of the metal molybdenum, and those of ferrotungsten are included with those of tungsten. For the sake of comparison, however, such statistics as are available are presented in the following table: Imports of ferro-alloys in 1910 and 1911, in long tons.