Manganese Deposits of the United States with Sections on Foreign Deposits, Chemistry, and UsesU.S. Government Printing Office, 1910 - 298 Seiten |
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alloys Analyses of manganese ash in dry associated Average Batesville bidder Blue Ridge bog manganese braunite breccia British thermal units brown Cambria County Cambrian carbonate Cartersville Cave Spring cavities cent ash cent manganese chert coal delivered consist contain contract contractor County Creek crystalline district dolomite dry coal east ferromanganese following are analyses formation fragments ganese Geological gneiss granite H₂O heat hydrous inches irregular jasper layers Leadville lenses limestone limonite localities manganese deposits manganese ore occurs manganese oxide manganiferous iron manganiferous silver manganous masses miles Mineral Resources U. S. mines MnO2 moisture Mountain ore-bearing Penrose permanganate pockets porphyry psilomelane pyrolusite quartz quartzite region Rept residual clays rhodochrosite rhodonite River rocks sample sandstone schist seams silicates SiO2 slope small quantities spessartite spiegeleisen steel surface Survey tons Trace U. S. Geol Valley varying veins Virginia zinc
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Seite 285 - Oil and gas in Louisiana, with a brief summary of their occurrence in adjacent States, by GD Harris.
Seite 131 - The jasper layers differ in thickness from a fraction of an inch to several feet. The same layer varies in thickness, pinching out locally In many places.
Seite 178 - Prices are based on ores containing not more than 8 per cent silica or 0.20 per cent phosphorus, and are subject to deductions as follows: For each 1 per cent in excess of 8 per cent silica there shall be deduction of 15 cents per ton; fractions in proportion.
Seite 239 - The economic value of a fuel is affected by the actual amount of combustible matter it contains, as determined by its heating value shown in British thermal units per pound of fuel, and also by other factors, among which is its ash content. The ash content not only lowers the heating value and decreases the capacity of the furnace, but also materially increases the cost of handling the coal, the labor of firing, and the cost of the removal of ashes, etc.
Seite 238 - State articles or work inferior to those required by contract. Payment for work done will be made only on the complete and satisfactory...
Seite 222 - On the basis of the adjusted price, allowance shall then be made for the varying heat values by computing the cost of 1,000,000 British thermal units for each coal offered. This determination...
Seite 179 - The following table shows the total quantity of manganese ore imported into the United States, as far as has been recorded. The figures from 1868 to 1888 represent imports from Canada only; those from 1889 to the present time represent total imports. Imports of manganese ore into the United States, 1868-1909, in long tons.
Seite 219 - Especial care should be exercised to note the proportion of slate and other foreign substances, hi order that such impurities may be included in the sample in the same proportion. Experience and good judgment on the part of the sampler are necessary to insure the collection of a representative sample; and it is well to remember that as the larger lumps of coal roll down and collect near the bottom of a pile or load a sample taken entirely from near the floor would not fairly represent the whole.
Seite 209 - Under present conditions the moisture is an important element in the valuation of a ton of coal. It is evidently necessary to consider the coal just as it is received in order to determine its value to the consumer, but chemical reports should be made on the basis of both the "dry coal
Seite 237 - If the bidder to whom the first award may l>e made should fail to enter into a contract, as herein provided, then the award may be annulled and the contract let to the next...