Mineral Resources of the United States, Частина 1

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Сторінка 554 - No. 185, which may be obtained on application to the Director of the United States Geological Survey, Washington, DC...
Сторінка 48 - In calculating the metal content of the ores from assays allowance has been made for smelting losses in the case of zinc but not in the case of lead. In comparing the values of ore and metal it should be borne in mind that the value given for the ore is that actually received by the producer, whereas the value of the lead is calculated from the average daily quotations at New York.
Сторінка 20 - Composition or red brass : Shall consist of red scrap brass, valves, machinery bearings, and other parts of machinery, including miscellaneous castings made of copper, tin, zinc, and/or lead, no piece to measure more than 12 inches over any one part...
Сторінка 20 - Inc., appointed for this purpose, to determine the amount of such damages. (d) In the event that buyer should claim the goods, delivered on a contract are not up...
Сторінка 799 - The production of refined lead can with difficulty be apportioned according to sources of ore, owing to the fact that lead refiners treat smelted products whose origin may, as in custom refining, be unknown to them, the identity of the ore and thus its original source being preserved only so far as the smelter.
Сторінка 49 - Of these openings there are five or six, the "top," "middle," and "third" being the most prolific of ore. The "flats" and "pitches" common in the Wisconsin mines have been found in only one or two instances in Iowa. The crevices have an east-west trend and sometimes extend considerable distances, being mined at different places, in which case they are known as "ranges.
Сторінка 38 - The lead concentrates produced in southern Illinois are recovered in concentrating the fluorspar. To speak of the total crude ore raised as crude lead ore would be misleading. No attempt has been made, therefore, at calculating the quantity or the tenor of the crude ore.
Сторінка 168 - Deposits of manganese ore occur in many parts of the United States, but are most abundant in the Appalachian and Piedmont regions, in the southern Mississippi Valley, and on the Pacific coast. Small deposits occur in the New England, Rocky Mountain, and Great Basin regions. The principal producing districts up to the present time have been the James...
Сторінка 553 - Exclusive of the Michigan ores that did not yield silver, there was still included considerable ore from which the gold and silver values were not recovered, namely, that producing the casting copper from the Morenci-Metcalf district, Arizona, and from the Ducktown district, Tennessee, and to a slight extent^ from other districts. This casting copper was not electrolytically refined, and consequently the precious-metal values were not recovered from it. Among the important copper-producing States...
Сторінка 805 - ... States, the loss in smelting, ranging from 2 to 5 per cent in treating easily reducible ores and up to 10 or more per cent in the more refractory ores. Losses running over 20 per cent have been claimed in smelting ores running high in antimony and arsenic. Lag being left out of account, the totals would normally show a mine excess equal to this smelting loss. Any discrepancy which appears in the table may reasonably be ascribed to one or more of these items. In the long run, barring error and...

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