Transactions of the American Institute of Mining, Metallurgical, And Petroleum Engineers, Incorporated
Transactions of the American Institute of Mining, Metallurgical, And Petroleum Engineers, Incorporated
American Institute of Mining, Metallurgical, And Petroleum Engineers
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In limestones containing organic matter, especially if the rock be easily dissolved by waters carrying carbonic acid, the -efficiency of even so minute a quantity as a fraction of one per * The Lead' and Zine-Depotits of the Ozark BegUM, by H. F. Bain, p. 169. t Trafw., xxii., 171-225. THE CHEMISTRY OF ORE-DEPOSITION. 44T cent, of bituminous substances, in inducing the precipitation and crystallization of the ores, is very great. Small as the proportion of the carbonaceous matter may be, it is ...liberated by the rapid subterraneous erosion of the lime-strata, in quan- tity more than is required to consume the free oxygen in the ore-forming solutions, and to reduce all sulphates to sulphides* In limestones highly soluble in carbonated waters, two-tenth& of one per cent, of any strongly deoxidizing material, as bitu- minous coal or bitumen, disseminated in the rock, appears to be ample to effect the reduction of the metals, and to induce the deposition of the ores in the special geological formation.
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