A Text book of Mining Geology for the Use of Mining Students And Miners

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133 and may be either intergrown, or inetasomatic replacements, or the result of interstitial filling with partial replacement. The conversion to garnet-epidote-calcite, etc. , rock was complete before the consolidation of the igneous rock. The ore-minerals were introduced in gases and vapours solfataric emanations from the eruptive masses, of which they constitute pneumatolytic after-actions, or by hot circulating waters given off by the cooling igneous mass. This theory of the genesis being t...rue, the deposits should extend downward in depth to the granular rock. " Professor Kemp, of New York, in a valuable paper on "The Role of Igneous Rocks in the Formation of Veins, " l maintains that the circulation of ground-water is insufficient to account for the majority of the ore-deposits in the United States. He supports the petrological view, that igneous rocks must have furnished not- only the metallic contents, but a large proportion of the waters which brought the metals into their present position.

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