The Richest Section of Yale District British Columbia Nicola Similkameen An
The Richest Section of Yale District British Columbia Nicola Similkameen An
Frank Bailey
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An assay of the sample is the only means of acquiring the slightest information as to its gold contents, as free gold is rarely visible. In many cases it is impossible to distinguish a sample which will give twenty dollars to the ton from one that will assay two dollars per ton. Again in the oxidized rock of the surface one can often wash a crushed sample in a great number of very fine colors of gold will appear in the bottom of the pan. In another sample no colors will be obtained, yet the one... will; give as good results on an assay as the other. As a rule, however, some assay values in gold will be obtained when arsenopyrite occurs in that altered sediments where they are cut by the acid variety of monzonite or its dike equivalent. As to the original source of the arsenopyrite, one does not have to look farther than the monzonite itself. It occurs in small quantities as an acces- sory mineral in the monzonite mass, but in the dikes and sheets of andesite it is so plentiful as to appear almost as an essential constituent.
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