Introduction: The specific purpose of the work was to learn whether the selenium indicated by the presence of Astragalus g. was uniformly distributed in one or more formations, i.e., probably syngenetic, or whether it was spatially and, therefore genetically, related to alteration.
Introduction: The writer visited the Sayapullo mine May 14 and 15, 1959, for comparative orientation, study of the uranium occurrence, and observation of alternation-metallization relations.
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