The ore deposits of Utah . I. VIEW IN 1908, WHEN ORIGINAL OUTLINE OF HILL WAS STILL - l^* * ^- *•?* STHl N(i IS NEARLY COMPLETE AND MUCH ORE MINLD. OUTCROP OF PORPIIYHY ORE DEPOSITS OF UTAH COPPER CO. IN BINGHAM CANYON. PboiOgrapha furnwht-d by Utah Copper Co. OQUIRRH RANGE. 361 LEAD-SILVER ORES. Galena, which forms the most importantprimary mineral of the lead-silver ores, is rela-tively resistant to weathering agencies. Con-sequently, the alteration of these ores has pro-ceeded slowly, and many residual fragments ofgalena remain in the ore even near the out-crop. Tetrahedrite, whi
The ore deposits of Utah . I. VIEW IN 1908, WHEN ORIGINAL OUTLINE OF HILL WAS STILL - l^* * ^- *•?* STHl N(i IS NEARLY COMPLETE AND MUCH ORE MINLD. OUTCROP OF PORPIIYHY ORE DEPOSITS OF UTAH COPPER CO. IN BINGHAM CANYON. PboiOgrapha furnwht-d by Utah Copper Co. OQUIRRH RANGE. 361 LEAD-SILVER ORES. Galena, which forms the most importantprimary mineral of the lead-silver ores, is rela-tively resistant to weathering agencies. Con-sequently, the alteration of these ores has pro-ceeded slowly, and many residual fragments ofgalena remain in the ore even near the out-crop. Tetrahedrite, which is an importantsilver-bearing mineral, is more readily at-tacked. The final product of alteration of thegalena is ordinarily the carbonate, cerusite,though the sulphate, anglesite, commonlyforms as an intermediate product and morecomplex sulphates are probably also oxidized lead-silver ore bodies show nomarked migration of the lead or silver, thoughthey have been somewhat enriched and wererendered much more favorable to the earlytreatment by the removal of other elements.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
