. Transactions. Fig. 3.—Development of Pyrite in Altered Monzonite. (From Eldo-rado Shaft, Boston Consolidated Group.) (Sp. 173 (48D). WithAnalyzer, x 48.) Magnetite and original biotite are absent, and pyrite (P) appears embedded insecondary quartz (Q), associated with flocculent aggregates of biotite (B) (prob-ably secondary). Feldspathic constituents have gone over to sericite (F). 558 GENESIS OF THE ORE-DEPOSITS AT BINGHAM, Fig. 4.—Chalcopyrite Developing in Secondary Quartz. (Sp. No. 171(48B). With Analyzer, x 48). From Dump of Eldorado Shaft, BostonConsolidated and
. Transactions. Fig. 3.—Development of Pyrite in Altered Monzonite. (From Eldo-rado Shaft, Boston Consolidated Group.) (Sp. 173 (48D). WithAnalyzer, x 48.) Magnetite and original biotite are absent, and pyrite (P) appears embedded insecondary quartz (Q), associated with flocculent aggregates of biotite (B) (prob-ably secondary). Feldspathic constituents have gone over to sericite (F). 558 GENESIS OF THE ORE-DEPOSITS AT BINGHAM, Fig. 4.—Chalcopyrite Developing in Secondary Quartz. (Sp. No. 171(48B). With Analyzer, x 48). From Dump of Eldorado Shaft, BostonConsolidated and original biotite individuals have disappeared. Chalcopyrite (Ch) has developed in secondary quartz (Q). Feldspathic groundmass has altered to sericite (S).
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