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Gold ores (auriferous altered rhyolite)
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Gold ore (auriferous altered rhyolite) in Colorado
(13 F)
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Gold ore (auriferous altered rhyolite) (Golden Wonder Vein, Late Oligocene, 27.5 Ma; Golden Wonder Mine, San Juan Mountains, Colorado, USA) 2 (25246150567).jpg
3,548 × 1,949; 4.48 MB