Category:Silver (Mesoproterozoic; Houghton, Michigan)

Media in category "Silver (Mesoproterozoic; Houghton, Michigan)"

The following 2 files are in this category, out of 2 total.

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  Silver (Mesoproterozoic, 1.05-1.06 Ga; copper mine near Houghton, Michigan, USA) 1 (17084983589).jpg 2,728 × 1,863; 4.3 MB
  
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  Silver (Mesoproterozoic, 1.05-1.06 Ga; copper mine near Houghton, Michigan, USA) 2 (16650959963).jpg 3,852 × 2,127; 5.19 MB