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Native Copper-bearing Conglomerate

Native Copper-bearing Conglomerate

As North America's rift failed, sulfur-poor solutions percolated through its rocks, taking copper from basalt and depositing it in overlying sediments.

Witwatersrand Conglomerate

Witwatersrand Conglomerate

This rock contains tiny sedimentary particles of gold, uraninite, and pyrite. Such ores can no longer form. Higher levels of oxygen in today's atmosphere would alter the uraninite and pyrite particles before they could be deposited.


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