Copper ions that move down into this reducing environment form a zone of supergene sulfide enrichment. Covellite CuS, chalcocite Cu2S and native copper Cu are stable in these conditions and they are characteristic of the enriched zone.
The net effect of these supergene processes is to move metal ions from the leached zone to the enriched zone, increasing the concentration there to levels higher than in the unmodified primary zone, possibly producing a deposit worth mining.
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