|
CopperInfo.com - Natural Presence of Copper (212 words) |
 | In these ores, the copper can occur in sulfide deposits (in the minerals chalcopyrite, bornite, chalcocite, and covellite), in carbonate rocks (in the minerals azurite and malachite), in silicate deposits (in the minerals chrysycolla and dioptase), and as pure "native" copper metal. |
| The mean concentrations of copper in rocks range from a low of 2 parts per million (ppm) in sandstones, to 4 ppm in limestones, to 15 ppm in granites, to 70 ppm in fl shales, and to 90 ppm in basalts. |
| Copper can be released from these rocks during the natural course of weathering, where it can find its way to soils, lakes, rivers, and oceans. |
Feeds |
Contact