| 21. | Metasomatic altered aureoles can localize the deposition of metallic ore minerals and thus are of economic interest.
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| 22. | For copper, acids are generally needed to enhance solubility of the ore minerals within the solution.
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| 23. | Mineral Fork was so named on account of deposits of the lead ore minerals near its course.
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| 24. | Descloizite and mottramite were the main ore minerals in each of these deposits, which are now exhausted.
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| 25. | The principal ore mineral was chalcocite, although native copper predominated in the lower part of the beds.
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| 26. | It occurs in sedimentary marine evaporites and is a major potassium ore mineral in the Carlsbad Deposits of New Mexico.
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| 27. | In the supergene sulfide enriched zone, ore minerals include pearceite, proustite, tetrahedrite, polybasite, and pyrargyrite.
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| 28. | At about 13.8 fracturing soon followed, altering the dacite and depositing ore minerals and gangue in the veins.
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| 29. | In most forest ecosystems, sulfate is derived mostly from the atmosphere; weathering of ore minerals and evaporites contribute some sulfur.
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| 30. | A key objective in the metallurgical treatment of any ore is the separation of ore minerals from gangue minerals within the rock.
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