Oxidation of sulfide ores in the Mildren and Steppe mining districts has yielded a wealth of supergene and mesogene minerals. The observed paragenetic sequence for supergene minerals in all instances follows the same pattern and, if the paragenesis is interpreted in the light of Eh-pH diagrams, it can be seen that oxidation began in highly acid waters and proceeded with continually increasing basicity and Eh. It is also evident that ions released in reactions must have been carried off by ground water. Many elements are found in the supergene minerals although relatively few occur in the hypogene ores. This is taken as evidence that some of the elements were effectively leached from the wall rocks.

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