Unconformities are important in localizing epigenetic ore deposits in at least 68 districts. These deposits represent a wide range of mineral commodities, as well as structural and genetic types. 'The principal role of the unconformity has been to provide, directly or indirectly, porous and permeable plumbing systems for the circulation of ore-forming fluids or for the deposition of valuable epigenetic mineral deposits.' Six categories of control by unconformities are recognized.

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