Mineral potential and geology of the Sioux Quartzite


The Sioux Quartzite, inferred on indirect evidence to have been deposited in the time interval between 1.76 and 1.63 Ga, rests unconformably on Archean rocks of the MRV subprovince and minor Early Proterozoic intrusions within them. The great bulk of the Sioux is a supermature quartz arenite that was deposited principally by a southeastward-draining plexus of braided streams. The basal contact zone of the Sioux has been considered as a speculative locus for unconformity-related uranium deposits of the Athabaska type, but it never has been seriously explored. In addition, the formation has received speculative consideration as a host for paleoplacer gold deposits.
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