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The Proterozoic System contains many of the world’s major uranium deposits. The earliest are of the quartz pebble conglomerate-type and are typified by the deposits at Elliot Lake, which belong to the uranium-thorium association. They have uraninite with both uranium and thorium, and represent paleoplacers. Except for some very small occurrences, this type of deposit developed only before 2,000 Ma ago. The principal economic deposits that first appeared during the Middle Proterozoic contain uranium without thorium, and all three types (sandstone, vein, and unconformity) were formed in conjunction with fluvial sandstone. It appears that prior to 2,000 Ma ago the...

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