Uranium in the Tertiary Intermontane Basins of Colorado 1969
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The uranium occurrences in the Colorado basins are spatially related to volcanic fields, principally of Oligocene age, where lithologically favorable fluvial host sediments are (1) subjacent to the volcanic piles in the upland basins or (2) subjacent to volcaniclastic outwash and tuffaceous lake beds in deeper basins near the volcanic piles. This paper—originally read before the National Western Mining Conference of the Colorado Mining Association at Denver, CO, 1969, and published with permission by the Grand Junction A.E.C. office—surveys and maps the major uranium deposits in Tertiary sediments.