Data on the concentration of leachable uranium, total uranium, beta-gamma activity, alpha activity, and petrography are presented for core samples from the vicinity of the Homestake ore body, Big Indian Wash, San Juan County, Utah. It is shown that the leachable uranium content in such cores is generally highest in the vicinity of the Chinle-Cutler contact, and that the contours of leachable uranium for this horizon outline satisfactorily the Homestake ore body and an east-west trending belt of mineralization including the Homestake and the Standard-Caluranium ore bodies. This trend is defined more precisely by data on the leachable uranium concentration than by the beta-gamma activity of the samples studied, and it is concluded that leachable uranium analyses may serve as a useful tool in exploration for uranium ore.

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