Introduction: This study was made in conjunction with a core drilling program designed to trace ore trends from existing mines eastward under deeper cover. The exploration drilling covered an area of about 1 square mile. The results of previous drilling by the Commission, which covered an additional 10 square miles, have been incorporated in this report.

Gregory described the broad geologic and geographic features of the white canyon area in the reconnaissance report on San Juan county.

A report discussing exploratory diamond drilling in the Posey and Markey localities.

Discussing holes drilled in order to evaluate the uranium potential of the Red Canyon area, in San Juan County, Utah.

From introduction: This report contains the results of a detailed geological and uranium deposits study made of the Monument Valley.

The present report was prepared to serve mainly as a resume of the AEC 1953 drilling project at Big Indian Wash, and a record of related activities up to early 1954.

Report discussing the geology of the Red House Cliffs area, which comprises 296 square miles of canyon and plateau country in southwestern San Juan County, Utah.

Introduction: Under a contract between the United States Atomic Energy Commission and the University of Utah the writer has been investigating the sedimentary relations of the uranium deposits of the Salt Wash sandstone in the Colorado Plateau.

Abstract: The Happy Jack uranium deposit of White Carron, San Juan County, Utah, was studied in connection with an Atomic Energy Commission exploration program. The major uranium ore control is a paleostream channel containing sediments of the Shinarump conglomerate. Intrachannel controls include organic matter, lithologic variations, and channel "lows". Microscopic studies reveal that uraninite, the primary ore mineral, occurs as cement and as a replacement of organic material. Both the uraninite and copper sulfides replace secondary quartz overgrowths. Crystals of chalcopyrite, chalcocite, and pyrite occur one within the other. Resolution of bornite and chalcopyrite is present. Uraninite is dated as later than the secondary overgrowths and of about the same age as the copper sulfides.