From page 3: Uraniferous fluorspar pipes cut Paleozoic dolomite in the western part of the Thomas Range, along a ridge known locally as "Spor's Mountain". The fluorspar district (fig. 1) is approximately 50 miles northwest of Delta, Utah, and is in Tps. 12, 13 N., R. 12 W., Salt Lake principal meridian. From July to September 1952 approximately 10 man-months were spent in the district. During this time, field work started in 1951 was completed. Mapping and sampling the fluorspar deposits was done in 1950 (reported in TEI-136). The entire uraniferous fluorspar district has now been mapped at a scale of 1 inch to 1, 000 feet, the complete stratigraphic section of the district has been measured in detail, and additional mine mapping and sampling has been done.