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At least 955 records · Page 53Linked to original sources
USGS1958

Directional resistivity measurements in exploration for uranium deposits on the Colorado Plateau

A study of the electrical properties of the Morrison formation in the Uravan mineral belt of the Colorado Plateaus province indicated that there is a significant correlation between electrical resistivity and the relative favorability for occurrence of ore. The differences in resistivity were not large enough to provide a recognizable target for standard resistivity' field methods, especially where the ore-bearing sandstone member is more than a few hundred feet deep. Measurement of resistivity trends by placing one electrode in a drill hole and spreading the others out radially on the surface seemed to offer a means of exploiting the resistivity-favorability correlation. Field tests of such directional resistivity measurements were made in the Spud Patch area in San Miguel County, Colo., and the White Canyon district) San Juan County, Utah. In the Spud Patch area two methods were tried; in one a current electrode was placed in the drill. hole, and in the other, a potential electrode. The second was the more tedious but provided the more readily interpretable results. A comparison of the resistivity trends thus determined with the favorability estimated from geologic indexes indicated that directional resistivity methods could predict the location of favorable areas at distances of 600 to 1,000 feet with a high degree of success. In the White Canyon district directional resistivity measurements were made on the assumption that the conglomerate which is found in many channels filled with the Shinarump member of the Chinle formation has a high resistivity. The measurements were successful in tracing the channel conglomerate where surface conditions were favorable.

Arizona;Colorado;New Mexico;Utah↗
USGS1956

Botanical prospecting for uranium in the Circle Cliffs area, Garfield County, Utah

Astragalus pattersoni and Stanleya pinnata broadly define some uraniferous localities adjacent to the contact of the Moenkopi formation and the Shinarump member of the Chinle formation, but the general paucity of Astragalus in the Circle Cliffs area limits the usefulness of this genus. Astragalus pattersoni , Stanleya pinnata , and Aster venustus (?) may serve as guides to mineralized parts of the Salt Wash sandstone member of the Morrison formation in the Circle Cliffs area. Thick and thin sandstones of the Shinarump member generally can be distinguished by pinyon-juniper ration studies. These studies may supplement drilling to define channel-fill sandstones which are associated with ore deposits in the Circle Cliffs area. Ratio studies appear to be applicable to other areas throughout the Colorado Plateau where similar geological and ecological conditions exist.

Utah↗