From introduction: This report describes the program of research on mineralogy and petrography of certain uraniferous vein deposits in the Boulder batholith of western Montana.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Hailey quadrangle including a detailed geologic summary, interpretation report, standard deviation maps, pseudo-contour maps, interpretation maps, flight line and geologic base map, and individual corrected profiles.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Idaho Falls quadrangle including a detailed geologic summary, interpretation report, standard deviation maps, pseudo-contour maps, interpretation maps, flight line and geologic base map, and individual corrected profiles.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Elk City quadrangle including a detailed geologic summary, interpretation report, standard deviation maps, pseudo-contour maps, interpretation maps, flight line and geologic base map, and individual corrected profiles.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Boise quadrangle including a detailed geologic summary, interpretation report, standard deviation maps, pseudo-contour maps, interpretation maps, flight line and geologic base map, and individual corrected profiles.

Final report documenting a high-sensitivity airborne radiometric and magnetic survey of the Boise, Hailey, Idaho Falls, and Elk City quadrangles including the survey description, specifications, data processing methods, interpretation methods, and regional geologic review.

Abstract: A low-level airborne radioactivity survey of parts of Beaverhead and Madison Counties in southwestern Montana was undertaken from June 6 to October 14, 1955. Flying centered around the Ruby Range-Sweetwater Basin area and concentrated on the Precambrian metamorphic complex and Tertiary lake-bed sediments. No commercial uranium deposits were discovered, and no extensions were found of the few known small occurrences. Five areas of high background detected through the survey were investigated on the ground.

This volume contains information and survey results pertaining specifically to the Cut Bank NTMS 1:250,000-scale Quadrangle, Montana, one of a group of 12 such quadrangles in Arizona, Idaho, Montana, New Mexico, South Dakota, and Washington included in an aerial radiometric and magnetic reconnaissance survey. Information concerning the instrumentation and methods used in data acquisition, processing, and interpretation is presented in Volume 1 of this final report.

From introduction: This volume contains information and survey results pertaining specifically to the Shelby NTMS 1:250,000 scale Quadrangle, Montana, one of a group of 12 such quadrangles in Arizona, Idaho, Montana, New Mexico, South Dakota, and Washington included in an aerial radiometric and magnetic reconnaissance survey. General information concerning the instrumentation and methods used in data acquisition, processing, and interpretation is presented in Volume 1 of this final report.

From introduction: This volume contains information and survey results pertaining specifically to the Havre NTMS 1:250,000 scale Quadrangle, Montana, one of a group of 12 such quadrangles in Arizona, Idaho, Montana, New Mexico, South Dakota, and Washington included in an aerial radiometric and magnetic reconnaissance survey. General information concerning the instrumentation and methods used in data acquisition, processing, and interpretation is presented in Volume 1 of this final report.

From introduction: This volume contains information and survey results pertaining specifically to the Lewistown NTMS 1:250,000 scale Quadrangle, Montana, one of a group of 12 such quadrangles in Arizona, Idaho, Montana, New Mexico, South Dakota, and Washington included in an aerial radiometric and magnetic reconnaissance survey. General information concerning the instrumentation and methods used in data acquisition, processing, and interpretation is presented in Volume 1 of this final report.

From introduction: This volume contains information and survey results pertaining specifically to the Choteau NTMS 1:250,000 scale Quadrangle, Montana, one of a group of 12 such quadrangles in Arizona, Idaho, Montana, New Mexico, South Dakota, and Washington included in an aerial radiometric and magnetic reconnaissance survey. General information concerning the instrumentation and methods used in data acquisition, processing, and interpretation is presented in Volume 1 of this final report.

From abstract: Between mid-May and late June 1976, 3409 water and water-transported sediment samples were collected from 1781 locations spread over an approximate 17 000 kilometer area of northwestern Montana. All of the samples were analyzed for total uranium at the LASL, using standardized procedures and rigorous quality controls--the waters by fluorometry and the sediment (and those waters with >10 parts per billion uranium) by delayed-neutron counting methods.

Abstract: An airborne radiometric survey of parts of the east flank of the Big Horn Mountains was begun on June 23, and completed on August 27, 1952. An area of approximately 250 square miles was covered, and only two anomalies were found in the entire area. Flight lines were arranged in accordance with the geology of the area, particular attention being given to formations the stratigraphic equivalents of which are known to be uranium bearing in other areas. Two additional zones of radioactivity were found by ground investigation, but assays from both the ground and the airborne discoveries showed no economic uranium deposits.

Introduction: During the year 1952-1953, research on the Boulder batholith program was largely devoted to basic mineralogy studies of the "siliceous reef" and, to the extent possible at that time, the "base metal" deposits.

The objective of the study was to evaluate the favorability for potential uranium resources in Tertiary and related strata. Past studies indicate that the Tertiary basins in southwestern Montana are worthy of further investigation because (1) several basins contain a thick sequence of continental sedimentary rocks, (2) several basins are near possible granitic source rocks that have known uranium occurrences, and (3) some of the Montana basins are geologically similar to basins in Wyoming that are host to important sandstone-type deposits. This study focuses on sedimentary rocks of Tertiary age, but includes some rocks of Late Cretaceous and Pleistocene ages. In some areas only a portion of the total Tertiary sedimentary section could be studied because of poor surface exposures and limited subsurface information.

Report describing the results of geochemical and stream sediment reconnaissance sampling in the Sandpoint Quadrangle, to look for uranium and trace elements, and to take other measurements.

Appendix containing geological survey averages data to accompany an aerial gamma ray and magnetic survey of the Hailey, Idaho Falls, Elk City quadrangles of Idaho and Montana, and the Boise quadrangle in Oregon and Idaho.

Appendix containing single record geological survey data of the Idaho Falls quadrangle to accompany an aerial gamma ray and magnetic survey of the Hailey, Idaho Falls, Elk City quadrangles of Idaho and Montana, and the Boise quadrangle of Oregon and Idaho.

Appendix containing averages of geological data taken in the Idaho falls quadrangle to accompany an aerial gamma ray and magnetic survey of the Hailey, Idaho Falls, Elk City quadrangles of Idaho and Montana, and the Boise quadrangle of Oregon and Idaho.

Appendix containing single record geological survey data of the Hailey quadrangle to accompany an aerial gamma ray and magnetic survey of the Hailey, Idaho Falls, Elk City quadrangles of Idaho and Montana, and the Boise quadrangle of Oregon and Idaho.

Appendix containing average geological survey data of the Boise quadrangle to accompany an aerial gamma ray and magnetic survey of the Hailey, Idaho Falls, Elk City quadrangles in Idaho and Montana and the Boise Quadrangle in Oregon and Idaho.

Appendix containing single record geological survey data of the Boise quadrangle to accompany an aerial gamma ray and magnetic survey of the Hailey, Idaho Falls, Elk City quadrangles in Idaho and Montana and the Boise Quadrangle in Oregon and Idaho.

Appendix containing averages of geological survey data gathered at the Hailey quadrangle to accompany an aerial gamma ray and magnetic survey of the Hailey, Idaho Falls, Elk City quadrangles of Idaho and Montana, and the Boise quadrangle of Oregon and Idaho.