The following report provides results taken from more than 600 samples found in Alaska, mostly concentrates from placer operations, that were tested for radioactivity during January 1945 in the laboratory of the Geological Survey.

The following report provides findings of trace elements from investigations on Cache and upper Peters Creeks in the Tentana District, Alaska after discovering radioactive minerals within Geological Survey's collection of Alaskan placer deposits. This investigation took place in the summer of 1945.

The following report provides information and findings of trace elements recognized in a few placer concentrates from Sweepstakes and Rube Creeks in the Koyuk district of eastern Seward Peninsula, Alaska when old collections were scanned for radioactivity in the spring of 1945.

Report discussing the U.S. Geological Survey's investigation of possible radioactive material sources in placer-mining areas and bedrock exposures near Teller, Alaska. This investigation was done during June and July of 1946.

Report discussing the U.S. Geological Survey's investigation of radioactive trace elements along the highways in Tanana and upper Copper River valleys.

Report discussing the U.S. Geological Survey's investigation of radioactive materials in the Serpentine-Kougarok on the Seward Peninsula of Alaska.

Report discussing the U.S. Geological Survey's investigation of radioactive element samples found in the Candle Creek area on the Seward Peninsula of Alaska.

Abstract: "The highest radioactivity value obtained in a traverse of shales in the Middle Paleozoic section of the lower Coleen River is 0.003 percent equivalent uranium. Traverses on pre-Cambrian schists at Rabbit Mountain were made with negative results."

A report regarding a Trace Elements Reconnaissance of the Southern Highway Belt, in South-Central Alaska.

Abstract: Two uranium-bearing minerals, uranothorianite and thorite (?), were found in the stream gravels of the main branch of the South Fork of Quartz Creek, a tributary of the Kiwalik River. Although the bedrock source of the minerals was not located, the radioactive material was traced in slope wash well above the stream gravel. A detailed investigation of the area with more sensitive counters might reveal the source of the minerals and localities where the minerals are sufficiently concentrated to be minable.

Abstract: "Two uranium-bearing minerals, uranothorianite and thorite(?), were found in the stream gravels of the main branch of the South Fork of Quartz Creek, a tributary of the Kiwalik River. Although the bedrock source of the minerals was not located, the radioactive material was traced in slope wash well above the stream gravel. A detailed investigation of the area with more sensitive counters might reveal the source of the minerals and localities where the minerals are sufficiently concentrated to be minable."

The following report covers investigations on radioactivity in copper-bearing iron oxide mineralization fissures and fractures in narrow zones within Kobuk River Valley, Alaska.

Report discussing the study of radioactivity and mineralogy of 24 placer concentrate samples from the Fortymile district of east-central Alaska. Only two samples showed significant radioactivity due to uraniferous thorianite. Sections include geology, and radiometric and mineralogic studies.

Abstract: "As a result of inquiries by prospectors in 1948 concerning radioactive ores in the vicinity of Jakolof Bay on the Kenai Peninsula in southern Alaska, the Geological Survey conducted a brief investigation during 1949. No radioactive material was found. Possibly a chromite stockpile in this locality was mistaken for pitchblades."

The following report discusses radioactive results found in 4 samples of gneissic granite of 13 samples collected from the Mount Michelson area of northeastern Alaska. A mineralogic study of all heavy-mineral fractions having more than 0.01 percent equivalent uranium indicates that the radioactive material apparently is confined to biotite, which in one sample contains 1.19 percent uranium.

The following report presents results of radiometric and mineralogic studies made on 13 samples taken from the Mount Michelson area, Alaska.

Abstract: A suite of 50 rock specimens, collected by the 1947 Washburn Mount McKinley Expedition, was scanned radiometrically. The maximum radioactivity observed in any one of the specimens was about twice background. Radiometric analyses of the most radioactive samples show that a sample of vein quartz coated with manganese oxide contains 0.009 percent equivalent uranium and that the maximum equivalent uranium content of granitic rock types is .004 percent. The radioactivity of the manganese-stained quartz is probably due to traces of uranium in the manganese mineral, whereas that of the granitic rocks is due to radioactive accessory minerals.

Report discussing a study in which a suite of 50 rock specimens collected by the 1947 Washburn Mount McKinley Expedition was scanned radiometrically.

A report regarding a reconnaissance performed Along the Upper Porcupine River, Northeastern Alaska for radioactive deposits.

Report discussing the findings of a geological field examination of the Willow Creek mining district of south-central Alaska in 1949.

This report discusses a field examination made to search for radioactive pegmatite materials located in the Willow Creek Mining District in South Central Alaska.

Report discussing the uranium-containing radioactive granite of the Miller House-Circle Hot Springs area of east-central Alaska.

A report regarding radioactive granite located in the Miller House-Circle Hot Springs area, in East-Central Alaska. This report contains work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.

Report discussing the U.S. Geological Survey's investigation of radioactive mineral deposits found in the Buckland-Kiwalik district on the Seward Peninsula of Alaska. Uranothorianite, as well as other radioactive minerals, were discovered in the area.