Report issued by the U.S. Bureau of Mines discussing metal mines in Colorado. As stated in the summary, "this paper describes the mineral deposits and discusses mining and milling methods and related operating conditions in an important gold, silver, lead, and zinc producing area in Ouray, San Juan, and San Miguel Counties, Colo., embracing 250 square miles" (p. 5). This report includes tables, maps, and illustrations.

From abstract: A reconnaissance radiometric survey of parts of the northwestern San Juan Mountains has revealed the occurrence of uranium-bearing ores in several mining districts in Ouray and San Juan Counties, and the occurrence of thorium-bearing veins in southwestern Gunnison County.

Photograph of Carol Williams sitting next to a sign that reads "Engineer Mountain Elevation 13,190 ft." in Colorado. She looks to the side with a blank expression on her face. She wears sunglasses, biker shorts, a coat, a collared shirt, and thick socks. Mountains are visible in the background.

Photograph of an unknown man sitting on a large rock on Engineer Mountain in Colorado. He sits with his arms around his knees and looks away from the camera. He wears boots, khakis, a hat, and a long-sleeve shirt. Mountains are visible in the background.

Photograph of Pam and Byrd IV sitting next to a sign that reads "Engineer Mountain Elevation 13,190 ft." in Colorado. Another man can be seen sitting near them and looking out at the landscape. A cross can be seen next to the mountain sign. Mountains are visible in the background.

Photograph of Pam Williams standing on Engineer mountain in Colorado. She looks at the camera and squints. Pam is wearing an oversized red and black plaid coat with flip flops. She wears her hair in pigtails. Mountains are visible in the background.

The following report covers a study of the electrical properties of the Morrison formation in the Uravan mineral belt of the Colorado Plateau province where it is indicated that there is a significant correlation between electrical resistivity and the relative favorability for occurrence of ore. This report presents the measurements of resistivity trends.

Report issued by the Bureau of Mines over exploration of lead-zinc deposits in Colorado. The geology, location, and physical features of the deposits are discussed. This report includes tables, maps, photographs, and illustrations.