Aerial gamma ray and magnetic survey, Montrose detail Area 5, Colorado. Final report

Technical Report · Tue Apr 01 00:00:00 EST 1980

OSTI ID:5087141

The Montrose Detail Area No. 5 consists of a 180 square mile area covering portions of the West Elk Mountains, the Ruby Range, and associated mountainous regions of the Southern Rocky Mountains. The area's geology is dominated by Tertiary intrusive and extrusive rocks related to the West Elk Mountains Volcanic Province. Some exposures of underlying Tertiary and Cretaceous material are present. The Irwin Mining District (Anthracite) lies within the detail area, as well as several small prospects for zinc, lead, and silver. No uranium occurrences are known to be associated with these mineralized areas. A total of 26 groups of samples in the uranium window constitute anomalies as defined in Volume I. These anomalies lie over the highest uranium count rate areas in the Ruby Range, the Anthracite Range, and the East Beckwith Mountain area. The highest count rates appear associated with dikes of granodiorite and/or white quartz porphyry. Magnetic data outline the major intrusive and extrusive bodies in the south, but only partially define the intrusive complex to the north. Little correlation with the radiometric data was expected or observed. Despite a wide range in the count rates of the three radioisotopes, the area appeared to be geochemically homogeneous according to the criteria set forth in Volume I. Other methods of separating geochemically distinctive areas may be more successful. Multivariate analysis showed a high degree of correleation between the three isotopes.

• Research Organization: EG and G GeoMetrics, Sunnyvale, CA (USA)
• DOE Contract Number: AC13-76GJ01664
• OSTI ID: 5087141
• Report Number(s): GJBX-212(80)(Vol.2)(AREA5); TRN: 80-017706
• Country of Publication: United States
• Language: English

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