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SAN JOAQUIN ROADLESS AREA, CALIFORNIA.

Geological Survey Professional Paper (United States)

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and

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Abstract

The San Joaquin Roadless Area is composed of three noncontiguous areas on the eastern side of the Sierra Nevada in Madera County, California. The results of geologic, geochemical, and mining-activity and production surveys in the central part of the area indicate little promise for the occurrence of metallic-mineral or energy resources in the area. Sand, gravel, and pumice exist in the area but occurrences are small and isolated and farther from major markets than similar deposits outside the roadless area. Rocks in the area are exhibited in exposures of unaltered and nonmineralized granitic and metavolcanic rock along the steep western wall of the glacially carved valley of the Middle Fork of the San Joaquin River. Drainage in the area consists of seeps along fractures in the cliff or small cascading streams, a hydraulic setting not favorable for the development of placer deposits. No mines or prospect workings were found in the roadless area. Alteration zones within the granitic and metamorphic rock that crop out within the area are small, isolated, and consist only of limonitic staining and bleached quartzose rock.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
SAN JOAQUIN ROADLESS AREA, CALIFORNIA.
Series title:
Geological Survey Professional Paper (United States)
Volume
1
Year Published:
1984
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geological Survey Professional Paper (United States)
First page:
350
Last page:
352
Number of Pages:
3