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- W1514758093 abstract "The Steens and Pueblo mountain ranges together form a shallow crescent of northerly trend in the eastern part of Harney County, Oreg. They contain more than 15 quicksilver prospects and a few that were opened for gold and copper. Most of the area is underlain by flexed and faulted Tertiary lava, but preTertiary metamorphic and igneous rocks are exposed in the southern part. Part of the eastern flank of the mountains consists of somewhat deformed alluvial deposits, which are younger than the lava but older than the lacustrine and alluvial deposits on the valley floors. The lavas along the east side of the mountains have undergone rather extensive hydrothermal alteration. At intervals for a distance of about 30 miles they contain mineralized fracture zones, in most of which mercurial tetrahedrite and cinnabar are the principal valuable minerals. The pre-Tertiary rocks in the southern part of the mountains also contain lodes; These were first explored for gold and copper, but locally they contain quicksilver as well. Although the presence of quicksilver deposits in the Steens ' and Pueblo Mountains has been known for 40 years, they have been very little explored and probably less than 10 flasks of quicksilver has been produced from them. The lodes on the whole are of low grade, although they contain rich pockets, some of which may have formed in the zone of weathering. The low average tenor, coupled with the large size of some of the lodes and the metallurgical problems introduced by the unusual mineralogy, suggest that the area may be better adapted to exploration by large, well-equipped organizations than to working by individual operators. If keen demand for quicksilver continues, this region should be considered as a possible source of supply." @default.
- W1514758093 created "2016-06-24" @default.
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- W1514758093 date "1941-01-01" @default.
- W1514758093 modified "2023-09-26" @default.
- W1514758093 title "Quicksilver deposits in the Steens and Pueblo Mountains, southwestern Oregon" @default.
- W1514758093 doi "https://doi.org/10.3133/ofr412" @default.
- W1514758093 hasPublicationYear "1941" @default.
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