Geology of the Eureka pegmatite, Pennington County, South Dakota
Open-File Report
54-256
By: Roy Eldon Roadifer
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- Figure: Figure 1 (pdf)
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Abstract
The Eureka Pegmatite, two miles southeast of Keystone, Pennington County, South Dakota, is a small but possibly valuable zoned body containing more than 85,000 tons of coarse-grained granite-pegmatite rock.
The mica in the pegmatite is probably not of any great importance, but the potash feldspar and beryl may comprise a considerable tonnage of valuable reserves. If the pegmatite can be exploited at a profit in spite of the graphite-damaged feldspar, it may yield substantial amounts of strategically important beryl by open-cut mining of the entire body.
This report contains complete, megascopic mineralogical and structural details of the pegmatite, which are supplemented with drill core logs and a geologic map and cross-sections.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Geology of the Eureka pegmatite, Pennington County, South Dakota |
| Series title | Open-File Report |
| Series number | 54-256 |
| DOI | 10.3133/ofr54256 |
| Year Published | 1954 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | Report: 29 p.; 1 Figure: 37.58 x 30.39 inches |
| Country | United States |
| State | South Dakota |
| County | Pennington County |