Custer, South Dakota
The Evergreen Group is near Custer, South Dakota. Historically the site has been associated with the Custer Mining District which is now part of the Black Hills National Forest. The Evergreen Group was closed at the time of data entry with no known plans to re-open. Production size when active was considered to be small. The ore mined is composed of beryl, microcline and feldspar with waste material consisting primarily of quartz. The ore is found in dikes of unknown dimensions. The host rock in this area is pegmatite. The Black Hills of the Interior Plains characterize the geomorphology of the surrounding area.
Additional textual information about a site or mine.
Formal or informal mining district names.
TWO OF THE CLAIMS HAVE BEEN EXPLORED WITH OPEN CUTS.
Characteristics of the ore body.
Geological materials at the site.
Tectonic setting in which the site or deposit is situated.
Physiographic area where the resource is found.
Other deposits in the same region.
Beecher Lithium Mine
Long View Mine
Lofton Beryllium Mine
Dyke Feldspar Mine
Black Diamond Mine
Custer Mountain Mine
Snookum Feldspar Mine
* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.
** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.
1 World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.
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THREE UNPATENTED CLAIMS