El Dorado Custer County Silver Mine
Custer, South Dakota
The El Dorado Custer County Silver Mine 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 El Dorado Custer County Silver Mine was closed at the time of data entry with no known plans to re-open. Production size when active was considered to be small. Mine operations consist of surface and underground workings. There is one known shaft. Subsurface depth reaches a maximum of 43 meters (140 feet) and extends 1,280 meters (4,200 feet) in length. The ore mined is composed of silver and gold with waste material consisting primarily of quartz. The ore body extends 2.44 meters (8.01 feet) in width. The host rock in this area is schist. The Black Hills of the Interior Plains characterize the geomorphology of the surrounding area.
Additional textual information about a site or mine.
10 PATENTED CLAIMS. QUARTZ FISSURE VEINS CUT OBLIQUELY ACROSS HOST ROCKS.
Formal or informal mining district names.
Workings at the site.
MAIN SHAFT IS 6 X 8 FEET
Characteristics of the ore body.
Geological materials at the site.
Physiographic area where the resource is found.
Controls on emplacement of ore such as faults or other structural features.
Other deposits in the same region.
Old Bill Mine
Milton Lithium Mine
Wilhelm Niobium (Columbium) Mine
Czar Tin Mine
Black Diamond Pennington County Tungsten Occurrence
Pine Tree Gold Mine
Golden Crown Mine
Black Diamond Mine
Kirka Downing Claim
* 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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RICHEST GOLD ORE IS NEAR THE HANGING WALL.