General Harney Tin Mine
Hill City, South Dakota
The General Harney Tin Mine is near Hill City, South Dakota. Historically the site has been associated with the Hill City Mining District which is now part of the Black Hills National Forest. The General Harney Tin 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 30 meters (100 feet). The ore mined is composed of beryl, cassiterite and mica with waste material consisting primarily of quartz. The ore is found in dikes 73 meters (239 feet) long and 4 meters (14 feet) wide. The Black Hills of the Interior Plains characterize the geomorphology of the surrounding area.
Additional textual information about a site or mine.
A QUARTZ VEIN CARRIES CASSITERITE & BERYL. ALSO, 2 SMALLER DIKES.
NE 1/4; ADJACENT TO THE MOHAWK GROUP
Formal or informal mining district names.
Workings at the site.
100 FEET SHAFT WITH SEVERAL HUNDRED FEET OF DRIFTING AND CROSSCUTTING, ALSO SOME SMALLER SHAFTS AND PITS.
Characteristics of the ore body.
Physiographic area where the resource is found.
Other deposits in the same region.
Cassiterite Tin Prospect
Tin Boom Mine
Annie Tungsten Mine
Campaign Tin Mine
Tin Spike Mine
Mohawk Tin Mine
Liberty Bell Tin Occurrence
* 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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CASSITERITE OCCURS IN FELDSPAR AND ASSOCIATED WITH MICA.