Keystone, South Dakota
The Maderposen Lode is near Keystone, South Dakota. Historically the site has been associated with the Keystone Mining District which is now part of the Black Hills National Forest. The Maderposen Lode was closed at the time of data entry with no known plans to re-open. The Black Hills of the Interior Plains characterize the geomorphology of the surrounding area.
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Additional textual information about a site or mine.
Formal or informal mining district names.
Physiographic area where the resource is found.
Other deposits in the same region.
Maderposson Feldspar Occurrence
Big Smoke Group
Soda Spar Lode
Mountain Lion Mine
Beryllium Feldspar Mine
Glendale Gp Beryllium Prospect
Glendale Tin Mine
Fern Cliff Prospect
* 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.
Learn more about the Bureau of Land Management, Public Land Survey System, and mining claims.
Understanding Claim Ownership
We receive lots of emails from people who find their name or a relative’s name on our site and want to know if this means they have some right to the land listed under that name.
Understanding BLM Administrative Areas
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Understanding Location Data
Mine handled by the Bureau of Land Management are not mapped by latitude and longitude, instead, these mines harken back to the Public Land Survey System.
A “township” can refer to two different things. Both are part of the PLSS measurement system but have different uses.
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