Big Smoke Group
Keystone, South Dakota
The Big Smoke Group 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 Big Smoke 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. Mine operations consist of surface workings. There is one known shaft. The ore mined is composed of beryl and muscovite with waste material consisting primarily of siderite, quartz and tourmaline. The mineralization at this location is from the Neoproterozoic era 1.00 to 0.54 billion years ago. The Black Hills of the Interior Plains characterize the geomorphology of the surrounding area.
Additional textual information about a site or mine.
CONSISTS OF THREE UNPATENTED CLAIMS. THERE ARE SEVERAL PEGMATITE DIKES ON THE CLAIMS. THE BIG SMOKE NO. 1 IS THE ONLY ONE OF PARTICULAR PROMISE.
ADJOINS THE PUT AND BERYL CLAIMS ON THE NORTH.
Formal or informal mining district names.
Workings at the site.
CONSIST OF AN L-SHAPED OPENCUT ABOUT 25 FEET IN EACH DIMENSION.
Characteristics of the ore body.
Geological materials at the site.
Physiographic area where the resource is found.
Other deposits in the same region.
Mountain Lion Mine
Soda Spar Lode
Beryllium Feldspar Mine
Fern Cliff Prospect
Maderposson Feldspar Occurrence
Glendale Tin Mine
Glendale Gp Beryllium 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.
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BERYL OCCURS IN IRREGULAR SEGREGATIONS OF MICA.