The Exchequer Tunnel is near Creede, Colorado. Historically the site has been associated with the Creed Mining District which is now part of the Rio Grande National Forest. The Exchequer Tunnel is a underground mining operation. Mine operations consist of underground workings. There is one known shaft. Subsurface length extends a maximum of 625 meters (2,050 feet). The ore mined is composed of silver with waste material consisting primarily of quartz, barite and limonite. The ore body extends 73 meters (239 feet) in length. Associated rock in this area is rhyolite from the Oligocene epoch 33.90 to 23.03 million years ago. The Southern Rocky Mountains physiographic province of the Rocky Mountain System characterize the geomorphology of the surrounding area.
Site identification and general characteristics. Learn about USGS mines.
Additional textual information about a site or mine.
FRACTURE ZONE ALONG CONTACT BETWEEN WILLOW CREEK AND CAMPBELL MOUNTAIN RHYOLITE.
S-T-R, LAT-LONG, AND ELEV DETERMINED FROM EMMONS AND LARSEN'S (1923) TOPO MAP (1:24, 000 ). MINE OR CLAIM LIES ABOVE W. WILLOW CREEK ON SE END OF BACHELOR MOUNTAIN; INFO FROM LAND. ST : (1976).
Formal or informal mining district names.
NO WORKABLE ORE BODY ENCOUNTERED AS OF 1912.
Workings at the site.
TUNNEL TRENDS WEST AND NW APPROX. 1200 FEET DRIFT AND CROSSCUTS ALONG RHYOLITE CONTACT AND VEIN TOTAL APPROX. 850 FEET
Characteristics of the ore body.
Geological materials at the site.
Geologic structural features affecting or characterizing the site or mine.
Tectonic setting in which the site or deposit is situated.
Physiographic area where the resource is found.
Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the mine.
Other deposits in the same region.
Rio Grande Lode
Jo Jo Tunnel
* 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
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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.