Century Lode Claim
Hill City, South Dakota
The Century Lode Claim 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 Century Lode Claim was closed at the time of data entry with no known plans to re-open. Production size when active was considered to be small. The ore mined is composed of cassiterite, spodumene and amblygonite with waste material consisting primarily of microcline, quartz and albite. The ore is found in dikes 243 meters (800 feet) long and 15 meters (50 feet) wide. Associated rock in this area is pegmatite 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.
Formal or informal mining district names.
SEVERAL OPEN PITS AND CUTS, THREE SHAFTS, EXTENSIVE TRENCHING AND DRILLING OF THE NORTHERN DIKE.
SPODUMENE CRYSTALS AVERAGING 0. 5 BY 1 BY 6 INCHES.
Characteristics of the ore body.
Geological materials at the site.
Tectonic setting in which the site or deposit is situated.
Physiographic area where the resource is found.
Other deposits in the same region.
Mateen Open Pit Lithium Mine
Hill City Tungsten Site
Hill City District
Gertie Tin Mine
Gertie Tin Mine
Tin Chance Tin Occurrence
Tin Chance Tungsten Prospect
White Whale Group
* 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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TWO PRINCIPAL PEGMATITE DIKES, EACH DIKE IS COMPOSED OF THREE ZONES. NORTHERN-MOST DIKE IS IRREGULAR BELOW THE SURFACE AND EXTENDS 100 TO 200 FEET IN DEPTH. THE SOUTHERN DIKE IS WELL EXPOSED FOR 300 FEET THE HANGING WALL IS EXPOSED IN A SHAFT NEAR THE SOUTH END TO A DEPTH OF ABOUT 65 FEET. ONE 20 ACRE PATENTED LODE CLAIM.