Grand Junction And Hartford Group
Custer, South Dakota
43.8485°N 103.6727°W
Mine Overview
The Grand Junction And Hartford Group is near Custer, South Dakota. Historically the site has been associated with the Custer Mining District which is now part of the Black Hills National Forest. The Grand Junction And Hartford 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 and underground workings. There is one known shaft. Subsurface depth reaches a maximum of 40 meters (130 feet). The ore mined is composed of silver and gold with waste material consisting primarily of sphalerite, pyrrhotite and quartz. The ore body is described as irregularly shaped and 4 meters (14 feet) thick. The host rock in this area is schist 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.
Owner Name and Address
C. C. Crary
- Type
- Owner
Commodities
Additional textual information about a site or mine.
- Commodity Type Importance
- Gold Metallic Primary
- Silver Metallic Primary
Development
2 UNPATENTED 10 ACRE CLAIMS; 40-STAMP MILL.
Workings
Workings at the site.
Workings #1
- Type: Surface and Underground
- Surface Length: 60.96 Meters
- Surface Width: 22.86 Meters
- Sub Surface Depth: 39.62 Meters
Workings
70 FEET DEEP; SEVERAL SMALLER CUTS, TWO ADITS & A SHAFT.
Orebody
Characteristics of the ore body.
- Thickness: 4.57 meters (14.99 feet)
- Strike: north 5 west
- Dip: steeply west
Rocks
Geological materials at the site.
Physiography
Physiographic area where the resource is found.
- Division Province? Section
- Interior Plains Great Plains Province Black Hills
Ore Control
Controls on emplacement of ore such as faults or other structural features.
- Text?
- Quartz Dikes
Nearby Deposits
Other deposits in the same region.
-
Grand Junction Gold Mine
- Gold commodity Site type Mine status
- Custer, South Dakota
- Underground
- 0.02 miles
-
Black Diamond Mine
- Mica commodity Site type Prospect status
- Custer, South Dakota
- Underground
- 0.74 miles
-
Kirka Downing Claim
- Tungsten commodity Site type Mine status
- Custer, South Dakota
- 0.95 miles
-
Black Diamond Pennington County Tungsten Occurrence
- Tungsten commodity Site type Occurrence status
- Custer, South Dakota
- Vein
- 1.44 miles
-
Wilhelm Niobium (Columbium) Mine
- Niobium (Columbium) commodity Site type Mine status
- Custer, South Dakota
- Surface And Underground
- 1.50 miles
-
Turk Group
- Gold commodity Site type Mine status
- Custer, South Dakota
- Underground
- 1.51 miles
-
Milton Lithium Mine
- Lithium commodity Site type Prospect status
- Custer, South Dakota
- Surface
- 1.62 miles
-
Tenderfoot Group
- Tin commodity Site type Prospect status
- Custer, South Dakota
- Underground
- 1.76 miles
-
Tenderfoot Spud Lode
- Lithium commodity Site type Prospect status
- Custer, South Dakota
- Surface
- 1.80 miles
-
Deacon Wright Tin Occurrence
- Tin commodity Site type Occurrence status
- Pennington, South Dakota
- Surface
- 1.82 miles
Nearby Places
- Custer (6.75 miles away)
- Hill City (7.56 miles away)
- Keystone (13.08 miles away)
- Pringle (17.04 miles away)
- Silver City (17.17 miles away)
- Rockerville (17.37 miles away)
- Rochford (19.20 miles away)
- Johnson Siding (20.06 miles away)
Nearby Mining Districts
- Custer Mining District (0 miles away)
- Oreville Mining District (1.75 miles away)
- Copper Mountain Area (2.04 miles away)
- Hill City Mining District (3.24 miles away)
Nearby Lands
- Black Hills National Forest (0 miles away)
- Black Elk Wilderness (4.92 miles away)
Footnotes
* 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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Deposit
ORE OCCURS IN BRECCIATED ZONE ALONG THE HANGING WALL SIDE OF A LARGE IRREGULAR QUARTZ DIKE TRACED AS A CONSPICUOUS OUTCROP FOR 2 MILES.