Spokane Silver Mine
Keystone, South Dakota
43.8399°N 103.3772°W
Mine Overview
The Spokane Silver Mine is near Keystone, South Dakota. Historically the site has been associated with the Spokane Mining District which is now part of the Black Hills National Forest. The Spokane Silver Mine 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 underground workings. There is one known shaft. Subsurface depth reaches a maximum of 91 meters (300 feet). The ore mined is composed of chalcopyrite, galena and argentite with waste material consisting primarily of pyrite, vanadinite and quartz. The ore body extends 220 meters (723 feet) long and 7 meters (25 feet) thick. 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.
Owner Name and Address
Iron Mountain Development Company
- Type
- Owner
Commodities
Additional textual information about a site or mine.
- Commodity Type Importance
- Gold Metallic Primary
- Silver Metallic Primary
- Lead Metallic Secondary
- Zinc Metallic Secondary
Development
SPOKANE GROUP IS 15 CLAIMS COVERING 100 ACRES IN SECS. 26, 27 AND 35.
Workings
Workings at the site.
Underground Workings #1
- Type: Underground
- Sub Surface Depth: 91.44 Meters
Workings
THE MAIN ORE SHOOT IS DEVELOPED BY A SHAFT AND DRIFTS AT THE 60, 100, 200, AND 300 FOOT LEVELS. A SECOND SHOOT IS DEVELOPED BY A 41 FOOT RAISE AND A 50 FOOT WINCE. THE THIRD SHOOT IS UNDEVELOPED.
Geology
SILVER AND GOLD ARE ASSOCIATED WITH THE GALENA, SOME GOLD IS ALSO ASSOCIATED WITH THE PYRITE.
Orebody
Characteristics of the ore body.
- Length:
- Thickness: 7.62 meters (25.00 feet)
- Strike: east-west
- Dip: 70 north
Rocks
Geological materials at the site.
- Class? 1st Order Name? 2nd Order Name? 3rd Order Name? 4th Order Name? Most Specific Name? Begin Time End Time Description?
- Associated Rock Granite, Pegmatite Plutonic Rock Pegmatite - Pegmatite Neoproterozoic Neoproterozoic -
- Host Rock Graphitic Schist And Slates Metamorphic Rock Metasedimentary Rock Slate Slate - - -
- Mineralization - - - - - Neoproterozoic Neoproterozoic -
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?
- Fissures
Nearby Deposits
Other deposits in the same region.
-
Spokane Silver Mine
- Gold commodity Site type Mine status
- Custer, South Dakota
- Underground
- 0.02 miles
-
Beryllium Feldspar Mine
- Feldspar commodity Site type Mine status
- Custer, South Dakota
- Surface
- 0.19 miles
-
Fern Cliff Prospect
- Tungsten commodity Site type Mine status
- Custer, South Dakota
- Surface And Underground
- 0.42 miles
-
Fern Cliff Prospect
- Tungsten commodity Site type Mine status
- Custer, South Dakota
- 0.84 miles
-
Put Lode
- Beryllium commodity Site type Mine status
- Custer, South Dakota
- 1.00 miles
-
Beryllium Feldspar Mine
- Feldspar commodity Site type Mine status
- Custer, South Dakota
- 1.06 miles
-
Big Smoke Group
- Beryllium commodity Site type Mine status
- Pennington, South Dakota
- 1.23 miles
-
Soda Spar Lode
- Feldspar commodity Site type Mine status
- Pennington, South Dakota
- Surface
- 1.40 miles
-
Mountain Lion Mine
- Feldspar commodity Site type Mine status
- Pennington, South Dakota
- Surface
- 1.40 miles
-
Maderposen Lode
- Feldspar commodity Site type Mine status
- Pennington, South Dakota
- Surface
- 1.53 miles
Nearby Places
- Keystone (4.35 miles away)
- Rockerville (8.21 miles away)
- Hermosa (9.27 miles away)
- Hill City (11.74 miles away)
- Colonial Pine Hills (11.99 miles away)
- Custer (12.15 miles away)
- Fairburn (13.46 miles away)
- Johnson Siding (17.17 miles away)
- Rapid City (18.14 miles away)
- Green Valley (18.91 miles away)
- Rapid Valley (19.19 miles away)
- Silver City (19.27 miles away)
- Pringle (19.30 miles away)
- Blackhawk (21.77 miles away)
- Summerset (24.24 miles away)
- Buffalo Gap (24.27 miles away)
Nearby Mining Districts
- Spokane Mining District (0 miles away)
- Keystone Mining District (1.19 miles away)
- Ivanhoe Mining District (4.42 miles away)
Nearby Lands
- Black Hills National Forest (0 miles away)
- Black Elk Wilderness (1.26 miles away)
- Mount Rushmore National Memorial (3.85 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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Understanding Location Data
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Understanding Townships
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Deposit
THREE ORE SHOOTS ARE PRESENT ALONG THE FISSURE VEIN WHICH IS CONFORMABLE WITH THE ENCLOSING SCHIST, EXCEPT WHERE IT CUTS A SMALL PEGMATITE.