The Chandler Tunnel is a gold and silver mine located in Rio Grande county, Colorado at an elevation of 11,499 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 11,499 Feet (3,505 Meters)
Commodity: Gold, Silver
Lat, Long: 37.42889, -106.60056
Map: View on Google Maps
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Chandler Tunnel MRDS details
Site Name
Primary: Chandler Tunnel
Secondary: Claim: Little Ida
Secondary: Ms 67
Commodity
Primary: Gold
Primary: Silver
Secondary: Copper
Location
State: Colorado
County: Rio Grande
District: Summit (Summitville) District
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Type: Underground
Ownership
Owner Name: General Minerals Corp.
Home Office: Grand Junction
Years: 1957 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1875
Year Last Production: 1957
Discovery Year: 1876
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Not available
Structure
Type: R
Description: San Juan Volcanic Field
Type: L
Description: Platoro Caldera, Summitville Caldera, Summitville Fault, South Mountain Dome
Alterations
Alteration Type: L
Alteration Text: Quartz-Alunite Solfataric Alteration
Rocks
Name: Quartz Latite
Role: Associated
Age Type: Host Rock
Age Young: Miocene
Name: Quartz Latite
Role: Associated
Age Type: Associated Rock
Age Young: Miocene
Analytical Data
Analytical Data: 11-TON CRUDE ORE SHIPMENT IN 1929 CONTAINED 1.8 OZ/TON AU, 18 OZ/TON AG, 16.9% CU
Materials
Ore: Tennantite
Ore: Covellite
Ore: Chalcopyrite
Comments
Comment (Deposit): MINE DEVELOPED PRINCIPALLY ON LITTLE ANNIE VEIN ZONE, MOST EXTENSIVELY DEVELOPED VEIN AND LARGEST AU PRODUCER IN DISTRICT. DEPOSIT IS NW-SE-TRENDING, NEARLY VERTICAL, IRREGULARLY TABULAR MASS OF LIMONITE-STAINED, HIGHLY SILICIFIED ROCK, ALMOST ENTIRELY VUGGY QUARTZ WITH LOCAL SELVAGES OR INCLUSIONS OF QUARTZ-ALUNITE ROCK. ZONE APPARENTLY ENDS ON SE NEAR WINCHESTER PORTAL. NE-TRENDING CROSS-FRACTURES REFLECTED BY PROJECTIONS OF SILICIFIED ROCK AND ELONGATED PIPES, SUCH AS ANNIE BELLE VEIN EXTENDING SW FROM ANNIE OPEN CUT. HIGHLY OXIDIZED ORE (AURIFEROUS LIMONITE) STOPED ABOVE IDA LEVEL, SOME MINED BETWEEN IDA AND CHANDLER LEVELS. UNOXIDIZED AU-CU SULFIDE ORE ON CHANDLER LEVEL AND AS DEEP AS REYNOLDS LEVEL BUT CONTINUITY UNKNOWN. CHANDLER LEVEL ALSO DEVELOPS DEXTER (ODIN) VEIN TO MINOR EXTENT.
Comment (Workings): TUNNEL DRIVEN GENERALLY SOUTHWARD FOR 520 FT. THENCE BRANCHING INTO THREE DRIFTS DRIVEN SE INTO LITTLE ANNIE VEIN ZONE. SMALL BRANCH TUNNEL DRIVEN EAST INTO DEXTER (ODIN) VEIN ZONE. IDA SHAFT FROM SURFACE DRIVEN THROUGH CHANDLER LEVEL ABOUT 840 FT SSE OF PORTAL.
Comment (Location): AT NORTH BASE OF SOUTH MTN. PORTAL ELEV FROM STEVEN AND RATTE (1960, PL. 4). ; INFO FROM LAND.ST :1975
References
Reference (Deposit): LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHEASTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-828.
Reference (Deposit): BLM MINERAL SURVEY MS 67
Reference (Deposit): COLORADO DIV. MINES INF. REPT. AND ANNUAL OPERATOR REPTS.
Reference (Deposit): PATTON, H.B., 1917, GEOLOGY AND ORE DEPOSITS OF THE PLATORO-SUMMITVILLE MINING DISTRICT, COLORADO: CGS BULL. 13.
Reference (Deposit): STEVEN, T.A., AND RATTE, J.C., 1960, GEOLOGY AND ORE DEPOSITS OF THE SUMMITVILLE DISTRICT, SAN JUAN MOUNTAINS, COLORADO: USGS PROF. PAPER 343
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