The Duffields Deposit is a fluorine-fluorite mine located in El Paso county, Colorado at an elevation of 9,229 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: 9,229 Feet (2,813 Meters)
Commodity: Fluorine-Fluorite
Lat, Long: 38.73833, -104.90861
Map: View on Google Maps
Duffields Deposit MRDS details
Site Name
Primary: Duffields Deposit
Secondary: Hughes Boss Shaft and Leyte Open Pit
Secondary: Claims: Hughes Boss, MS 14464
Secondary: Leyte, MS 20742
Commodity
Primary: Fluorine-Fluorite
Secondary: Lead
Secondary: Zinc
Secondary: Gold
Secondary: Silver
Location
State: Colorado
County: El Paso
District: Cheyenne (St. Peters Dome) 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
Not available
Ownership
Owner Name: Kramer Mines, Inc.
Home Office: Denver, Co.
Years: 1945 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year First Production: 1910
Year Last Production: 1945
Discovery Year: 1901
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
Not available
Orebody
Not available
Structure
Type: R
Description: Front Range Uplift, Pikes Peak Batholith
Type: L
Description: Mt Rosa Intrusive Center, Ute Pass Fault, Manitou Park Half Graben
Alterations
Alteration Type: L
Alteration Text: Wallrock Silicification
Rocks
Name: Granite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Name: Granite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic
Analytical Data
Not available
Materials
Ore: Galena
Ore: Sphalerite
Ore: Fluorite
Gangue: Quartz
Gangue: Barite
Comments
Comment (Production): PART OF TOTAL PRODUCTION BY KRAMER MINES FROM TIMBERLINE, DUFFIELDS (LEYTE OPEN PIT), AND MATTIE B. IN 1944-45.
Comment (Location): ALONG GOLD CAMP ROAD 0.6 MILE SSE OF ST. PETERS DOME. ELEV AND LAT-LONG GIVEN ARE FOR HUGHES BOSS SHAFT SOUTH OF ROAD IN SEC. 20. ; INFO FROM LAND.ST :(1981)
Comment (Commodity): AU AND AG OCCURRENCE AND MINOR RECOVERY ASSUMED ON BASIS OF HISTORICAL INFORMATION FOR DISTRICT.
Comment (Development): HUGHES BOSS CLAIM WAS SITE OF FIRST FLUORSPAR PRODUCED IN DISTRICT, 1910-11. INACTIVE UNTIL WW II. REOPENED IN 1944 WITH MOST OF PRODUCTION COMING FROM LEYTE OPEN PIT.
Comment (Deposit): COUNTRY ROCK OF PIKES PEAK GRANITE INTRUDED BY SMALL STOCKS AND PLUGS OF FAYALITE GRANITE AND CUT BY N 35 TO 50 W-TRENDING PRECAMBRIAN APLITE DIKES AND BY ARCUATE NE-TRENDING FAULT SUBCONCENTRIC ON SOUTH SIDE OF MT ROSA INTRUSIVE CENTER. VEIN CONSISTS OF FLUORSPAR WITH BRECCIA FILLING OF FINELY GRANULAR QUARTZ AND SOME GALENA AND SPHALERITE (FIRST AND SECOND STAGES OF VEIN DEPOSITION). VEIN LOCALIZED AT BEND IN CROSS-CUTTING FAULT. SOUTH OF BEND, VEIN TRENDS N 20 E, 65 NW, AND NORTH OF BEND TREND IS N 70 W. FARTHER NORTHWARD AT LEYTE OPEN PIT, TREND CHANGES TO NORTHERLY WITH 70 W DIP. HIGHEST GRADE FOUND IN HANGING WALL.
Comment (Workings): HUGHES BOSS (TWO) SHAFTS, LEYTE OPEN PIT
References
Reference (Deposit): TRIMBLE, D.E., AND MACHETTE, M.N., 1979, GEOLOGIC MAP OF THE COLORADO SPRINGS-CASTLE ROCK AREA, FRONT RANGE URBAN CORRIDOR, COLORADO: USGS MAP I-857-F.
Reference (Deposit): FINLAY, G.I., 1916, DESCRIPTION OF THE COLORADO SPRINGS QUADRANGLE: USGS FOLIO 203.
Reference (Deposit): STEVEN, T.A., 1949, GEOLOGY AND FLUORSPAR DEPOSITS OF THE ST. PETERS DOME DISTRICT, COLORADO: COLORADO SCI. SOC. PROC., V. 15, NO. 6, P. 259-284.
Reference (Deposit): PEARL, R.M., 1965, COLORADO GEM TRAILS AND MINERAL GUIDE: DENVER, SAGE BOOKS, P. 171-180.
Reference (Deposit): OVER, EDWIN, JR., 1929, SOME MINERAL LOCALITIES OF EL PASO COUNTY: ROCKS AND MINERALS, V. 4, NO. 4, P. 106-107.
Reference (Production): STEVEN, 1949
Colorado Mining Photos
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