| Deposit ID | 10013973 |
|---|---|
| MRDS ID | D010552 |
| Record type | Site |
| Current site name | Mason Mine |
| Alternate or previous names | Mason Ranch Mine |
| Related records | 10239742 |
| Geographic coordinates: | -105.21115, 40.50081 (WGS84) |
|---|---|
| Elevation | 1743 |
| Relative position | 9.1 MILES S51W FROM FORT COLLINS |
Political divisions (FIPS codes)
Larimer(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Horsetooth Reservoir(quadrangle 1:24,000 scale)
Fort Collins(quadrangle 1:100,000 scale)
Greeley(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Big Thompson(hydrologic unit)
South Platte(hydrologic accounting unit)
South Platte(hydrologic subregion)
Missouri(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Colorado | Larimer |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| 6th Principal | 006N | 070W | 10 | NE OF SE | Colorado |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Silver | Primary |
| Tungsten Critical | Primary |
| Materials | Type of material |
|---|---|
| Pyrite | Ore |
| Scheelite | Ore |
| Epidote | Gangue |
| Hematite | Gangue |
| Montmorillonite | Gangue |
| Quartz | Gangue |
| Result | VEIN ASSAYED 0.02 TO 0.04 OZ/TON AU, 0.4 TO 0.6 OZ/TON AG |
|---|---|
| Result | HIGHER GRADE AU ORE IN SHAFT ASSAYED 2 OZ/TON AU. |
| Host or associated | Associated | ||||||
|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Tonalite | ||||||
| Rock unit name | Tonalite | ||||||
| Rock description | Tonalite | ||||||
| |||||||
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Granitoid > Tonalite |
| Rock unit name | Tonalite;Metasedimentary Rocks--Mica Schist |
| Rock description | Tonalite;Metasedimentary Rocks--Mica Schist |
| (1) | -105.21115, 40.50081 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Front Range Uplift, Cheyenne Basin |
| Type of structure | Local |
| Structure description | Big Thompson Anticline, Milner Mountain Fault, Fletcher Hill (Buck Horn) Fault, Masonville Anticline, Buckhorn Syncline, Masonville Stock , Redstone Fault |
| Thickness | 1.22M |
|---|
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| District name | Masonville District |
|---|
| Ownership category | Federal |
|---|
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010552 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0080690098 |
WOLFE, J.A., 1953, GEOLOGY OF THE MASONVILLE MINING DISTRICT, LARIM ER COUNTY, COLORADO: COLORADO SCHOOL OF MINES M.SC. THESIS T-789.
BRADDOCK, W.A., AND OTHERS, 1970, GEOLOGIC MAP OF THE MASONVILLE QU ADRANGLE, LARIMER COUNTY, COLORADO: USGS MAP GQ-832.
COBB, H.S., 1960, TUNGSTEN MINES OF COLORADO: COLORADO METAL MINING FUND BD., P. 49.
BELSER, CARL, 1956, TUNGSTEN POTENTIAL IN CHAFFEE, FREMONT, GUNNISO N, LAKE, LARIMER, PARK, AND SUMMIT COUNTIES, COLORADO: USBM IC-7748, P . 18.
| Subject category | Comment text |
|---|---|
| Deposit | NW-TRENDING FRACTURES CONTAINED EITHER MONTMORILLONITE OR MONTMOR ILLONITE-EPIDOTE-HEMATITE-QUARTZ. MOST NE-TRENDING FRACTURES CONTAINED MONTMORILLOMITE-OR MONTMORILLONITE-EPIDOTE. PYRITE CONCENTRATIONS FOUN D AT SLIGHT CHANGES IN STRIKE ALONG N30E-TRENDING FRACTURE |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-APR-1983 | Schwochow, Stephen D. | Colorado Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.