| Deposit ID | 10107993 |
|---|---|
| MRDS ID | D010561 |
| Record type | District |
| Current site name | Masonville District |
| Related records | 10191534 |
| Geographic coordinates: | -105.21087, 40.48692 (WGS84) |
|---|---|
| Elevation | 1768 |
| Relative position | 9 MILES S50W FROM FORT COLLINS |
Political divisions (FIPS codes)
Larimer(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Masonville(quadrangle 1:24,000 scale)
Estes Park(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 | 10,11 | E2 (10); W2 (11) | Colorado |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Silver | Primary |
| Tungsten Critical | Secondary |
| Copper | Tertiary |
| Nickel Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Pyrite | Ore |
| Scheelite | Ore |
| Epidote | Gangue |
| Hematite | Gangue |
| Limonite | Gangue |
| Malachite | Gangue |
| Montmorillonite | Gangue |
| Quartz | Gangue |
| Result | ASSAYS OF MASON MINE VEIN MATERIAL GAVE 0.02 TO 0.04 OZ/TON AU, 0. 4 TO 0.6 OZ/TON AG. |
|---|
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Tonalite | ||||
| Rock unit name | Tonalite;Diorite And Andesite | ||||
| Rock description | Tonalite;Diorite And Andesite | ||||
| |||||
| 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) | -105.21087, 40.48692 |
|---|
| 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 |
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1900 |
| Year of last production | 1955 |
| District name | Masonville District |
|---|
| Ownership category | Federal |
|---|
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010561 |
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.
BELSER, CARL, 1956, TUNGSTEN POTENTIAL IN CHAFFEE, FREMONT, GUNNISO N, LAKE, LARIMER, PARK, AND SUMMIT COUNTIES, COLORADO: USBM IC-7748, P . 18.
BLM MINERAL SURVEYS
VANDERWILT, J.W., 1947, MINERAL RESOURCES OF COLORADO: COLORADO MIN ERAL RESOURCES BD., P. 139.
COLORADO DIV. MINES INF. REPTS.
VANDERWILT, 1947, P. 139; BELSER, 1956, P. 18
| Subject category | Comment text |
|---|---|
| Deposit | METASEDIMENTARY ROCKS ARE LOW-GRADE REGIONALLY METAMORPHOSED TO G REENSCHIST AND EPIDOTE-AMPHIBOLITE FACIES AND ARE INTRUDED BY PRECAMBR IAN MASONVILLE TONALITE STOCK ESSENTIALLY ALONG SCHISTOSITY WITH DIKEL IKE EXTENSIONS AT BOTH ENDS. LARAMIDE UPLIFT AND FOLDING (ONE OF SERIE S OF SE-PLUNGING EN ECHELON FOLDS ON MARGIN OF UPLIFT) ACCOMPANIED BY REACTIVATION OF NW-TRENDING PRECAMBRIAN (?) STRUCTURES NOW SEEN AS FLE CHER HILL FAULT, WHICH TRUNCATES SW LIMB OF MASONVILLE ANTICLINE AND S W SIDE OF MASONVILLE STOCK. JOINTS AND FRACTURES RELATED TO STOCK EMPL ACEMENT SHOW HYDROTHERMAL MINERALIZATION SEQUENCE OF EPIDOTE, SERICITE , QUARTZ, MONTMORILLONITE, FE OXIDES, PYRITE, CHALCOPYRITE, AU, AG. WO LFE DID NOT CONSIDER MINERALIZATION TO BE EXTENSIVE BECAUSE FRACTURE C ONTROL APPEARED TO BE DUE TO STRUCTURAL FORCES OF VERY LOCAL DEVELOPME NT. BELSER NOTED SCHEELITE TO OCCUR AS FLAKES ON WALLS OF VEINS. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-APR-83 | Schwochow, Stephen D. | Colorado Geological Survey | |
| Editor | 16-NOV-11 | Wilson, Anna B | U.S. Geological Survey | Changed record type from site to district. |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
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