| Deposit ID | 10013504 |
|---|---|
| MRDS ID | D009847 |
| Record type | District |
| Current site name | Idledale District |
| Geographic coordinates: | -105.24836, 39.66527 (WGS84) |
|---|---|
| Elevation | 2048 |
| Relative position | MILES N W FROM MORRISON |
Political divisions (FIPS codes)
Jefferson(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Morrison(quadrangle 1:24,000 scale)
Denver West(quadrangle 1:100,000 scale)
Denver(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper South Platte(hydrologic unit)
South Platte(hydrologic accounting unit)
South Platte(hydrologic subregion)
Missouri(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Colorado | Jefferson |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| 6th Principal | 004S | 070W | 29,32 | Colorado |
| Commodity | Importance |
|---|---|
| Uranium | Primary |
| Copper | Tertiary |
| Lead | Tertiary |
| Zinc Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Coffinite | Ore |
| Galena | Ore |
| Pitchblende | Ore |
| Pyrite | Ore |
| Sphalerite | Ore |
| Ankerite | Gangue |
| Calcite | Gangue |
| Chlorite | Gangue |
| Fluorite | Gangue |
| Quartz | Gangue |
| Result | WEIGHTED AVERAGE ORE GRADES RANGED FROM 0.22 TO 0.44% U308, WITH OVERALL AVERAGE 0.25 TO 0.28% U308 |
|---|
| Host or associated | Host | ||||
|---|---|---|---|---|---|
| Rock type | Metamorphic Rock > Gneiss | ||||
| Rock unit name | Idaho Springs Formation | ||||
| Rock description | Idaho Springs Formation | ||||
| |||||
| (1) | -105.24836, 39.66527 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Front Range Uplift, Denver Basin |
| Type of structure | Local |
| Structure description | Bear Creek Shear Zone, Junction Ranch Fault, Cherry Gulch Fault |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1955 |
| Year of first production | 1955 |
| Year of last production | 1968 |
| District name | Idledale District |
|---|
| Ownership category | Private |
|---|
| Year | 1955 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^0.30% U308 | ||||||||||||||
| |||||||||||||||
| Year | 1956 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^0.30% U308 | ||||||||||||||
| |||||||||||||||
| Year | 1958 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^0.22% U308 | ||||||||||||||
| |||||||||||||||
| Year | 1960 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1955-1960 | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Cp_Grade: ^0.28% U308 | ||||||||||||||
| |||||||||||||||
| Type of workings | Unknown |
|---|---|
| Length | 709.57M |
| Overall depth | 117.65M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D009847 |
SCOTT, G.R., 1972, GEOLOGIC MAP OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-790-A
GABLE, D.J., 1968, GEOLOGY OF THE CRYSTALLINE ROCKS IN THE WESTERN PART OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS BULL. 1251-E
SIMS, P.K., AND SHERIDAN, D.M., 1964, GEOLOGY OF URANIUM DEPOSITS INTHE FRONT RANGE, COLORADO: USGS BULL, 1159, P. 94-100
SIMS, P.K., AND SHERIDAN, D.M., 1964, P. 96; NELSON-MOORE, J.L., AND OTHERS, 1978, P. 192, 194, 196
| Subject category | Comment text |
|---|---|
| Deposit | COUNTRY ROCK CONSISTS OF VARIOUS GNEISSES, MIGMATITES, AND LENSES OF AMPHIBOLITE AND OTHER ROCKS, WITH FOLIATION TRENDING NW, DIPPING STEEPLY SW. NNW-TRENDING JUNCTION RANCH FAULT INTERSECTS WNW-TRENDING BEAR CREEK SHEAR ZONE AT IDLEDALE. MINERALIZED VEINS IN EACH MAJOR STRUCTURE ARE COMPOUND, BRANCHING, OR ANASTAMOSING FRACTURES SUBPARALLEL TO TREND OF HOST STRUCTURE. SHARPLY DEFINED FISSURE WALLS ENCLOSE QUARTZ-CEMENTED BRECCIA IN CARBONATE MATRIX. PITCHBLENDE COATS FRACTURES, PYRITE GF AMPHIBOLITE AND OTHER ROCKS, WITH FOLIATION TRENDING NW, DIPPING STEEPLY SW, NEW-TRENDING JUNCTION RANCH FAULT INTERSECTS WNW-TRENDING BEAR CREEK SHEAR ZONE AT IDLEDALE, MINERALIZED VEINS IN EACH MAJOR STRUCTURE ARE COMPOUND, BRANCHING, OR ANASTAMOSING FRACTURES SUBPARALLEL TO TREND OF HOST STRUCTURE. SHARPLY DEFINED FISSURE WALLS ENCLOSE QUARTZ-CEMENTED BRECCIA IN CARBONATE MATRIX. PITCHBLENDE COATS FRACTURES, PYRITE GRAINS, AND ALTERED BRECCIA FRAGMENTS. EARLY PERIOD OF BRECCIATION CONSISTS OF |
| Deposit | VARIOUSLY SIZED ANGULAR FRAGMENTS OF COUNTRY ROCK IN VUGGY, FINE-GRAINED QUARTZ MATRIX. SECOND BRECCIATION PRODUCED SMALL FRAGMENTS OF RELATIVELY UNIFORM SIZE. TWO-STAGE MINERALIZATION DETERMINED AT WRI |
| Deposit | INDIVIDUAL RECORDS PREPARED FOR FOLLOWING MINES AND PROPERTIES: GRAPEVINE MINE, QUATMAN LEASE, WRIGHT LEASE (FOOTHILLS MINE). ; INFO.SRC : 1 PUB LIT |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JAN-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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