| Deposit ID | 10013764 |
|---|---|
| MRDS ID | D010228 |
| Record type | Site |
| Current site name | Mt. Judge Beryl Pegmatite |
| Related records | 10166958 |
| Geographic coordinates: | -105.45003, 39.66749 (WGS84) |
|---|---|
| Elevation | 2926 |
| Location accuracy | 500(meters) |
| Relative position | 12.7 MILES S 60 W FROM GOLDEN |
Political divisions (FIPS codes)
Clear Creek(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Saddleback Mountain(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 | Clear Creek |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| 6th Principal | 004S | 072W | 28 | S2 OF S2 | Colorado |
| Commodity | Importance |
|---|---|
| Beryllium Critical | Primary |
| Feldspar | Tertiary |
| Materials | Type of material |
|---|---|
| Beryl | Ore |
| Microcline | Ore |
| Biotite | Gangue |
| Plagioclase | Gangue |
| Host or associated | Associated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Pegmatite | ||||||||
| Rock unit name | Pegmatite | ||||||||
| Rock description | Pegmatite | ||||||||
| |||||||||
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Gneiss |
| Rock unit name | Idaho Springs Formation---Hornblende Gneiss, Calc-Silicate Gneiss, And Amphibolite |
| Rock description | Idaho Springs Formation---Hornblende Gneiss, Calc-Silicate Gneiss, And Amphibolite |
| (1) | Biotitic gneiss, schist, and migmatite |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Front Range Uplift, Denver Basin |
| Type of structure | Local |
| Structure description | Kennedy Gulch Fault Zone |
| General form | TABULAR |
|---|---|
| Thickness | 15.24M |
| Length | 45.72M |
| Development status | Past Producer |
|---|---|
| Commodity type | Both |
| Deposit size | Small |
| Significant | No |
| Year of first production | 1942 |
| District name | Clear Creek Pegmatite Province |
|---|
| Ownership category | Federal |
|---|
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010228 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0080191097 |
SHERIDAN, D.M., AND MARSH, S.P., 1976, GEOLOGIC MAP OF THE SQUAW PASS QUADRANGLE, CLEAR CREEK, JEFFERSON, AND GILPIN COUNTIES, COLORADO: USGS MAP GQ-1337
| Subject category | Comment text |
|---|---|
| Deposit | NE-TRENDING SWARM OF PEGMATITES CUTS ACROSS FOLIATION OF HORNBLENDE AND CALC-SILICATE GNEISS. PINK MICROCLINE AND ALBITE WITH QUARTZ IN BORDER ZONE; GRAPHIC PEGMATITE BORDERING CORE; 2-FT CORE OF BLACK QUARTZ AND BERYL. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-FEB-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.