| Deposit ID | 10087823 |
|---|---|
| MRDS ID | D010179 |
| Record type | Site |
| Current site name | Big Bear No. 2 Mine |
| Alternate or previous names | Big Bear, Little Bear |
| Geographic coordinates: | -105.21169, 39.37583 (WGS84) |
|---|---|
| Elevation | 2210 |
| Relative position | 18.5 MILES S 19 E FROM EVERGREEN |
Political divisions (FIPS codes)
Jefferson(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Platte Canyon(quadrangle 1:24,000 scale)
Bailey(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)
Federal lands
Pike and San Isabel National Forests(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | Colorado | Jefferson |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| 6th Principal | 008S | 070W | 03 | SW OF SE | Colorado |
| Commodity | Importance |
|---|---|
| Feldspar | Primary |
| REE Critical | Primary |
| Materials | Type of material |
|---|---|
| Microcline | Ore |
| Allanite | Gangue |
| Amethyst | Gangue |
| Doverite | Gangue |
| Fluorite | Gangue |
| Gadolinite | Gangue |
| Monazite | Gangue |
| Xenotime | Gangue |
| Result | HAND-PICKED FLUORITIC ORE FROM BIG BEAR AND OTHER PEGMATITES ASSAYED 1 TO 7.5% Y. RAE CONCENTRATES CONTAINED 47.9% Y, 2.8% GD, 2.3% DY, 3.7% ND, 1 TO 2% ER, SM, AND CE |
|---|---|
| Result | 0 TO 1% HO, LA, TB, PR. |
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Pegmatite | ||||
| Rock unit name | Pegmatite;Pikes Peak Granite | ||||
| Rock description | Pegmatite;Pikes Peak Granite | ||||
| |||||
| Host or associated | Associated |
|---|---|
| Rock type | Plutonic Rock > Granitoid > Granite |
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Pegmatite |
| Rock unit name | Pegmatite;Pikes Peak Granite |
| Rock description | Pegmatite;Pikes Peak Granite |
| (1) | -105.21169, 39.37583 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Front Range Uplift, Pikes Peak Batholith |
| Type of structure | Local |
| Structure description | Kennedy Gulch Fault Zone |
| General form | ELLIPSOIDAL |
|---|---|
| Length | 96.01M |
| Width | 50.29M |
| Development status | Past Producer |
|---|---|
| Commodity type | Both |
| Deposit size | Small |
| Significant | No |
| District name | South Platte Pegmatite District |
|---|
| Ownership category | National Forest |
|---|
| Type of workings | Unknown |
|---|---|
| Length | 82.3M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010179 |
PETERSON, W.L., 1964, GEOLOGY OF THE PLATTE CANYON QUADRANGLE, COLORADO: USGS BULL. 1181-C, 23 P., 1 PL.
| Subject category | Comment text |
|---|---|
| Deposit | LARGER ELLIPSOIDAL PEGMATITE CONTAINS RELATIVELY THICK WALL ZONE OF QUARTZ-MICROCLINE-BIOTITE AND MICROCLINE-QUARTZ CORE THAT IS TRANSECTED BY LARGE REPLACEMENT UNIT OF FLUORITE AND YTTROFLUORITE AND OTHER RAE. TWO QUARTZ SUBCORES MAPPED IN EXTENSION OF BODY TO NW. OTHER SMALL QUARTZ CORES ISOLATED IN GRANITE BETWEEN MAIN DEPOSITS. SMALLER PEGMATITE TO SE CONTAINS SIMILAR REPLACEMENT UNIT AND REPLACEMENT(?) AMETHYST. |
| 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.