| Deposit ID | 10013733 |
|---|---|
| MRDS ID | D010191 |
| Record type | Site |
| Current site name | Cressmans Gulch Prospect |
| Related records | 10134865, 10142804 |
| Geographic coordinates: | -105.25614, 39.7861 (WGS84) |
|---|---|
| Elevation | 2012 |
| Relative position | 2.4 MILES N 37 W FROM GOLDEN |
Political divisions (FIPS codes)
Jefferson(county)
Colorado(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Ralston Buttes(quadrangle 1:24,000 scale)
Denver West(quadrangle 1:100,000 scale)
Denver(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Clear(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 | 003S | 070W | 17 | SW OF SW | Colorado |
| Commodity | Importance |
|---|---|
| Feldspar | Primary |
| Beryllium Critical | Primary |
| Niobium (Columbium) Critical | Secondary |
| Tantalum Critical | Secondary |
| Mica | Tertiary |
| Materials | Type of material |
|---|---|
| Beryl | Ore |
| Microcline | Ore |
| Muscovite | Ore |
| Albite | Gangue |
| Apatite | Gangue |
| Biotite | Gangue |
| Manganotantalite | Gangue |
| Quartz | Gangue |
| Tourmaline | Gangue |
| Host or associated | Associated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Pegmatite | ||||||||
| Rock unit name | Granitic Pegmatite | ||||||||
| Rock description | Granitic Pegmatite | ||||||||
| |||||||||
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Gneiss |
| Rock unit name | Idaho Springs Formation-Hornblende Gneiss Unit |
| Rock description | Idaho Springs Formation-Hornblende Gneiss Unit |
| (1) | -105.25614, 39.7861 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Front Range Uplift, Denver Basin |
| Type of structure | Local |
| Structure description | Hurricane Hill Fault System |
| General form | TABULAR |
|---|---|
| Thickness | 10.67M |
| Length | 96.01M |
| Development status | Past Producer |
|---|---|
| Commodity type | Both |
| Deposit size | Small |
| Significant | No |
| District name | Clear Creek Pegmatite Province |
|---|
| Ownership category | Private |
|---|
| Type | Owner |
|---|---|
| Owner | Lyman C. And Audrey E. Ladwig |
| Home office | Arvada, Co. |
| First year | 1944 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | D010191 | |
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0080590061 |
MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 27.
USGS COMMODITY FILE, GR III, REEL 31, DOCK. 9937, 1945; GR III, REEL 32, DOCK. 10049, 1943; GR III, REEL 40, DOCK. 12742, 1944 (FROM ORIGINAL CRIB RECORD)
ORIGINAL CRIB RECORD (SEE USGS REFERENCE)
| Subject category | Comment text |
|---|---|
| Deposit | PRINCIPAL AND SEVERAL SUBSIDIARY PEGMATITES CUT ACROSS COUNTRY ROCK SCHISTOSITY (N 85 W, 85 TO 90 SW). MAIN ECONOMIC PEGMATITE STRIKES DUE EAST AND DIPS 80 TO 90 S. PEGMATITE CONTAINS 1) WALL ZONE OF QUARTZ-MICROCLINE-ALBITE PEGMATITE WITH TOURMALINE, 2) INTERMEDIATE ZONE OF QUARTZ-ALBITE PEGMATITE WITH BERYL AND APATITE, AND 3) CORE OF QUARTZ-MICROCLINE PEGMATITE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JAN-1983 | Schwochow, Stephen D. | Colorado Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
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