| Lat / long: | 39.76582, -105.34919 |
| Primary: | Beryllium, REE, Feldspar |
| Ore: | Beryl, Microcline |
| Gangue: | Garnet, Monazite |
| Orebody form: | TABULAR |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| Host rock: | Idaho Springs Formation---Hornblende Gneiss Unit |
| Host type: | Gneiss,Amphibolite |
| Associated rock: | Granitic Pegmatite |
| Associated type: | Pegmatite |
| Structure: | Front Range Uplift, Denver Basin, Junction Ranch Fault System, Unnamed Anticline, Unnamed Overturned Anticline |
| Tectonic: | Central Cordillera (Southern Rocky Mtns) |
| MRDS | D010195 |
| DEP | 10101838 |
| Reference | {Deposit:: SHERIDAN, D.M., AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCL. GEOLOGIC MAP OF RALSTON BUTTES QUAD)}{Deposit:: PARKER, R.L., 1963, NIOBIUM AND TANTALUM IN THE UNITED STATES: USGS MAP MR-36}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28.}{Deposit:: USBM MIN. EXAM. FILE, REPT. 6/1/59 (FROM ORIGINAL CRIB RECORD)}{Production:: ORIGINAL CRIB RECORD (SEE USBM REFERENCE)} |
| Reporter | Schwochow, Stephen D. |