| Lat / long: | 39.7886, -105.34864 |
| Primary: | Beryllium, Mica, Feldspar |
| Ore: | Chrysoberyl, Muscovite |
| Gangue: | Quartz |
| Operation type: | Unknown |
| Production size: | None |
| Development status: | Occurrence |
| Host rock: | Idaho Springs Formation---Interlayered Amphibolite And Biotite-Plagioclase-Quartz Gneiss;Pegmatite |
| Host type: | Gneiss,Amphibolite |
| Associated rock: | Pegmatite |
| Associated type: | Pegmatite |
| Structure: | Front Range Uplift, Denver Basin, Junction Ranch Fault Zone |
| Tectonic: | Central Cordillera (Southern Rocky Mtns) |
| MRDS | D010187 |
| DEP | 10094626 |
| Reference | {Deposit:: SHERIDAN, D,M,M AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCLUDES GEOLOGIC MAP OF RALSTON BUTTES QUAD).}{Deposit:: HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 85.}{Deposit:: USGS COMMODITY FILE: GRP III, REEL 32, 1944; GR III, REEL 40, 1943; GR II, REEL 12, DOC. 2701, 1946 (FROM ORIGINAL CRIB RECORD)} |
| Reporter | Schwochow, Stephen D. |