| Lat / long: | 39.79638, -105.27114 |
| Primary: | Mica, Beryllium |
| Tertiary: | Quartz, Feldspar |
| Ore: | Beryl, Muscovite, Quartz |
| Orebody form: | TABULAR |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| Host rock: | Idaho Springs Formation---Plagioclase-Quartz-Biotite Gneiss And Plagioclase-Hornblende Gneiss, And Amphibolite;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 | D010194 |
| DEP | 10013736 |
| 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:: 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. OF 1/26/59 (FROM ORIGINAL CRIB RECORD)} |
| Reporter | Schwochow, Stephen D., Spanski, Gregory T. |