| Host rock: | Rawley Andesite;Intrusive Quartz Latite And Rhyolite |
| Host type: | Rhyolite,Quartz Latite,Andesite |
| Associated rock: | Rawley Andesite;Intrusive Quartz Latite And Rhyolite |
| Associated type: | Rhyolite,Quartz Latite,Andesite |
| Structure: | Sawatch Range, San Juan Volcanic Field, Rio Grande Rift, Bonanza Caldera |
| Tectonic: | Central Cordillera (Southern Rocky Mtns.) |
| Alteration processes: | Early Barren Stage Of Alteration By Fumarolic Or Acid-Hot Spring Activity Resulted In Intense Silicification, Wallrock Replacement By Jasper And Alteration Products Hematite, Diaspore, Alunite, Barite, Zunyite, Rutile, And Kaolin Minerals. Later Mineralizing Stage By Alkaline Or Neutral Solutions Deposited Ore And Gangue And Caused Micaceous Alteration (Sericite And Chlorite) And Calcite, Quartz, And Pyrite. |