| Locality type: | Mine |
| Classification |
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| Species: | Sillimanite |
| Formula: | Al2(SiO4)O |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Sillimanite data |
| Locality Data: | Click here to view Cotopaxi Mine (Cotopaxi lode; Gumaer Mine; Fannie lode; Fannie Mill), Mine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 34977 |
| Long-form Identifier: | 1:3:34977:8 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Sillimanite |
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| 0.2km (0.2 miles) | ⓘMine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA |
| 14.1km (8.7 miles) | ⓘDevil's Hole Mine, Fremont County, Colorado, USA |
| 14.4km (9.0 miles) | ⓘFive Points Gulch, Fremont County, Colorado, USA |
| 24.9km (15.5 miles) | ⓘCopper Girl (Copper Girl 1906; Patented Claims: Valley View), Copper Gulch Area, Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA |
| 26.6km (16.6 miles) | ⓘGreen Mountain Mine (Copper Boy Mine), Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA |
| 30.9km (19.2 miles) | ⓘEl Plomo Mine, Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA |
| 34.4km (21.4 miles) | ⓘDawson Gold project, Fremont County, Colorado, USA |
| 35.9km (22.3 miles) | ⓘCalumet Mine, Turret Mining District, Chaffee County, Colorado, USA |
| 38.1km (23.7 miles) | ⓘWhopper Mine and Prospect, Micanite Mining District (Currant Creek Mining District), Colorado, USA |
| 38.1km (23.7 miles) | ⓘSedalia Mine (Sedalia Copper Mine), Sedalia Mining District, Chaffee County, Colorado, USA |
| References |
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