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Sylvanite from
Herald Occurrence, Boulder County Tungsten Mining District, Boulder Co., Colorado, USA

Locality type:Occurrence
Classification
Species:Sylvanite
Formula:(Au,Ag)2Te4
Confirmation
Validity:Believed Valid
References
References:Minerals of Colorado (1997) E.B. Eckel
Data
Mineral Data:Click here to view Sylvanite data
Locality Data:Click here to view Herald Occurrence, Boulder County Tungsten Mining District, Boulder Co., Colorado, USA
Nearest other occurrences of Sylvanite
2.4km (1.5 miles) Alpine Horn, Sugarloaf Mining District, Boulder Co., Colorado, USA
2.6km (1.6 miles) Red Signe Mine, Boulder County Tungsten Mining District, Boulder Co., Colorado, USA
2.6km (1.6 miles) Paymaster-Wheelman Tunnel Occurrence (Black Crystal; Black Prince; Mac Group; Pennsylvania), Boulder County Tungsten Mining District, Boulder Co., Colorado, USA
2.8km (1.8 miles) Empress (Sylvan Ute), Boulder County Tungsten Mining District, Boulder Co., Colorado, USA
3.5km (2.2 miles) Magnolia Vein, Kekionga Mine, Magnolia Mining District, Boulder Co., Colorado, USA
3.6km (2.2 miles) Last Chance (Gray Copper Emerson; Concord; Forest; Franklin Occurrence), Gold Hill Mining District, Boulder Co., Colorado, USA
4.3km (2.7 miles) Grand Republic Occurrence, Gold Hill Mining District, Boulder Co., Colorado, USA
4.3km (2.7 miles) Logan & Sunbeam Occurrence, Gold Hill Mining District, Boulder Co., Colorado, USA
4.3km (2.7 miles) Mountain Lion Mine - Keystone vein, Magnolia Mining District, Boulder Co., Colorado, USA
4.6km (2.9 miles) Keystone Mine, Magnolia Mining District, Boulder Co., Colorado, USA
 
Mineral and/or Locality  
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