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Geology And Mineralization Of The Great Excelsior Mine, Whatcom County, Washington, Russell J. Franklin
Geology And Mineralization Of The Great Excelsior Mine, Whatcom County, Washington, Russell J. Franklin
WWU Graduate School Collection
The Great Excelsior Mine is located in the North Cascades of northwest Washington, approximately 6 miles (10 km) east of the town of Glacier. The deposit consists of Ag with subordinate Au and is hosted within felsic volcanic breccias, tuffaceous siltstones and graywackes, and felsic tuffs belonging to the Middle Jurassic Wells Creek Volcanics. The deposit is located approximately 1000 feet (305 m) below the contact between the Wells Creek Volcanics and the overlying Nooksack Group metasediments. Both units comprise the lowermost structural-metamorphic unit of the western North Cascades System.
The Wells Creek Volcanics have been informally subdivided into four …