Bison Canyon and the surrounding high-elevation basins of Jefferson County are defined by a long history of resource extraction and mountain passage. The terrain is marked by numerous historic mining claims, including the Eureka Mine, Shiels and Ironsides Mine, and Alport Mine, concentrated along the slopes of Mount Pisgah and Sullivan Mountain. These sites represent the enduring legacy of Montana's mining industry within the Continental Divide region.
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1889 · Helena
USGS Topo · 1:250,000
1893 · Helena
USGS Topo · 1:250,000
1899 · Boulder
USGS Topo · 1:125,000
1899 · Helena
USGS Topo · 1:250,000
1903 · Helena
USGS Topo · 1:250,000
1947 · Butte
USGS Topo · 1:250,000
1950 · Jefferson City
USGS Topo · 1:62,500
1954 · Elk Park
USGS Topo · 1:62,500
1954 · Basin
USGS Topo · 1:62,500
1954 · Boulder
USGS Topo · 1:62,500