Pearl Pass serves as a critical high-altitude corridor in this 2011 survey, linking the watersheds of Middle Brush Creek and Cooper Creek. The landscape is defined by its industrial history, with numerous mining operations situated at extreme elevations. Notable extractions include the Arrowhead Mine near the Cumberland Basin and the Twenty-Percent Creek Mine located along the upper reaches of the Taylor River. These sites, along with the Climax Mine and Italian Mountain Mine, indicate a legacy of mineral prospecting in this demanding environment.
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1888 · Crested Butte
USGS Topo · 1:62,500
1889 · Crested Butte
USGS Topo · 1:62,500
1893 · Crested Butte
USGS Topo · 1:62,500
1893 · Aspen
USGS Topo · 1:62,500
1895 · Aspen
USGS Topo · 1:62,500
1909 · Mount Jackson
USGS Topo · 1:125,000
1911 · Mount Jackson
USGS Topo · 1:125,000
1934 · Taylor Park
USGS Topo · 1:62,500
1937 · Taylor Park
USGS Topo · 1:62,500
1956 · Montrose
USGS Topo · 1:250,000