Strontia Springs Reservoir and the South Platte River define this mountain corridor where mining and early recreation intersect. The landscape is heavily marked by mineral extraction, particularly concentrated around Raleigh Peak. Notable operations include the Oregon Mine, White Cloud Pegmatite Mine, and various pegmatite and quarry claims such as Luster Number One Quarries and the Susy Belle Pegmatite Mine.
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1893 · Platte Canyon
USGS Topo · 1:125,000
1899 · West Denver
USGS Topo · 1:125,000
1942 · Littleton
USGS Topo · 1:31,680
1945 · Indian Hills
USGS Topo · 1:31,680
1945 · Platte Canyon
USGS Topo · 1:24,000
1945 · Pine
USGS Topo · 1:24,000
1945 · Kassler
USGS Topo · 1:24,000
1948 · Kassler
USGS Topo · 1:24,000
1948 · Pine
USGS Topo · 1:24,000
1948 · Platte Canyon
USGS Topo · 1:24,000