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The Niwot and Columbia mines were the largest producers of lode gold.
In east part of district, many mines produced gold in tellurides.
Also along Cherry Creek, Dry Creek and Cottonwood Creek in T5S R66W and R67W had many productive placer workings.
The Grand Island- Caribou district had a total production between 1932-59, of 10,006 ounces.
Southwest of Denver in the Holy Cross Mountains, there are many small mines that produced lode gold. Boulder County Colorado Boulder County ranks 9th among Colorado's gold producing counties.
Boulder County has produced more than 1,000,000 ounces of gold. Northwest of Boulder 3-8 miles is the Gold Hill Sugarloaf district.
All bars, and benches along Clear Creek, which is a tributary of the South Platte River, had extensive placer operations which produced 16,800 ounces of gold between 19.
Arapahoe County Colorado Along the South Platte River all gravel bars contain placer gold.