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  2. Gold mining in Colorado - Wikipedia

    en.wikipedia.org/wiki/Gold_mining_in_Colorado

    The mining town of Montgomery in Hoosier Pass had another small placer gold operation in 1911. [10] Two notable placer mines in the Alma mining district are Snowstorm, home of the famous Snowstorm Dredge, and Cincinnati. [10] In 1882, the Alma Placer Mining Company owned roughly 640 acres of placer mines. [11]

  3. Placer claim - Wikipedia

    en.wikipedia.org/wiki/Placer_claim

    Gold mining is one of the most common uses for the staking of mining claims. In Alaska, state mining claims may be up to 160 acres (0.65 km 2), and there is no distinction between lode or placer claims. The boundaries of the claim must follow the 4 cardinal directions, with an exception being adjustments for existing valid claims.

  4. Placer mining - Wikipedia

    en.wikipedia.org/wiki/Placer_mining

    In North America, placer mining was famous in the context of several gold rushes, particularly the California Gold Rush and the Colorado Gold Rush, the Fraser Canyon Gold Rush and the Klondike Gold Rush. Placer mining continues in many areas of the world as a source of diamonds, industrial minerals and metals, gems (in Myanmar and Sri Lanka ...

  5. Leadville mining district - Wikipedia

    en.wikipedia.org/wiki/Leadville_mining_district

    Oro City, an early Colorado gold placer mining town located about a mile east of Leadville in California Gulch, was the location to one of the richest placer gold strikes in Colorado, with estimated gold production of 120,000–150,000 ozt (8,200–10,300 lb; 3,700–4,700 kg), worth $2.5 to $3 million at the then-price [clarification needed ...

  6. Gold mining in the United States - Wikipedia

    en.wikipedia.org/wiki/Gold_mining_in_the_United...

    Placer gold deposits were found at San Ysidro in San Diego County in 1828, San Francisquito Canyon and Placerita Canyon in Los Angeles County in 1835 and 1842, respectively Gold miners excavate a gold-bearing bluff with jets of water at a placer mine in Dutch Flat, California sometime between 1857 and 1870.

  7. Tour guide identified as victim who died in Colorado gold ...

    www.aol.com/tour-guide-identified-victim-died...

    Colorado authorities have identified the person that died in a former gold mine that is now a tourist attraction.. Patrick Weier, a Mollie Kathleen Gold Mine tour guide, died after being trapped ...

  8. Timeline of mining in Colorado - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_mining_in_Colorado

    The only working underground mine in Colorado in 2008 was the Cash mine, built in 1872, at Gold Hill in Boulder County. Each ton of ore yields about .75 ounce of gold at the mine, which daily extracts about 50 tons of ore. [4] 2004 nahcolite: Piceance Basin: American Soda pilot project that mined via fracturing ended after 3.75 years. [5] 2004 coal

  9. Colorado investigators blame 'operator error' in deadly 2024 ...

    www.aol.com/news/colorado-investigators-blame...

    The Mollie Kathleen Gold Mine opened in the 1800s and closed in 1961, but still conducts tours, according to the mine's website. It is located near the town of Cripple Creek, about 45 miles ...