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  2. Placer deposit - Wikipedia

    en.wikipedia.org/wiki/Placer_deposit

    Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers. [2] Placer materials must be both dense and resistant to weathering processes. To ...

  3. Gold Base - Wikipedia

    en.wikipedia.org/wiki/Gold_Base

    Gold Base is located at the base of California's San Jacinto Mountains.The base covers an area of 520-acre (2.1 km 2) near 19712 Gilman Springs Road, south-east of its intersection with California State Route 79, in unincorporated Riverside County, about 4 miles (6.4 km) north-northwest of San Jacinto and Hemet.

  4. List of countries by gold production - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_gold...

    In 1970, South Africa produced 995 tonnes or 32 million ounces of gold, two-thirds of the world's production of 47.5 million ounces. [2] Production figures are for primary mine production. In the US, for example, for the year 2011, secondary sources (new and old scrap) exceeded primary production. [3]

  5. Placer mining - Wikipedia

    en.wikipedia.org/wiki/Placer_mining

    The gold bearing gravel is accessed by shafts and drives similar to underground mining techniques but is typically processed as if alluvial gold. [ 6 ] [ 7 ] [ 8 ] The heat associated with an igneous lava flow, in some cases, altered the gold bearing gravel so that it needed to be crushed first to extract the gold; an example of this kind of ...

  6. Clearwater River (Oregon) - Wikipedia

    en.wikipedia.org/wiki/Clearwater_River_(Oregon)

    The Clearwater River is a river in Douglas County of the U.S. state of Oregon. [1] It is a roughly 15-mile (24 km) long tributary of the North Umpqua River , located about 50 miles (80 km) east of Roseburg in the Cascade Range .

  7. What’s being built there? Hundreds of new Tri-Cities ... - AOL

    www.aol.com/being-built-hundreds-tri-cities...

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