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Placer County ( / ˈplæsər / PLASS-ərr; Spanish for "sand deposit"), officially the County of Placer, is a county located in the U.S. state of California. As of the 2020 census, the population was 404,739. [4] The county seat is Auburn. [5] Placer County is included in the Greater Sacramento metropolitan area.
Placer (geography) The Placer de los Roques marked as Pracel in a 1762 French map. Placer ( Portuguese: parcel or pracel) is a term used by Portuguese and Spanish navigators and cartographers to refer to a certain kind of submerged bank or reef. Commonly the bottom of such a reef is sandy, but there are some where the bottom is muddy or stoney.
Placer mining ( / ˈplæsər /) [1] is the mining of stream bed ( alluvial) deposits for minerals. [2] This may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunneling equipment. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are ...
Mark Elliot Zuckerberg ( / ˈzʌkərbɜːrɡ /; born May 14, 1984) is an American businessman. He co-founded the social media service Facebook, along with his Harvard roommates in 2004, and its parent company Meta Platforms (formerly Facebook, Inc.), of which he is chairman, chief executive officer and controlling shareholder.
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Great Flood of 1862. The Great Flood of 1862 was the largest flood in the recorded history of California, Oregon, and Nevada, inundating the western United States and portions of British Columbia and Mexico. It was preceded by weeks of continuous rains and snows that began in Oregon in November 1861 and continued into January 1862.
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. Placer materials must be both dense and resistant to weathering processes. To accumulate ...