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19th-century miner pouring water into a rocker box which, when rocked back and forth, will help separate gold dust from the alluvium. Placer mining (/ ˈ p l æ s ər /) [1] is the mining of stream bed deposits for minerals. [2] This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment.
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 ...
Pima County, Arizona The Las Guijas Mountains are a small northwest–southeast trending mountain range in southern Pima County, Arizona . The range is approximately 12 kilometres (7.5 mi) long by 4 km (2.5 mi). [ 2 ]
Las Guijas is a populated place situated in Pima County, Arizona, United States. [2] It has an estimated elevation of 3,451 feet (1,052 m) above sea level. [1] The name, as with the nearby mountains of the same name, comes from 19th century Spanish miners referring to las guijas for "the rubble" as the placer gold they were working occurred in the gravels or conglomerates along the stream ...
Gila City was founded on the south bank of the Gila River, 19 miles east of the confluence of the Gila and Colorado rivers.Also known as Ligurta, [1] the town was established as a result of Arizona's first major gold rush, when Colonel Jacob Snively led a party of prospectors to a placer deposit along the Gila River in and around Monitor Gulch, which emerges from the Gila Mountains to the south.
The last gold mine to operate in Arizona was the Gold Road mine at Oatman, which shut down in 1998. Patriot Gold is exploration drilling at the Moss mine at Oatman. [15] In 2006, all of Arizona's gold production came as a byproduct of copper mining.
The town of Weaverville was established shortly after the discovery of placer gold deposits on nearby Rich Hill in May 1863. The town was named after mountain man Pauline Weaver, who worked as a guide for the group of prospectors who made the discovery. The gold was discovered by a member of the party while chasing a stray donkey. [2]
The town of Congress with the mine in the background, c. 1914 The Congress Mine is a gold mine located at the ghost town of Congress, Arizona, on the southeastern slope of the Date Creek Mountains, approximately 18 miles north-northeast of Wickenburg, Arizona, at an elevation of about 3,000 feet (Lat. 34.216 – Long. -122.841).