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The more advanced techniques of ground sluicing , hydraulic mining and dredging may be used.
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Typically the heyday of a placer gold rush would last only a few years. The free gold supply in stream beds would become depleted somewhat quickly, and the initial phase would be followed by prospecting for veins of lode gold that were the original source of the placer gold.
Hard rock mining, like placer mining, may evolve from low capital investment and simple technology to progressively higher capital and technology. The surface outcrop of a gold-bearing vein may be oxidized, so that the gold occurs as native gold, and the ore needs only to be crushed and washed free milling ore. The first miners may at first build a simple arrastra to crush their ore; later, they may build stamp mills to crush ore more quickly. As the miners dig down, they may find that the deeper part of vein contains gold locked in sulfide or telluride minerals , which will require smelting.
If the ore is still sufficiently rich, it may be worth shipping to a distant smelter direct shipping ore. Lower-grade ore may require on-site treatment to either recover the gold or to produce a concentrate sufficiently rich for transport to the smelter. As the district turns to lower-grade ore, the mining may change from underground mining to large open-pit mining. Many silver rushes followed upon gold rushes. As transportation and infrastructure improve, the focus may change progressively from gold to silver to base metals. In this way, Leadville, Colorado started as a placer gold discovery, achieved fame as a silver-mining district, then relied on lead and zinc in its later days.
Various gold rushes occurred in Australia over the second half of the 19th century. The most significant of these, although not the only ones, were the New South Wales gold rush and Victorian gold rush in , [3] and the Western Australian gold rushes of the s. They were highly significant to their respective colonies' political and economic development as they brought a large number of immigrants, and promoted massive government spending on infrastructure to support the new arrivals who came looking for gold. While some found their fortune, those who did not often remained in the colonies and took advantage of extremely liberal land laws to take up farming.
It was followed by the California Gold Rush of —55 in the Sierra Nevada , which captured the popular imagination. The California gold rush led directly to the settlement of California by Americans and the rapid entry of that state into the union in The gold rush in stimulated worldwide interest in prospecting for gold, and led to new rushes in Australia, South Africa, Wales and Scotland.
Successive gold rushes occurred in western North America: Resurrection Creek , near Hope, Alaska was the site of Alaska's first gold rush in the mid—s. Robert William Service depicted with talent in his poetries the dramatic event of the Gold Rush, especially in the book The Trail of ' In South Africa, the Witwatersrand Gold Rush in the Transvaal was important to that country's history, leading to the founding of Johannesburg and tensions between the Boers and British settlers. At the time of the South African rush, gold production benefited from the newly discovered techniques by Scottish chemists, the MacArthur-Forrest process , of using potassium cyanide to extract gold from low-grade ore.
Between and Tierra del Fuego experienced a gold rush attracting a large number of Chileans, Argentines and Europeans to the archipelago. The gold rush begun in following discovery of gold during the rescue of the French steamship Arctique near Cape Virgenes. Approximately million people are directly or indirectly dependent on small-scale mining.
For example, there are , to 1. From Wikipedia, the free encyclopedia.
For other uses, see Gold Rush disambiguation. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. February Learn how and when to remove this template message. Gold mining in the United States. Brazilian Gold Rush and Tierra del Fuego gold rush. Australian Economic History Review. Events That Shaped Australia. Tar Heel Junior Historian 45, no. Prospecting and Mining Journal. Retrieved 28 November Gold Inflation this time". FX Micheloud Monetary History. Archived from the original on Editorial Francisco de Aguirre S.
University of Washington Press. Retrieved 19 December History of gold exploration and mining in the CIS". The early s were marked by the decision of the Communist Party Politburo to reinstate the institution of prospectors who had been banned as antisocialist elements in the second half of the s. Sweet, kind, loyal, affectionate, loving, compassionate, faithful. Seek my best friend and last-first kiss.
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