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Quartz Reef Mining
Quartz reef mining is a type of gold mining in "reefs" (veins) of quartz. Quartz is one of the most common minerals in the earth's crust, and most quartz veins do not carry gold, but those that have gold are avidly hunted by prospectors. In the shallow, oxidized zones of quartz reef deposits, the gold occurs in its metallic state, and is easily recovered with simple equipment. Quartz reef mining played an important role in 19th century gold-mining districts such as Bendigo, Victoria, Central Otago in New Zealand, and the California mother lode. Mining Mining the ore usually required mine shafts sunk to mine quartz from the reefs, sometimes deep underground. Horizontal tunnels called drifts were dug out from the shaft at different levels to find the gold-bearing rock. All the ore was hoisted to the surface for processing. Water had to be removed by pumping. Big hoisting engines were installed to hoist lifts and buckets up the shafts. On the surface above the shaft stands a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Mining
Gold mining is the extraction of gold resources by mining. Historically, mining gold from alluvial deposits used manual separation processes, such as gold panning. However, with the expansion of gold mining to ores that are not on the surface, has led to more complex extraction processes such as pit mining and gold cyanidation. In the 20th and 21st centuries, most volume of mining was done by large corporations, however the value of gold has led to millions of small, artisanal miners in many parts of the Global South. Like all mining, human rights and environmental issues are common issues in the gold mining industry. In smaller mines with less regulation, health and safety risks are much higher. History The exact date that humans first began to mine gold is unknown, but some of the oldest known gold artifacts were found in the Varna Necropolis in Bulgaria. The graves of the necropolis were built between 4700 and 4200 BC, indicating that gold mining could be at least 7000 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Wheel
A water wheel is a machine for converting the energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a wheel (usually constructed from wood or metal), with a number of blades or buckets arranged on the outside rim forming the driving car. Water wheels were still in commercial use well into the 20th century but they are no longer in common use. Uses included milling flour in gristmills, grinding wood into pulp for papermaking, hammering wrought iron, machining, ore crushing and pounding fibre for use in the manufacture of cloth. Some water wheels are fed by water from a mill pond, which is formed when a flowing stream is dammed. A channel for the water flowing to or from a water wheel is called a mill race. The race bringing water from the mill pond to the water wheel is a headrace; the one carrying water after it has left the wheel is commonly referred to as a tailrace. Waterwheels were used for various purposes from a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Mining
Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit. The exploitation of these deposits for raw material is based on the economic viability of investing in the equipment, labor, and energy required to extract, refine and transport the materials found at the mine to manufacturers who can use the material. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory. Mining in a wider sense includes extraction of any non-renewable resource such as petroleum, natural gas, or even water. Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Mining
Gold mining is the extraction of gold resources by mining. Historically, mining gold from alluvial deposits used manual separation processes, such as gold panning. However, with the expansion of gold mining to ores that are not on the surface, has led to more complex extraction processes such as pit mining and gold cyanidation. In the 20th and 21st centuries, most volume of mining was done by large corporations, however the value of gold has led to millions of small, artisanal miners in many parts of the Global South. Like all mining, human rights and environmental issues are common issues in the gold mining industry. In smaller mines with less regulation, health and safety risks are much higher. History The exact date that humans first began to mine gold is unknown, but some of the oldest known gold artifacts were found in the Varna Necropolis in Bulgaria. The graves of the necropolis were built between 4700 and 4200 BC, indicating that gold mining could be at least 7000 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Historical Landmark
A California Historical Landmark (CHL) is a building, structure, site, or place in California that has been determined to have statewide historical landmark significance. Criteria Historical significance is determined by meeting at least one of these criteria: # The first, last, only, or most significant of its type in the state or within a large geographic region ( Northern, Central, or Southern California); # Associated with an individual or group having a profound influence on the history of California; or # An outstanding example of a period, style, architectural movement or construction; or is the best surviving work in a region of a pioneer architect, designer, or master builder. Other designations California Historical Landmarks numbered 770 and higher are automatically listed in the California Register of Historical Resources. A site, building, feature, or event that is of local (city or county) significance may be designated as a California Point of Historical Interes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Hill (Nevada County, California)
Gold Hill in Grass Valley, California, was the site of one of the first discoveries of quartz gold in California. While quartz gold was also found in other areas of Nevada County, California during the same time, it is this find near Wolf Creek that led to quartz-mining frenzy and subsequent creation of the Gold Country quartz-mining industry. The location is honored as a California Historical Landmark. History George Knight (sometimes known as McKnight) was a California Gold Rush miner. In October 1850, he was on a Grass Valley hillside when he came across an outcropping of white quartz rock laced with yellow. He pounded the rock with a cast iron skillet and hammer, then washed out the gold. Searching for more gold in the same spot, he dug down into the outcropping and found a gold vein. His find was announced by another miner, George Crandall (1825–1908), who ran down to Boston Ravine, a small settlement nearby, with the news. Knight named the location Gold Hill and his cl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tonne
The tonne ( or ; symbol: t) is a unit of mass equal to 1000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United States customary units), and the long ton ( British imperial units). It is equivalent to approximately 2204.6 pounds, 1.102 short tons, and 0.984 long tons. The official SI unit is the megagram (symbol: Mg), a less common way to express the same mass. Symbol and abbreviations The BIPM symbol for the tonne is t, adopted at the same time as the unit in 1879.Table 6 . BIPM. Retrieved on 2011-07-10. Its use is also official for the metric ton in the United States, having been adopted by the United States |
Central Deborah Mine
The Central Deborah Gold Mine is a non-active gold mine and tourist attraction in Bendigo, Australia. It was listed on the Victorian Heritage Register on 18 November 1999. The mine was opened in 1939 by the Central Deborah Gold Mining Company during a 1930s revival of the gold industry, extending an existing 108 ft shaft from many years earlier with new machinery. It was one of the last mines to open on the Bendigo goldfields and one of the few to stay open during World War II. It was expanded during 1945–46, with extensions and new machinery. It reached its maximum depth (now recorded as 412m) during the 1940s. It closed in November 1954, having produced 29,865 ounces of gold in its lifetime; the closure of the North Deborah Mine two weeks later marked the last mine in Bendigo to close. It was reopened in 1986 as a tourist attraction for underground tours, with its shaft being widened to allow for larger lifts. It was preserved and restored by a local heritage organisat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victoria, Australia
Victoria is a state in southeastern Australia. It is the second-smallest state with a land area of , the second most populated state (after New South Wales) with a population of over 6.5 million, and the most densely populated state in Australia (28 per km2). Victoria is bordered by New South Wales to the north and South Australia to the west, and is bounded by the Bass Strait to the south (with the exception of a small land border with Tasmania located along Boundary Islet), the Great Australian Bight portion of the Southern Ocean to the southwest, and the Tasman Sea (a marginal sea of the South Pacific Ocean) to the southeast. The state encompasses a range of climates and geographical features from its temperate coastal and central regions to the Victorian Alps in the northeast and the semi-arid north-west. The majority of the Victorian population is concentrated in the central-south area surrounding Port Phillip Bay, and in particular within the metropolitan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bendigo
Bendigo ( ) is a city in Victoria (Australia), Victoria, Australia, located in the Bendigo Valley near the geographical centre of the state and approximately north-west of Melbourne, the state capital. As of 2019, Bendigo had an urban population of 100,991, making it Australia's 19th-largest city, fourth-largest inland city and the fourth-most populous city in Victoria (Australia), Victoria. It is the administrative centre of the City of Greater Bendigo, which encompasses outlying towns spanning an area of approximately 3,000 km2 (1,158 sq mi) and over 111,000 people. Estimated resident population, 30 June 2016. Residents of the city are known as "Bendigonians". The traditional owners of the area are the Djadjawurrung, Dja Dja Wurrung (Djaara) people. The discovery of gold on Bendigo Creek in 1851 transformed the area from a sheep station into one of colonial Australia's largest boomtowns. News of the finds intensified the Victorian gold rush, bringing an influx of migran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victoria Quartz Mine
Victoria most commonly refers to: * Victoria (Australia), a state of the Commonwealth of Australia * Victoria, British Columbia, provincial capital of British Columbia, Canada * Victoria (mythology), Roman goddess of Victory * Victoria, Seychelles, the capital city of the Seychelles * Queen Victoria (1819–1901), Queen of the United Kingdom (1837–1901), Empress of India (1876–1901) Victoria may also refer to: People * Victoria (name), including a list of people with the name * Princess Victoria (other), several princesses named Victoria * Victoria (Gallic Empire) (died 271), 3rd-century figure in the Gallic Empire * Victoria, Lady Welby (1837–1912), English philosopher of language, musician and artist * Victoria of Baden (1862–1930), queen-consort of Sweden as wife of King Gustaf V * Victoria, Crown Princess of Sweden (born 1977) * Victoria, ring name of wrestler Lisa Marie Varon (born 1971) * Victoria (born 1987), professional name of Song Qian, Chinese s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyanide Process
Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction. Cyanidation is also widely used in the extraction of silver, usually after froth flotation. Production of reagents for mineral processing to recover gold represents more than 70% of cyanide consumption globally. Other metals are recovered from the process include copper, zinc, and silver, but gold is the main driver of this technology. Due to the highly poisonous nature of cyanide, the process is controversial and its use is even banned in some parts of the world. Cyanide can be safely used in the gold mining industry. A key feature for safe use of cyanide is to ensure adequate pH control at an alkaline pH level above 10.5. At industrial scale, pH control is mainly achieved using lime, as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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