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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 in Australia, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Wheel
A water wheel is a machine for converting the kinetic energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a large wheel (usually constructed from wood or metal), with numerous blades or buckets attached to the outer rim forming the drive mechanism. Water wheels were still in commercial use well into the 20th century, although they are no longer in common use today. Water wheels are used for 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. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Mining
Mining is the extraction of valuable geological materials and minerals from the surface of the Earth. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. The ore must be a rock or mineral that contains valuable constituent, can be extracted or mined and sold for profit. 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, and final mine reclamation, reclamation or restoration of the land after the mine is closed. Mining materials are often obtained from ore bodies, lodes, vein (geology), veins, coal mining, seams, qu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Mining
Gold mining is the extraction of gold by mining. Historically, mining gold from Alluvium, alluvial deposits used manual separation processes, such as gold panning. 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 mining, artisanal miners in many parts of the Global South. Like all mining, Mining#Human rights, human rights and Environmental effects of mining, environmental issues are common in the gold mining industry, and can result in environmental conflict. In 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Historical Landmark
A California Historical Landmark (CHL) is a building, structure, site, or place in the U.S. state of 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 California, Northern, Central California, 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 ... [...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 1,000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton in the United States 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 2,204.6 pounds, 1.102 short tons, and 0.984 long tons. The official SI unit is the megagram (Mg), a less common way to express the same amount. 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, commonly abbreviated as Vic, is a state in southeastern Australia. It is the second-smallest state (after Tasmania), with a land area of ; the second-most-populated state (after New South Wales), with a population of over 7 million; and the most densely populated state in Australia (30.6 per km2). Victoria's economy is the second-largest among Australian states and is highly diversified, with service sectors predominating. 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 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 northwest. The majority of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bendigo
Bendigo ( ) is an Australian city in north-central Victoria. The city is located in the Bendigo Valley near the geographical centre of the state and approximately north-west of Melbourne, the state capital. As of 2022, Bendigo has a population of 103,818 making it Australia's 19th-largest city by population. Bendigo is the fourth-largest inland city in Australia and the fourth-most populous city in Victoria. Bendigo is administered by the City of Greater Bendigo, formerly the City of Bendigo. The council area encompasses roughly 3,000 square kilometres. The city is surrounded by smaller towns such as Castlemaine, Heathcote, Kyneton, Maryborough, Elmore, Rochester, Goornong and Axedale. The traditional owners of the area are the 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, brin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victoria Quartz Mine
Victoria most commonly refers to: * Queen Victoria (1819–1901), Queen of the United Kingdom and Empress of India * Victoria (state), a state of Australia * Victoria, British Columbia, Canada, a provincial capital * Victoria, Seychelles, the capital city of the Seychelles * Victoria (mythology), Roman goddess of victory Victoria may also refer to: Animals and plants * ''Victoria'' (moth), a moth genus in the family Geometridae * ''Victoria'' (plant), a waterlily genus in the family Nymphaeaceae * Victoria plum, a plum cultivar * Victoria (goose), the first goose to receive a prosthetic 3D printed beak * Victoria (grape), another name for the German/Italian wine grape Trollinger Arts and entertainment Films * ''Victoria'', a Russian 1917 silent film directed by Olga Preobrazhenskaya, based on the Knut Hamsun novel * ''Victoria'' (1935 film), a German film * ''Victoria'' (1972 film), a Mexican film based on Henry James' 1880 novel ''Washington Square'' * ''Victoria ... [...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 through conversion to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction. Cyanidation is also widely used in silver extraction, usually after froth flotation. Production of reagents for mineral processing to recover gold represents 70% of cyanide consumption globally. While other metals, such as copper, zinc, and silver, are also recovered using cyanide, gold remains the primary driver of this technology. The highly toxic nature of cyanide has led to controversy regarding its use in gold mining, with it being banned in some parts of the world. However, when used with appropriate safety measures, cyanide can be safely employed in gold extraction processes. One critical factor in its safe use is maintaining an alkaline pH level above 10.5, which is typically controlled ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
