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Malachite is a copper carbonate hydroxide mineral, with the formula Cu2CO3(OH)2. This opaque, green-banded mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in fractures and deep, underground spaces, where the water table and hydrothermal fluids provide the means for chemical precipitation. Individual crystals are rare, but occur as slender to acicular prisms. Pseudomorphs after more tabular or blocky azurite crystals also occur.
Chuquicamata is the largest open pit copper mine in terms of excavated volume in the world. It is located in the north of Chile, just outside Calama, at 2,850 m (9,350 ft) above sea level. It is 215 km (134 mi) northeast of Antofagasta and 1,240 km (770 mi) north of the capital, Santiago. Flotation and smelting facilities were installed in 1952, and expansion of the refining facilities in 1968 made 500,000 tons annual copper production possible in the late 1970s. Previously part of Anaconda Copper, the mine is now owned and operated by Codelco, a Chilean state enterprise, since the Chilean nationalization of copper in the late 1960s and early 1970s. Its depth of 850 metres (2,790 ft) makes it the second deepest open-pit mine in the world, after Bingham Canyon Mine in Utah, United States.
Copper extraction refers to the methods used to obtain copper from its ores. The conversion of copper ores consists of a series of physical, chemical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors.
Boliden AB is a Swedish multinational metals, mining, and smelting company headquartered in Stockholm. The company produces zinc, copper, lead, nickel, silver, and gold, with operations in Sweden, Finland, Norway, and Ireland.
The Bingham Canyon Mine, more commonly known as Kennecott Copper Mine among locals, is an open-pit mining operation extracting a large porphyry copper deposit southwest of Salt Lake City, Utah, in the Oquirrh Mountains. The mine is the largest human-made excavation, and deepest open-pit mine in the world, which is considered to have produced more copper than any other mine in history – more than 19,000,000 short tons. The mine is owned by Rio Tinto Group, a British-Australian multinational corporation. The copper operations at Bingham Canyon Mine are managed through Kennecott Utah Copper Corporation which operates the mine, a concentrator plant, a smelter, and a refinery. The mine has been in production since 1906, and has resulted in the creation of a pit over 0.75 miles (1,210 m) deep, 2.5 miles (4 km) wide, and covering 1,900 acres. It was designated a National Historic Landmark in 1966 under the name Bingham Canyon Open Pit Copper Mine. The mine experienced a massive landslide in April 2013 and a smaller slide in September 2013.
Mining in Australia has long been a significant primary sector industry and contributor to the Australian economy by providing export income, royalty payments and employment. Historically, mining booms have also encouraged population growth via immigration to Australia, particularly the gold rushes of the 1850s. Many different ores, gems and minerals have been mined in the past and a wide variety are still mined throughout the country.
Silver mining is the extraction of silver by mining. Silver is a precious metal and holds high economic value. Because silver is often found in intimate combination with other metals, its extraction requires the use of complex technologies. In 2008, approximately 25,900 metric tons of silver were consumed worldwide, most of which came from mining. Silver mining has a variety of effects on the environment, humans, and animals.
In Michigan, copper mining became an important industry in the 19th and early 20th centuries. Its rise marked the start of copper mining as a major industry in the United States.
In Arizona, copper mining has been a major industry since the 19th century. In 2007, Arizona was the leading copper-producing state in the country, producing 750 thousand metric tons of copper, valued at $5.54 billion. Arizona's copper production was 60% of the total for the United States. Copper mining also produces gold and silver as byproducts. Byproduct molybdenum from copper mining makes Arizona the nation's second-largest producer of that metal. Although copper mineralization was found by the earliest Spanish explorers of Arizona, the territory was remote, and copper could seldom be profitably mined and shipped. Early Spanish, Mexican, and American prospectors searched for gold and silver, and ignored copper. It was not until the completion of the Southern Pacific Railroad in 1876 that copper became broadly economic to mine and ship to market.
Mining in Afghanistan was controlled by the Ministry of Mines and Petroleum, prior to the August 15th takeover by the Taliban. It is headquartered in Kabul with regional offices in other parts of the country. Afghanistan has over 1,400 mineral fields, containing barite, chromite, coal, copper, gold, iron ore, lead, natural gas, petroleum, precious and semi-precious stones, salt, sulfur, lithium, talc, and zinc, among many other minerals. Gemstones include high-quality emeralds, lapis lazuli, red garnet and ruby. According to a joint study by The Pentagon and the United States Geological Survey, Afghanistan has an estimated US$1 trillion of untapped minerals.
The mineral industry of Peru has played an important role in the nation's history and been integral to the country's economic growth for several decades. The industry has also contributed to environmental degradation and environmental injustice; and is a source of environmental conflicts that shape public debate on good governance and development.
Helvetia is a ghost town in Pima County, Arizona, United States that was settled in 1891 and abandoned in the early 1920s. Helvetia is an ancient name for Switzerland. Today, only the Ray Mine and cemetery are visitable, as the rest of the town has been fenced off due to active mining operations.
Mining in the United States has been active since the beginning of colonial times, but became a major industry in the 19th century with a number of new mineral discoveries causing a series of mining rushes. In 2015, the value of coal, metals, and industrial minerals mined in the United States was US$109.6 billion. 158,000 workers were directly employed by the mining industry.
Tin mining began early in the Bronze Age, as bronze is a copper-tin alloy. Tin is a relatively rare element in the Earth's crust, with approximately 2 ppm, compared to iron with 50,000 ppm.
The Robinson Mine is a porphyry copper deposit located at Ruth, White Pine County, Nevada, in the Egan Range, 4 miles (6.4 km) west of Ely. The mine comprises three large open pits: Liberty, Tripp-Veteran and Ruth. The ore is extracted using conventional surface methods, and is then processed into a copper-gold concentrate, and a molybdenum concentrate in a concentrating plant. Since 2012 the mine has been owned and operated by Polish copper miner KGHM Polska Miedź
During most of Chile's history, from 1500 to the present, mining has been an important economic activity. 16th century mining was oriented towards the exploitation of gold placer deposits using encomienda labour. After a period of decline in the 17th century mining resurged in the 18th and early 19th century this time revolving chiefly around silver. In the 1870s silver mining declined sharply. Chile took over the highly lucrative saltpetre mining districts of Peru and Bolivia in the War of the Pacific (1879–83). In the first half of the 20th century copper mining overshadowed the declining saltpetre mining.
Industry of Croatia plays an important role in the country's economy. It has a longstanding tradition based since the 19th century on agriculture, forestry and mining. Many industrial branches developed at that time, like wood industry, food manufacturing, potash production, shipbuilding, leather and footwear production, textile industry, and others. Today, the industrial sectors in Croatia are food and beverage industry, metal processing and machine industry, including vehicles (20%), coke and refined petroleum production (17%), chemical, pharmaceutical, rubber and plastics industry (11%), wood, furniture and paper manufacturing (9%), electrical equipment, electronics and optics fabrication (9%), textile, clothing and footwear industry (5%) as well as construction and building materials production (5%).
Rude, Croatia is a settlement (naselje) in the Samobor administrative territory of Krumpac County, Croatia. As of 2011 it had a population of 1,131 people.
Mining has been conducted on an industrial scale in present-day Canada since the late 18th century. The industry remains an important aspect of the economy of Canada to this day, particularly in the North, and Canadian-domiciled mining companies have increasingly expanded their operations globally.
References
- ↑ "(Facility) Dugi Rat Dalmatia Smelter". USGS. Retrieved 3 April 2021.
- ↑ Oreščanin, Višnja; Mikelić, Luka; Lovrenčić, Ivanka; Barišić, Delko; Mikulić, Nenad; Lulić, Stipe (2006). "Environmental Contamination Assessment of the Surroundings of the Ex-Ferrochromium Smelter Dugi Rat, Croatia". Journal of Environmental Science and Health, Part A. 41 (11): 2547–2555. doi:10.1080/10934520600927898. PMID 17000545. S2CID 31081570.
- ↑ Steblez, Walter G. "THE MINERAL INDUSTRY OF CROATIA" (PDF). Minerals Information. USGS.
- 1 2 3 4 5 6 Mileusnić, Marta; Maričić, Ana; Hasan, Michaela Hruškova. "Croatian geological heritage related to historical mining and quarrying". European Geologist Journal. 48.
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