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79-559: The city has been a major center for coal mining throughout much of its modern history, and experienced major growth during the Soviet Union as its coal industry developed. Coal mining remains a significant part of the city's economy. The name Karaganda is derived from " caragana " bushes ( Caragana arborescens , Caragana frutex ), which are abundant in the area. Modern-day Karaganda dates back to 1833, when local shepherd Appak Baizhanov  [ ru ] allegedly found coal on

158-415: A " pit head ". In Australia , "colliery" generally refers to an underground coal mine. Coal mining has had many developments in recent years, from the early days of men tunneling, digging, and manually extracting the coal on carts to large open-cut and longwall mines. Mining at this scale requires the use of draglines , trucks, conveyors , hydraulic jacks , and shearers. The coal mining industry has

237-697: A 70% increase over the 20 years since 1999. In 2018, the world production of brown coal (lignite) was 803.2 Mt, with Germany the world's largest producer at 166.3 Mt. China is most likely the second largest producer and consumer of lignite globally although specific lignite production data is not made available. Coal production has grown fastest in Asia, while Europe has declined. Since 2011, world coal production has been stable, with decreases in Europe and US offset by increases from China, Indonesia and Australia. The top coal mining nations are: Energy production from coal mining

316-467: A coal seam occurring near the top of a ridge or hill, the entire top is removed in a series of parallel cuts. Overburden is deposited in nearby valleys and hollows. This method usually leaves the ridge and hilltops as flattened plateaus. The process is highly controversial for the drastic changes in topography, the practice of creating head-of-hollow-fills , or filling in valleys with mining debris, and for covering streams and disrupting ecosystems. Spoil

395-471: A current of 2,500 amps measured by spark gaps in a 570 km (350 mi) stretch of overhead telephone line to Zharyq, blowing all the protective fuses . The late-time MHD -EMP was of low enough frequency to enable it to penetrate 90 cm (35 in) into the ground, overloading a shallow buried lead and steel tape-protected 1,000 km (620 mi) long power cable between Aqmola (now called Astana) and Almaty . It fired circuit breakers and set

474-405: A fourth of the world's energy. Coal extraction methods vary depending on whether the mine is an underground mine or a surface (also called an open cast) mine. Additionally, coal seam thickness and geology are factors in the selection of a mining method. The most economical method of coal extraction for surface mines is the electric shovel or drag line. The most economical form of underground mining

553-403: A greater proportion of the coal deposit than underground methods, as more of the coal seams in the strata may be exploited. This equipment can include the following: Draglines which operate by removing the overburden, power shovels, large trucks in which transport overburden and coal, bucket wheel excavators, and conveyors. In this mining method, explosives are first used in order to break through

632-440: A land use condition is not equal to the original use. Existing land uses (such as livestock grazing, crop and timber production) are temporarily eliminated in mining areas. High-value, intensive-land-use areas like urban and transportation systems are not usually affected by mining operations. If mineral values are sufficient, these improvements may be removed to an adjacent area. Strip mining eliminates existing vegetation, destroys

711-440: A large dining-room table, but with hydraulic jacks for legs. After the large pillars of coal have been mined away, the mobile roof support's legs shorten and it is withdrawn to a safe area. The mine roof typically collapses once the mobile roof supports leave an area. There are six principal methods of underground mining: Coal is mined commercially in over 50 countries. 7,921 million metric tons (Mt) of coal were produced in 2019,

790-559: A long history of significant negative environmental impacts on local ecosystems, health impacts on local communities and workers, and contributes heavily to the global environmental crises, such as poor air quality and climate change . For these reasons, coal has been one of the first fossil fuels to be phased out of various parts of the global energy economy . The major coal producing countries, though, such as China , Indonesia, India and Australia , have not reached peak production, with production increases replacing falls in Europe and

869-447: A method that currently accounts for about 60 percent of world coal production. In deep mining, the room and pillar or bord and pillar method progresses along the seam, while pillars and timber are left standing to support the mine roof. Once room and pillar mines have been developed to a stopping point limited by geology, ventilation, or economics, a supplementary version of room and pillar mining, termed second mining or retreat mining ,

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948-410: A new coal mine. Labor camp A labor camp (or labour camp , see spelling differences ) or work camp is a detention facility where inmates are forced to engage in penal labor as a form of punishment. Labor camps have many common aspects with slavery and with prisons (especially prison farms ). Conditions at labor camps vary widely depending on the operators. Convention no. 105 of

1027-612: A population of about 100,000, about half of which were prisoners. In the 1940s, up to 70% of the city's inhabitants were ethnic Germans . Most of the ethnic Germans were Soviet Volga Germans who were collectively deported to Siberia and Kazakhstan on Stalin's order when Hitler invaded Soviet-annexed eastern Poland and the Soviet Union proper in 1941. Until the 1950s, many of these deportees were interned in labor camps, often simply because they were of German descent. The population of Karaganda fell by 14% from 1989 to 1999 following

1106-574: A result of occupational exposures is coined occupational hearing loss . To protect miners' hearing, the US Mine Safety and Health Administration 's (MSHA) guidelines for noise place a Permissible Exposure Limit (PEL) for noise at 90 dBA time-weighted over 8 hours. A lower cutoff, 85 dBA, is set for a worker to fall into the MSHA Action Level which dictates that workers be placed into hearing conservation programs. Noise exposures vary depending on

1185-575: Is accomplished by drilling holes into the overburden, filling the holes with explosives, and detonating the explosive. The overburden is then removed, using large earth-moving equipment, such as draglines , shovel and trucks, excavator and trucks, or bucket-wheels and conveyors. This overburden is put into the previously mined (and now empty) strip. When all the overburden is removed, the underlying coal seam will be exposed (a 'block' of coal). This block of coal may be drilled and blasted (if hard) or otherwise loaded onto trucks or conveyors for transport to

1264-645: Is assumed that the Bronze Age couple were 16 or 17 years old when they died. Kukushkin supposes that they were from a 'noble family' thanks to the buried gold and jewelry artifacts, ceramic pots, woman's two bracelets on each arm beads, remains of horses and knives found in the grave. On October 28, 2023, the Kostenko mine, a coal mine in Karaganda run by ArcelorMittal Temirtau, the local unit of ArcelorMittal , caught on fire , and killed at least 32 people. In weeks prior to

1343-427: Is commonly started. Miners remove the coal in the pillars, thereby recovering as much coal from the coal seam as possible. A work area involved in pillar extraction is called a pillar section. Modern pillar sections use remote-controlled equipment, including large hydraulic mobile roof-supports, which can prevent cave-ins until the miners and their equipment have left a work area. The mobile roof supports are similar to

1422-418: Is dedicated to mining activities until it can be reshaped and reclaimed. If mining is allowed, resident human populations must be resettled off the mine site; economic activities, such as agriculture or hunting and gathering food and medicinal plants are interrupted. What becomes of the land surface after mining is determined by the manner in which the mining is conducted. Usually reclamation of disturbed lands to

1501-516: Is highly concentrated in certain jurisdictions, which also concentrates much of the social and economic impacts of the industry to these regions. The industry directly employs over seven million workers worldwide, which, in turn, creates millions of indirect jobs. In several parts of the world, producers have reached peak coal as some economies shift away from fossil fuels to address climate change. A 2020 study found that renewables jobs could feasibly be created in these geographies to replace many of

1580-458: Is located in the range. Karaganda has a Continental climate ( Köppen climate classification Dfb ) with warm summers and very cold winters. Precipitation is moderately low throughout the year, although slightly heavier from May to July. Snow is frequent, though light, in winter. The lowest temperature on record is −42.9 °C (−45.2 °F), recorded in 1938, and the highest temperature is 40.2 °C (104.4 °F), recorded in 2002. Due to

1659-479: Is mostly used to generate electricity, and 75% of annual coal production is exported, mostly to eastern Asia. In 2007, 428 million tonnes of coal was mined in Australia. In 2007, coal provided about 85% of Australia's electricity production. In the fiscal year 2008/09, 487 million tonnes of coal was mined, and 261 million tonnes was exported. In the fiscal year 2013/14, 430.9 million tonnes of coal

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1738-417: Is partially economically recoverable. Coal refuse is distinct from the byproducts of burning coal, such as fly ash . Piles of coal refuse can have significant negative environmental consequences, including the leaching of iron, manganese, and aluminum residues into waterways and acid mine drainage . The runoff can create both surface and groundwater contamination. The piles also create a fire hazard, with

1817-593: Is placed at the head of a narrow, steep-sided valley or hollow. In preparation for filling this area, vegetation and soil are removed and a rock drain constructed down the middle of the area to be filled, where a natural drainage course previously existed. When the fill is completed, this underdrain will form a continuous water runoff system from the upper end of the valley to the lower end of the fill. Typical head-of-hollow fills are graded and terraced to create permanently stable slopes. Most coal seams are too deep underground for opencast mining and require underground mining,

1896-436: Is referred to as 'overburden' and is removed in long strips. The overburden from the first strip is deposited in an area outside the planned mining area and referred to as out-of-pit dumping. Overburden from subsequent strips is deposited in the void left from mining the coal and overburden from the previous strip. This is referred to as in-pit dumping. It is often necessary to fragment the overburden by use of explosives. This

1975-515: Is removed and overburden dumped to the side. Dust, vibration, and diesel exhaust odors are created (affecting sight, sound, and smell). Residents of local communities often find such impacts disturbing or unpleasant. In case of mountaintop removal , tops are removed from mountains or hills to expose thick coal seams underneath. The soil and rock removed is deposited in nearby valleys, hollows and depressions, resulting in blocked (and contaminated) waterways. Removal of soil and rock overburden covering

2054-701: Is still common, with 4,000 new cases of black lung every year in the US (4 percent of workers annually) and 10,000 new cases every year in China (0.2 percent of workers). The use of water sprays in mining equipment reduces the risk to miners' lungs. Build-ups of a hazardous gas are known as damps, possibly from the German word Dampf which means steam or vapor: Noise is also a contributing factor to potential adverse effects on coal miners' health. Exposure to excessive noise can lead to noise-induced hearing loss . Hearing loss developed as

2133-464: Is the long wall, which involves using two spinning drums with carbide bits that runs along sections of the coal seam. Many coals extracted from both surface and underground mines require washing in a coal preparation plant . Technical and economic feasibility are evaluated based on the following: regional geological conditions; overburden characteristics; coal seam continuity, thickness, structure, quality, and depth; strength of materials above and below

2212-435: Is used for both thermal and metallurgical coals . In New South Wales open casting for steam coal and anthracite is practiced. Surface mining accounts for around 80 percent of production in Australia, while in the US it is used for about 67 percent of production. Globally, about 40 percent of coal production involves surface mining. Strip mining exposes coal by removing earth above each coal seam. This earth to be removed

2291-730: The Catholic Cathedral of the Blessed Virgin Mary of Fatima was opened. The city is home to the Miners Palace of Culture  [ ru ; kk ] , a large theater. FC Shakhter Karagandy is a football club based in the city who play at Shakhtyor Stadium . They finished 7th in the Kazakhstan Premier League in 2022. They last won the competition in the 2012 season and also won the Kazakhstan Cup in 2013. One of

2370-482: The Industrial Revolution , and coal provided the main source of primary energy for industry and transportation in industrial areas from the 18th century to the 1950s. Coal remains an important energy source. Coal is also mined today on a large scale by open pit methods wherever the coal strata strike the surface or are relatively shallow. Britain developed the main techniques of underground coal mining from

2449-575: The Nura river and to the west the Sherubainura , its main tributary. In the southern part of the city lies the Fedorov Reservoir , built in 1941 by filling a coal mine pit with the water of river Sokyr that flows along the southern limit. The Bugyly Range (Бұғылы), reaching a height of 1,187 m (3,894 ft), rises about 60 km (37 mi) to the south of the city. The Bugyly Nature Reserve

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2528-473: The locative case (Караганде), the final syllable rhymes with the Russian word for "where" (где), as well as with a Russian obscenity used to answer to an unwanted question "Where?". Thus the exchange: "Где?" — "В Караганде!" ("Where?" — "In Karaganda!"). In 2011 an art-installation was installed in Karaganda, deticated to this phrase. Author Flora Leipman, a British resident who moved to the Soviet Union during

2607-559: The 1930s, wrote about her time in the Karlag Prison near Karaganda, and her subsequent decades where she lived in Karaganda, in her book The Long Journey Home . The labor camp described in One Day in the Life of Ivan Denisovich where the author Aleksandr Solzhenitsyn had served some time was located near Karaganda. Coal mining Coal mining is the process of extracting coal from

2686-467: The Karaganda power plant on fire. Kuznetsov's master plan for the city was intended to accommodate 300,000 inhabitants, which was surpassed by the late 1960s. This prompted planners to devise a new plan with the goal of accommodating 600,000 people. By the 1980s, the city's population surpassed 600,000 people, creating the need for further expansion. In 1983, the Karaganda Circus was constructed, which

2765-787: The U.S., Examples include the Sago Mine disaster of 2006, and the 2007 mine accident in Utah 's Crandall Canyon Mine , where nine miners were killed and six entombed. In the decade 2005–2014, US coal mining fatalities averaged 28 per year. The most fatalities during the 2005–2014 decade were 48 in 2010, the year of the Upper Big Branch Mine disaster in West Virginia, which killed 29 miners. Chronic lung diseases, such as pneumoconiosis (black lung) were once common in miners, leading to reduced life expectancy . In some mining countries black lung

2844-608: The US Department of Labor's Mine Safety and Health Administration (MSHA) show that between 1990 and 2004, the industry cut the rate of injuries by more than half and fatalities by two-thirds. But according to the Bureau of Labor Statistics , even in 2006, mining remained the second most dangerous occupation in America, when measured by fatality rate . These numbers, however, include all mining activities, and oil and gas mining contribute to

2923-613: The United Nations International Labour Organization (ILO), adopted internationally on 27 June 1957, intended to abolish camps of forced labor. In the 20th century, a new category of labor camps developed for the imprisonment of millions of people who were not criminals per se , but political opponents (real or imagined) and various so-called undesirables under communist and fascist regimes. Early-modern states could exploit convicts by combining prison and useful work in manning their galleys . This became

3002-660: The United States and proposed mines under development. The coal mining industry employs almost 2.7 million workers. The History of coal mining goes back thousands of years, with early mines documented in ancient China, the Roman Empire and other early historical economies. It became important in the Industrial Revolution of the 19th and 20th centuries, when it was primarily used to power steam engines, heat buildings and generate electricity. Coal mining continues as an important economic activity today, but has begun to decline due to

3081-615: The biggest accomplishments of the club is a victory against Celtic from Scotland in the Champions League qualifying rounds in 2013. The score was 2–0. Saryarka Karagandy is an ice hockey team which competes in the Kazakhstan Hockey Championship , and used to play in the Russian-based Supreme Hockey League (VHL) On May 28, 2011, a monument to a popular catchphrase "Where-where? In Karaganda!"

3160-628: The city hosts 8 coal mines, and during the times of the Soviet Union , hosted as many as 26. Since local water resources are not sufficient for the needs of a major industrial city, the Irtysh–Karaganda Canal was constructed in the 1960s, to supply the Karaganda metropolitan area with water from the Irtysh River more than 400 kilometres (250 mi) away. The city is the seat of the Roman Catholic Diocese of Karaganda . In 2012,

3239-416: The city was to the south of the initial mines. Initially, Karaganda suffered from an inadequate amount of supplies, and living conditions in the settlement were often poor. In 1930, coal production was below expectations. In February 1931, the area was connected via railroad , bringing in a wealth of supplies and highly-qualified personnel. Later that year, NKVD officials established the Karlag Prison . Upon

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3318-581: The coal mining jobs as part of a just transition ; however, renewable energy was not suitable in some of the geographies with high concentrations of miners, such as in China, which is far and away the leading coal-mining nation. Coal refuse (also described as coal waste, rock, slag, coal tailings, waste material, rock bank, culm, boney, or gob ) is the material left over from coal mining, usually as tailings piles or spoil tips . For every tonne of hard coal generated by mining, 400 kg (880 lb) of waste material remains, which includes some lost coal that

3397-497: The coal preparation (or wash) plant. Once this strip is empty of coal, the process is repeated with a new strip being created next to it. This method is most suitable for areas with flat terrain. Equipment to be used depends on geological conditions. For example, to remove overburden that is loose or unconsolidated, a bucket wheel excavator might be the most productive. The life of some area mines may be more than 50 years. The contour mining method consists of removing overburden from

3476-857: The coal resource may cause burial and loss of topsoil, exposes parent material, and creates large infertile wastelands. Soil disturbance and associated compaction result in conditions conducive to erosion. Soil removal from the area to be surface-mined alters or destroys many natural soil characteristics, and reduces its biodiversity and productivity for agriculture. Soil structure may be disturbed by pulverization or aggregate breakdown. Top 10 hard and brown coal producers in 2012 were (in million metric tons): China 3,621, United States 922, India 629, Australia 432, Indonesia 410, Russia 351, South Africa 261, Germany 196, Poland 144, and Kazakhstan 122. Coal has been mined in every state of Australia, but mainly in Queensland, New South Wales and Victoria. It

3555-429: The developed world. Modern coal mining in the US has an average 23 deaths per year due to mine accidents (2001–2020). However, in lesser developed countries and some developing countries, many miners continue to die annually, either through direct accidents in coal mines or through adverse health consequences from working under poor conditions. China , in particular, has the highest number of coal mining related deaths in

3634-455: The disruptive activities of blasting, ripping, and excavating coal. Stripping of overburden eliminates and destroys archeological and historic features, unless they are removed beforehand. The removal of vegetative cover and activities associated with the construction of haul roads, stockpiling of topsoil, displacement of overburden and hauling of soil and coal increase the quantity of dust around mining operations. Dust degrades air quality in

3713-473: The dissolution of the Soviet Union; it was once Kazakhstan's second-largest city after Almaty. Over 100,000 people have since emigrated to Germany . There is also a concentration of ethnic Poles in the city. Robert F. Kennedy (later US Attorney General and US Senator ), alongside US Supreme Court Justice William O. Douglas , visited "five Soviet Central Asian Republics": Turkmenistan , Uzbekistan , Tadzhikistan , Kirghizia , and Kazakhstan . While on

3792-673: The establishment of the Karlag Prison, authorities began to import labor into the region en masse. During the 1930s, the area experienced rapid growth. In 1931, Karaganda was incorporated as a village, and in 1934, was declared a city. Led by planner Alexander Ivanovich Kuznetsov , masters plans for Karaganda were laid out from 1934 until 1938. During the Stalinist purges , peoples from many different nationalities, including Germans , Karachais , Kalmyks , Chechens , Ingush , Greeks , and Crimean Tatars were sent to Karlag. By 1939, Karaganda had

3871-571: The fatalities occurring in the first half of the 20th century. 3,242 died in 1907, the worst year ever; in 2020 there were five. Open cut hazards are principally mine wall failures and vehicle collisions; underground mining hazards include suffocation, gas poisoning, roof collapse, rock burst , outbursts , and gas explosions. Firedamp explosions can trigger the far more dangerous coal dust explosions, which can engulf an entire mine. Most of these risks are greatly reduced in modern mines, and multiple fatality incidents are now rare in most parts of

3950-514: The fire, the Kazakhstani government announced it was in talks to take over part of ArcelorMittal Temirtau's operations, in part due to its dissatisfaction by ArcelorMittal's failure to invest more in its operations, including equipment upgrades and safety precautions. Karaganda is located in a steppe area of the Kazakh Uplands at an elevation of 546 m (1,791 ft). To the northeast flows

4029-457: The genetic soil profile, displaces or destroys wildlife and habitat, alters current land uses, and to some extent permanently changes the general topography of the area mined. Adverse impacts on geological features of human interest may occur in a coal strip mine. Geomorphic and geophysical features and outstanding scenic resources may be sacrificed by indiscriminate mining. Paleontological, cultural, and other historic values may be endangered due to

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4108-483: The ground or from a mine. Coal is valued for its energy content and since the 1880s has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa , a coal mine and its structures are a colliery , a coal mine is called a "pit", and above-ground mining structures are referred to as

4187-450: The immediate area, has an adverse impact on vegetative life, and constitutes health and safety hazards for mine workers and nearby residents. Surface mining disrupts virtually all aesthetic elements of the landscape. Alteration of land forms often imposes unfamiliar and discontinuous configurations. New linear patterns appear as material is extracted and waste piles are developed. Different colors and textures are exposed as vegetative cover

4266-460: The late 18th century onward, with further progress being driven by 19th-century and early 20th-century progress. However, oil and gas were increasingly used as alternatives from the 1860s onward. By the late 20th century, coal was, for the most part, replaced in domestic as well as industrial and transportation usage by oil , natural gas or electricity produced from oil, gas, nuclear power or renewable energy sources. By 2010, coal produced over

4345-404: The majority of fatalities. Coal mining resulted in 47 fatalities that year. One study, though, has suggested that hazards of modern mining are now more accretive with workers facing long-term health impacts, such as sleep deprivation, that build up over time. Strip mining severely alters the landscape, which reduces the value of the natural environment in the surrounding land. The land surface

4424-461: The method of extraction. For example, a study has found that among surface coal mine operations, dragline equipment produced the loudest sound at a range of 88–112 dBA. Within longwall sections, stageloaders used to transport coal from the mining face and shearers used for extraction represent some of the highest noise exposures. Auxiliary fans (up to 120 dBA), continuous mining machines (up to 109 dBA), and roof bolters (up to 103 dBA) represent some of

4503-465: The mining workforce. in 2015 US coal mines had 65,971 employees, the lowest figure since EIA began collecting data in 1978. However, a 2016 study reported that a relatively minor investment would allow most coal workers to retrain for the solar energy industry. Coal mining has been a very dangerous activity and the list of historical coal mining disasters is long. In the U.S., 104,895 coal miners were killed in mine accidents since 1900, 90 percent of

4582-469: The noisiest equipment within continuous mining sections. Exposures to noise exceeding 90 dBA can lead to adverse effects on workers' hearing. The use of administrative controls and engineering controls can be used to reduce noise exposures. Improvements in mining methods (e.g. longwall mining), hazardous gas monitoring (such as safety-lamps or more modern electronic gas monitors), gas drainage, electrical equipment , and ventilation have reduced many of

4661-585: The open pit methods, due to thickness of the seam 20–25 metres (60–90 feet). Coals occurring below 90 m (300 ft) are usually deep mined. However, there are open pit mining operations working on coal seams up to 300–460 metres (1,000–1,500 feet) below ground level, for instance Tagebau Hambach in Germany. When coal seams are near the surface, it may be economical to extract the coal using open-cut , also referred to as open-cast, open-pit, mountaintop removal or strip, mining methods. Opencast coal mining recovers

4740-421: The operation reaches a predetermined stripping ratio (tons of overburden/tons of coal), it is not profitable to continue. Depending on the equipment available, it may not be technically feasible to exceed a certain height of highwall. At this point, it is possible to produce more coal with the augering method in which spiral drills bore tunnels into a highwall laterally from the bench to extract coal without removing

4819-408: The overburden. Mountaintop coal mining is a surface mining practice involving removal of mountaintops to expose coal seams, and disposing of associated mining overburden in adjacent "valley fills." Valley fills occur in steep terrain where there are limited disposal alternatives. Mountaintop removal mining combines area and contour strip mining methods. In areas with rolling or steep terrain with

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4898-425: The potential to spontaneously ignite. Because most coal refuse harbors toxic components, it is not easily reclaimed by replanting with plants like beach grasses. The use of sophisticated sensing equipment to monitor air quality is common and has replaced the use of small animals such as canaries, often referred to as " miner's canaries ". In the United States, the increase in technology has significantly decreased

4977-415: The prominence of heavy industry in Karaganda, the city experiences a high level of air pollution . Air pollution tracking company IQAir found it to have Kazakhstan's highest level of PM2.5 concentration among cities measured from 2017 to 2022, and the 23rd highest in the world among cities measured. Karaganda is a largely industrial city, and coal mining is a major component of its economy. As of 2023,

5056-473: The region's coal deposits, prompting Soviet authorities to establish the Karaganda Coal Trust, and plan for the creation of coal mines and a mining town in the area. Planners set out to create a dozen coal mines, and drafted blueprints for a city to house an estimated 40,000 workers. Coal mining in the area resumed in 1930, and temporary structures were built for miners and their families. The new area for

5135-399: The risks of rock falls, explosions, and unhealthy air quality. Gases released during the mining process can be recovered to generate electricity and improve worker safety with gas engines . Another innovation in recent years is the use of closed circuit escape respirators , respirators that contain oxygen for situations where mine ventilation is compromised. Statistical analyses performed by

5214-418: The seam for roof and floor conditions; topography, especially altitude and slope; climate; land ownership as it affects the availability of land for mining and access; surface drainage patterns; groundwater conditions; availability of labor and materials; coal purchaser requirements in terms of tonnage, quality, and destination; and capital investment requirements. Surface mining and deep underground mining are

5293-565: The seam in a pattern following the contours along a ridge or around the hillside. This method is most commonly used in areas with rolling to steep terrain. It was once common to deposit the spoil on the downslope side of the bench thus created, but this method of spoil disposal consumed much additional land and created severe landslide and erosion problems. To alleviate these problems, a variety of methods were devised to use freshly cut overburden to refill mined-out areas. These haul-back or lateral movement methods generally consist of an initial cut with

5372-405: The site of the city, prompting a coal mining boom. By the late 19th century, the local mines had attracted workers from nearby villages, Russian merchants, and entrepreneurs from France and England. After this initial boom, the mines were abandoned, but are often still labeled on city maps as the "Old Town", but almost nothing remains on that site. In the late 1920s, Soviet geologists examined

5451-457: The six week trip (e.g., Bukhara , 300 to 1 mosque after Soviet rule), his biographers reported that their delegation was not allowed to visit the city of Karaganda which was one of the sites of the most notorious labor camps within the confines of the Soviet Union . The delegation was diverted to Siberia after four denials of visas. Karaganda suffered the most severe electromagnetic pulse effects ever observed when its electrical power plant

5530-432: The spoil deposited downslope or at some other site and spoil from the second cut refilling the first. A ridge of undisturbed natural material 15 to 20 ft (5 to 6 m) wide is often intentionally left at the outer edge of the mined area. This barrier adds stability to the reclaimed slope by preventing spoil from slumping or sliding downhill. The limitations of contour strip mining are both economic and technical. When

5609-556: The strong contribution coal plays in global warming and environmental issues, which result in decreasing demand and in some geographies, peak coal . Compared to wood fuels , coal yields a higher amount of energy per unit mass, specific energy or massic energy, and can often be obtained in areas where wood is not readily available. Though it was used historically as a domestic fuel, coal is now used mostly in industry, especially in smelting and alloy production, as well as electricity generation . Large-scale coal mining developed during

5688-476: The surface or overburden, of the mining area. The overburden is then removed by draglines or by shovel and truck. Once the coal seam is exposed, it is drilled, fractured and thoroughly mined in strips. The coal is then loaded onto large trucks or conveyors for transport to either the coal preparation plant or directly to where it will be used. Most open cast mines in the United States extract bituminous coal . In Canada, Australia, and South Africa, open cast mining

5767-524: The two basic methods of mining. The choice of mining method depends primarily on depth, density, overburden, and thickness of the coal seam; seams relatively close to the surface, at depths less than approximately 55 m (180 ft), are usually surface mined. Coal that occurs at depths of 55 to 90 m (180 to 300 ft) are usually deep mined, but in some cases surface mining techniques can be used. For example, some western U.S. coal that occur at depths in excess of 60 m (200 ft) are mined by

5846-441: The world, with official statistics claiming that 6,027 deaths occurred in 2004. To compare, 28 deaths were reported in the U.S. in the same year. Coal production in China is twice that in the US, while the number of coal miners is around 50 times that of the US, making deaths in coal mines in China 4 times as common per worker (108 times as common per unit output) as in the US. Mine disasters have still occurred in recent years in

5925-458: Was built from 1935 to 1941 and covers an area of 150 hectares (370 acres). Sary-Arka Airport is 20 kilometers south-east of the city. The city is also served by trains with all of them stopping at Karaganda railway station . Karaganda was often used as the punchline in a popular joke in the former Soviet Union . Karaganda is fairly isolated in a vast area of uninhabited steppe , and is thought by many to be "the middle of nowhere". When used in

6004-677: Was created. On May 31, 2022, on the Day of Remembrance of the Victims of Political Repressions in the Karaganda Ethnopark, a new monument to the victims of the Holodomor was opened. The monument is located near the mosque on the territory of the Ethnopark, created from granite by Zharmukhamed Tlegenuly. The height of the monument on the pedestal is 1.2 m. The Central Park serves as Karaganda's main park. It

6083-477: Was criticized for its high cost. In the early 1990s, Karaganda was briefly considered as a candidate for the capital of the (then) newly independent Republic of Kazakhstan, but its bid was turned down in favour of Astana . In July 2019, remains of a young couple buried face to face dated 4,000 years back were unearthed in Karaganda region in central Kazakhstan by a group of archaeologists led by Igor Kukushkin from Saryarka Archaeological Institute in Karaganda. It

6162-531: Was mined, and 375.1 million tonnes was exported. In 2013/14, coal provided about 69% of Australia's electricity production. In 2013, Australia was the world's fifth-largest coal producer, after China, the United States, India, and Indonesia. However, in terms of proportion of production exported, Australia is the world's second largest coal exporter, as it exports roughly 73% of its coal production. Indonesia exports about 87% of its coal production. A court in Australia has cited climate change in ruling against

6241-459: Was set on fire by currents induced in a 1,000 km (620 mi) long shallow buried power cable by Soviet Test ‘184’ on 22 October 1962. The test was part of the Soviet Project K nuclear tests ( ABM System A proof tests), and consisted of a 300- kiloton high-altitude nuclear explosion at an altitude of 290 km (180 mi) over Zhezkazgan . Prompt gamma ray -produced EMP induced

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