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37-465: The Powder River Basin is a geologic structural basin in southeast Montana and northeast Wyoming , about 120 miles (190 km) east to west and 200 miles (320 km) north to south, known for its extensive coal reserves . The former hunting grounds of the Oglala Lakota , the area is very sparsely populated and is known for its rolling grasslands and semiarid climate. The basin is both

74-587: A concern for surrounding ranchers who organized to resist new mines in the 1970s. Southern Powder River Basin Northern Powder River Basin In June 2019, Peabody Energy and Arch Coal announced a joint venture for their combined Powder River Basin assets. The Powder River Basin also contains major deposits of petroleum , including the giant Salt Creek Oil Field . The oil and gas are produced from rocks ranging from Pennsylvanian to Tertiary , but most comes from sandstones in

111-601: A concern. A coal-fired plant designed to burn Appalachian coal must be modified to remove SO 2 at a cost estimated in 1999 to be around $ 322 per ton of SO 2 . If it switched to burning PRB coal, the cost dropped to $ 113 per ton of SO 2 removed. Removal is accomplished by installing scrubbers. The Powder River Basin is the largest coal mining region in the US, but most of the coal is buried too deeply to be economically accessible. The Powder River Basin coal beds are shaped like elongated bowls and as mines expand from east to west in

148-557: A major threat due to water quality regulations. The Cheyenne River is still higher in dissolved mineral content than any other South Dakota major river. The Cheyenne watershed is part of the Missouri River watershed and spans the Mountain West and Great Plains states of northeastern Wyoming, southwestern and south central South Dakota, as well as small areas of northwestern Nebraska, and southeastern Montana. As of 2001,

185-548: A section of Phanerozoic rocks up to 17,000 feet (5,200 m) thick, from Cambrian to Holocene . The thickest section of the Powder River Basin is composed of Cretaceous rocks, an overall regressive sequence of mostly marine shales and sandstones deposited in the Western Interior Seaway . The coal beds of the region began to form about 60 million years ago when the land began rising from

222-640: A series of pressurization plants, as well as power lines to provide electricity to operate the system. In addition, thousands of miles of new access roads have been constructed. Extracting the gas requires that water be pumped to the surface to release gas trapped in the coal seam. While some of the water is successfully utilized in agriculture production such as livestock water and crop irrigation, some waters are naturally high in salinity and sodium adsorption ratio . There has been controversy on how to best manage these saline waters. In 2007, Powder River Basin coalbed field produced 442 billion cubic feet of gas, making

259-517: A shallow sea. The rise of the Black Hills uplift on the east and the Hartville uplift on the southeast side of the basin created the present outline of the Powder River Basin. When the coal beds were forming, the climate in the area was subtropical, averaging about 120 inches (3 m) of rainfall a year. For some 25 million years, the basin floor was covered with lakes and swamps. Because of

296-483: A small fraction of the coal would be economically accessible at the price then of $ 10.47/ton. In August 2008, the USGS issued an updated assessment of coal in the Powder River Basin. After considering stripping ratios and production costs, the USGS concluded that at that time, only 6% of the original resource, or 10.1 billion short tons of coal, was economically recoverable. At a price of $ 60/ton, however, roughly half (48%) of

333-464: A topographic drainage and geologic structural basin , drained by the Powder River , Cheyenne River , Tongue River , Bighorn River , Little Missouri River , Platte River , and their tributaries. The major cities in the area include Gillette and Sheridan, Wyoming and Miles City, Montana . In 2007, the region produced 436 million short tons (396 million tonnes) of coal, more than twice

370-582: Is joined by Rapid Creek , passes Wasta and is joined by the Belle Fourche River in eastern Meade County , after which it flows ENE along the southern boundary of the Cheyenne River Indian Reservation . Near the town of Cherry Creek , it is joined by Cherry Creek and flows into Missouri at Lake Oahe , approximately 32 mi (50 km) NNW of Pierre, South Dakota , with the lower 35 mi (56 km) of

407-729: The Arkansas Electric Cooperative Corporation . As a result, the 280-mile (450 km) expansion of the Dakota, Minnesota and Eastern Railroad line was approved by the Surface Transportation Board . In 2006 UP and BNSF announced a $ 100 million investment to provide three track capacity for the entire length of the Joint Line plus a fourth track added over the steepest sections, including Logan Hill. These improvements will enable

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444-494: The Pacific Northwest to export coal from the Powder River Basin to Asian markets. As of February 2016, some coal terminal proposals had been withdrawn, leaving two with pending applications. The withdrawals were ascribed to loss of demand and consequent lower coal prices. Originally a single track Burlington Northern Railway line built in stages from 1972 to 1979, the rail line ran south from Donkey Creek Junction in

481-796: The Thunder Basin National Grassland in Converse County . It flows east into South Dakota, passes Edgemont , and skirts the southern end of the Black Hills , passing through Angostura Reservoir . On the east side of the Black Hills, it flows northeast, past Oral , the Buffalo Gap National Grassland , and along the northwestern boundary of the Pine Ridge Indian Reservation and Badlands National Park . It

518-614: The United States ' electricity supplies. The Powder River Basin mines supply approximately 40% of the coal that fuels those stations (mainly east of the Rocky Mountains) for generating electricity . The mines work in areas where the stripping ratio is between 1:1 (i.e. one ton of rock for one ton of coal) and 3:1. As the mines expand the stripping ratio will increase. As more rock must be moved (using large electrically powered draglines and diesel and electric mining trucks)

555-656: The Cheyenne watershed was primarily grassland (62.8%), followed by shrubland (16.3%) and forest cover (11.9%). The primary population centers include Rapid City, South Dakota and Gillette, Wyoming . With a population of nearly 4.5 million in these states, water use was an average of 5,254 million US gallons per day (19,890 million litres per day) in 2010. This amounts to approximately 1,170 US gallons (4,400 L) per person per day. A total of 1,855 thousand acre-feet (604 billion US gallons; 2,288 billion litres) are stored in 9 lakes and reservoirs in

592-743: The Cheyenne watershed. Sedimentation is a major water quality concern for the Cheyenne watershed, potentially resulting in reduced storage capacity for reservoirs. Major water issues in the Cheyenne, reflect those of the larger Missouri River basin and stem from anticipated effects from a warming climate. Demand for water from agriculture for irrigation, greater threats to viable habitat for endangered species and wildlife are large concerns directly related to increasing temperatures and evapotranspiration. Water companies are also concerned about "water delivery" in response to shifting runoff periods. Similarly, power companies are concerned about climate effects on hydropower generation. As of November 2019, TC Energy

629-426: The Joint Line to handle over 400 million tons of coal. In 2006, Union Pacific set a record by hauling 194 million tons of coal – an 8% increase compared with 2005 tonnage. The company achieved this by increasing train size, with trains averaging more than 15,000 tons, a 200-ton weight increase compared with fourth-quarter 2005's average. In early 2016 it was reported that 80 to 100 trains of coal were being shipped from

666-448: The Powder River Basin, they will be going "down the sides of the bowl". This means that the overburden (rock lying over the coal) will increase as will the stripping ratio (the ratio of rock that needs to be moved to produce a ton of coal). The United States Geological Survey (USGS) has conducted a series of studies on the economic accessibility of coal in the major coal-producing regions of the country. The studies typically found that only

703-485: The Powder River Basin, with most of the active mining taking place in drainages of the Cheyenne River . The US uses about 600 million tons of coal a year, with about 40% of the coal coming from the Powder River Basin. The amount of coal coming from the Powder River Basin has been increasing over the last 20 years. The mines in the Powder River Basin typically have less than 20 years of life remaining. Almost all of

740-470: The Powder river basin every day. In 2019 train loadings averaged about 50 per day. 44°24′N 105°48′W  /  44.4°N 105.8°W  / 44.4; -105.8 Structural basin A structural basin is a large-scale structural formation of rock strata formed by tectonic warping ( folding ) of previously flat-lying strata into a syncline fold. They are geological depressions ,

777-526: The coal in the Powder River Basin is federally-owned, and further mine expansions will require a series of federal and state approvals, as well as large investments in additional mine equipment to begin the excavations. The majority of the coal mined in the Powder River Basin is part of the Fort Union Formation ( Paleocene ), with the low sulfur and ash content of the coal in the region making it very desirable. Coal supplies about one-fifth of

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814-435: The coal would become economic to produce. Increasing the price paid for coal can increase the amount of economically recoverable coal, but increasing the price of coal also increases its production cost. Because coal is a solid, it cannot be produced from many scattered wells like oil and gas can be. Rather, coal has to be produced from mines that expand slowly by moving massive quantities of overburden. Fifteen mines operate in

851-638: The field the 3rd largest source of natural gas in the United States. The region also contains major deposits of uranium , contained in sandstones. (See Uranium mining in Wyoming ). The Wasatch Formation ( Eocene ) contains the uranium ore "roll front" type deposits found in the Pumpkin Buttes District. Cameco Corporation subsidiary Power Resources Inc. operates uranium mines in the basin. In Spring 2005, coal extracted from

888-628: The first quarter of 2014. The Bell Creek Field is a Lower Cretaceous stratigraphic trap in the Muddy Sandstone . Discovered in 1967 by the Exeter Drilling Co. No. 33-1 Federal-McCarrell well, which found 27 feet of pay at a depth of 4500 ft. Recent controversy surrounds the extensive coalbed methane extraction in the region. In the last decade, nearly 7000 such wells have been drilled. An extensive network of gas pipelines connecting these wells has been built, along with

925-408: The inverse of domes . Elongated structural basins are a type of geological trough . Some structural basins are sedimentary basins , aggregations of sediment that filled up a depression or accumulated in an area; others were formed by tectonic events long after the sedimentary layers were deposited. Basins may appear on a geologic map as roughly circular or elliptical, with concentric layers. Because

962-426: The large area of the swamps, the organic material accumulated into peat bogs instead of being washed into the sea. Periodically the layers of peat were covered with sediments washed in from nearby mountains. Eventually the climate became drier and cooler. The basin filled with sediment and buried the peat under thousands of feet, compressing the layers of peat and forming coal. Over the last several million years, much of

999-590: The length of the southern section of the Powder River Basin. A third railroad, the Dakota, Minnesota and Eastern Railroad , faced strong resistance from many parties for its attempts to extend its rail line into the coal mining area, but while the plan was eventually approved by regulating authorities, the project was abandoned after the railroad was purchased by the Canadian Pacific Railway . In 2013, five coal export terminals were being proposed in

1036-479: The line was single track for almost its entire length, and it was handling 19 million tons of coal. The implementation of the second stage of the Clean Air Act (1990) caused demand for clean coal to rise quickly. The C&NW struggled to upgrade capacity to dual track, resulting in numerous failures on the line in 1994, and eventually Union Pacific's purchase of C&NW in 1995. The UP spent $ 855 million over

1073-563: The mines would retail at the mines for around $ 5 a ton. However, power stations and plants in the eastern United States were paying over $ 30 a ton – the difference caused by the cost of transportation. (In October 2008, the mine-mouth price of Powder River Basin coal was closer to $ 15 per ton.) To transport coal from the basin, there is a joint railway line owned by the BNSF Railway and the Union Pacific Railroad running

1110-613: The next five years expanding capacity over its entire network to handle coal shipments from the PRB. By 2005 the Joint Line capacity had grown to handle an all-time record 325 million tons, and was either dual or three track capacity for its entire length. Due to various trackage and locomotive failures on the Joint Line in late 2004 and early 2005, the line failed to deliver the amount of contracted coal supplies, and electricity rates increased by 15 percent. Coal customers threatened to evaluate alternate sources of energy and transportation, including

1147-1062: The north 13 miles (21 km) to Caballo, Wyoming ; and then for 103 miles (166 km) to Shawnee in Converse County . The Chicago and North Western Railway ran close to the northern section, as did the Union Pacific at Caballo. In 1982 C&NW and the UP formed Western Railroad Properties, Inc. (WRPI), to acquire half interest in the Burlington Northern coal line from Shawnee Junction to Coal Creek Junction. On December 15, 1986 WPRI purchased 11 miles (18 km) more of BN line from Coal Creek Junction to East Caballo Junction. Beginning June 27, 1983 WPRI constructed six miles (9.7 km) of new railroad from Shawnee Junction. to Shawnee, rebuilt 45 miles (72 km) of C&NW line from Shawnee to Crandall and 56 miles (90 km) of new railroad from Crandall to Joyce, Nebraska . The first commercial train ran on August 16, 1984. By 1985,

Powder River Basin - Misplaced Pages Continue

1184-469: The overlying sediment has eroded away, leaving the coal seams near the surface. Powder River Basin (PRB) coal is classified as " sub-bituminous " and contains an average of approximately 8,500 btu/lb, with low sulfur . Contrast this with eastern, Appalachian bituminous coal containing an average of 12,500 btu/lb and high sulfur. PRB coal was essentially worthless until air pollution emissions from power plants (primarily sulfur dioxide, or "SO 2 ") became

1221-486: The production cost will also increase. The mines are largely non-union operations with a history of squelching labor activity. According to historian Ryan Driskell Tate, surface mining in remote areas happened to reduce some of the "occupational togetherness" typically associated with coal miners working shoulder-to-shoulder underground in Appalachia . The environmental impact of mining on grass and aquifers has been

1258-568: The production of second-place West Virginia , and more than the entire Appalachian region. The Powder River Basin is the largest coal-producing region in the United States. The region includes the Black Thunder Coal Mine , the most productive in the United States, and North Antelope Rochelle Mine , the second most productive. In recent years, the region has become a major producer of natural gas, both conventional natural gas and coal-bed methane . The Powder River Basin contains

1295-547: The river forming an arm of Lake Oahe. The Belle Fourche River is the largest tributary of the Cheyenne. Rapid, Sulphur , Plum, Cherry, and Owl Creeks are important other tributaries of the Belle Fourche-Cheyenne. Snowmelt from the Black Hills provides the major source of river water. Because of the proximity to the Black Hills and its mining industry, the Cheyenne historically picked up large quantities of zinc, arsenic, and cyanide. Those pollutants are no longer

1332-453: The strata dip toward the center, the exposed strata in a basin are progressively younger from the outside in, with the youngest rocks in the center. Basins are often large in areal extent, often hundreds of kilometers across. Structural basins are often important sources of coal , petroleum , and groundwater . Cheyenne River Formed by the confluence of Antelope Creek and Dry Fork Creek in Wyoming, it rises in northeastern Wyoming in

1369-435: The thick section of Cretaceous rocks. There is a recent resurgence in oil and gas production as a result of horizontal drilling and hydraulic fracturing . This resurgence is occurring mainly in the Wyoming portion of the basin, which is historically known as the source of the basin's oil. In 2009, a low of 38,000 barrels of oil per day were produced in the basin. That number has risen dramatically to 78,000 barrels per day in

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