Location | |
---|---|
Location within the ceremonial county of North Yorkshire | |
Location | Loftus, Saltburn-by-the-Sea [1] |
County | North Yorkshire |
Country | England |
Coordinates | 54°33′12″N0°49′28″W / 54.5534°N 0.8245°W |
Production | |
Products | Polyhalite Rock salt PotashPluS |
Production | Polyhalite 450,000 tonnes (500,000 tons) |
Financial year | 2017–18 |
Type | Underground |
Greatest depth | 4,600 feet (1,400 m) [2] |
History | |
Opened | 1968 1973 first shaft production 1976 full production | shaft sinking
Owner | |
Company | Israel Chemicals |
Website | Official website |
Boulby Mine is a 200-hectare (490-acre) site located just south-east of the village of Boulby, on the north-east coast of the North York Moors in Loftus, North Yorkshire England. [1] It is run by Cleveland Potash Limited, which is now a subsidiary of Israel Chemicals Ltd. (ICL).
In early 2016, polyhalite mining commenced. Polyhalite is a natural multi-nutrient fertiliser providing a source of potassium, calcium, magnesium, and sulfur. It is marketed as Polysulphate by ICL and is sold in 3 grades: granular, mini-granular and standard.
As well as producing Polysulphate, a granulated blend of potash and Polysulphate is sold as PotashPluS – part of ICL's wider FertiliserPluS product spectrum.
It originally produced half of the United Kingdom's output of potash, an agricultural fertiliser. The mined ore consists of 35–45% sylvite ("potash", specifically potassium chloride) and 45–55% halite (rock salt, or sodium chloride). [3] The rock salt is extracted as a by-product and used across the region as a de-icing agent on roads in winter conditions.
Other minerals are produced as waste (gangue) to the main effort, but may be sought after by mineral collectors, such as boracite, which occurs just above the beds of potash. [4] [5] [6] [7]
In 1939, potash was discovered in the area at Aislaby when prospectors were drilling to look for oil. The reserves were investigated in the 1950s but appeared too deep to exploit economically. Solution mining was considered from 1962, but not pursued. [8]
The first shaft was begun in 1968 and Imperial Chemical Industries (ICI) began construction on the mine in 1969, with potash from one shaft being produced in 1973. Full production of the mine did not commence until 1976. [9] The mine was the source of all of the UK's home-produced potash – around 55 percent of the total UK market. It occurs between 1.2 and 1.5 km (0.75 and 0.93 mi) below ground and has an average seam thickness of 7 m (23 ft). The mine did not achieve profitability until 1984. [3]
ICI formed Cleveland Potash Limited jointly with Anglo American, and later sold it to them, which in turn divested it to Israel Chemicals Ltd in 2002. [10]
In April 2011, the mine began the world's first commercial production of polyhalite, a rare mineral that has been found in large quantities in a seam out to sea from the mine, with total resources estimated at over a billion tonnes lying more than 0.93 miles (1.5 km) offshore. The mineral has a commercial potential as an inorganic fertiliser. [11]
In April 2014, Cleveland Potash was awarded a £4.9 million government grant to support the mining of polyhalite at the Boulby site [12] and parent company Israel Chemicals Ltd has pledged to invest £300 million in the area before 2018. [13]
Plans include extending the mine to the east and upgrading facilities to increase production capacity. Environmental groups have raised concerns that the development could have an intrusive effect on the local area. [13]
The mine had 1,001 employees in 2013 [14] and can produce up to one million tonnes of potash each year. [15] At 1,400 metres (4,600 ft) deep, it is the second deepest mine of any kind in Europe, and has a network of underground roads extending under the North Sea, totalling 1,000 kilometres (620 mi) in length. [16] Due to the mine's depth it takes workers seven minutes travelling in a lift to reach the bottom of the mine. [17]
Cleveland Potash Limited had a reported turnover of £194 million in 2013, up from £162 million the year before. However, despite the increased turnover, the company suffered a total pre-tax loss of £194 million. This was the result of a huge £200 million impairment charge arising from a significant fall in potash prices. [14] In the 2017–18 financial year, the company made £92 million, down from £205 million from the previous financial year. During the same period they also incurred losses of £162 million due to an investment in ICL Iberia a sister company. Taking into account redundancies, impairment of assets and disposal of unrequired assets, the loss was adjusted to £38 million. [18]
By the end of 2018, the company had 470 employees after a round of job cuts related to the switch from mining potash to polyhalite. [19]
In 2018, the company was producing just over 450,000 tonnes (500,000 tons) of polyhalite with ambitions to more than double that amount to over 1,000,000 tonnes (1,100,000 tons) by 2020. [20]
Much of the output from the mine is transported by rail, as the site is located south of Loftus along the route of the former WRMU (Whitby Redcar and Middlesbrough Union Railway), which was closed on 5 May 1958. [21] The line remains open from Saltburn to Boulby for goods traffic. Teesport handles most of the bulk cargo export from the mine, via a specific potash and rock salt terminal. [22]
Because of its depth, Boulby Mine is the site of the Boulby Underground Laboratory3,600 feet (1,100 m) below the surface (2800 metre water equivalent). Part of the laboratory is called Palmer Lab (subterranean) and the laboratory's surface facilities are sometimes called the John Barton surface facility.
Work being carried out at the underground laboratory includes the UK Centre for Astrobiology study of extremophile organisms that can survive in a salt-rich environment. [23] The site is also used for testing NASA Mars rovers.
In October 2017, the European Space Agency (ESA) sent astronaut Matthias Maurer as part of the fifth Mine Analogue Research sortie. It is thought that the brines present in the mine may be able to support extremophiles, and be like similar sites in caves on other planets. [24]
Extant testing and recording programmes at the laboratory include: [25]
There are also concurrent geological and geoscience projects ongoing. [28] [29]
Previous, now completed experiments include:
Proposed experiments (as of 2019) include the WATCHMAN (WATer CHerenkov Monitoring of ANtineutrinos, also called AIT/WATCHMAN) neutrino experiment, which would study antineutrinos originating from Hartlepool nuclear power plant. This project would aim to develop technologies to remotely monitor nuclear reactors for the purpose of nuclear non-proliferation.
Since the year 2000, there have been several incidents at the mine. Cleveland Potash Limited has been served with 11 notices for breaches of health and safety procedures by the Health and Safety Executive since 2012. [31] They include not taking appropriate measures to protect workers from the risks of explosion, falling ground and inadvertent entry into the mine shaft. Other incidents include;
Imperial Chemical Industries (ICI) was a British chemical company. It was, for much of its history, the largest manufacturer in Britain. It was formed by the merger of four leading British chemical companies in 1926. Its headquarters were at Millbank in London. ICI was a constituent of the FT 30 and later the FTSE 100 indices.
Polyhalite is an evaporite mineral, a hydrated sulfate of potassium, calcium and magnesium with formula: K2Ca2Mg(SO4)4·2H2O. Polyhalite crystallizes in the triclinic system, although crystals are very rare. The normal habit is massive to fibrous. It is typically colorless, white to gray, although it may be brick red due to iron oxide inclusions. It has a Mohs hardness of 3.5 and a specific gravity of 2.8. It is used as a fertilizer.
ICL Group Ltd. is a multi-national manufacturing concern that develops, produces and markets fertilizers, metals and other special-purpose chemical products. ICL serves primarily three markets: agriculture, food and engineered materials. ICL produces approximately a third of the world's bromine, and is the world's sixth-largest potash producer. It is a manufacturer of specialty fertilizers and specialty phosphates, flame retardants and water treatment solutions.
Boulby is a hamlet in the Loftus parish, located within the North York Moors National Park. It is in the borough of Redcar and Cleveland, North Yorkshire, England. The hamlet is located off the A174, near Easington and 1-mile (1.6 km) west of Staithes.
The UK Dark Matter Collaboration (UKDMC) (1987–2007) was an experiment to search for Weakly interacting massive particles (WIMPs). The consortium consisted of astrophysicists and particle physicists from the United Kingdom, who conducted experiments with the ultimate goal of detecting rare scattering events which would occur if galactic dark matter consists largely of a new heavy neutral particle. Detectors were set up 1,100 m (3,600 ft) underground in a halite seam at the Boulby Mine in North Yorkshire.
SNOLAB is a Canadian underground science laboratory specializing in neutrino and dark matter physics. Located 2 km below the surface in Vale's Creighton nickel mine near Sudbury, Ontario, SNOLAB is an expansion of the existing facilities constructed for the original Sudbury Neutrino Observatory (SNO) solar neutrino experiment.
The Whitby, Redcar and Middlesbrough Union Railway (WRMU), a.k.a. the Whitby–Loftus Line, was a railway line in North Yorkshire, England, built between 1871 and 1886, running from Loftus on the Yorkshire coast to the Esk at Whitby, and connecting Middlesbrough to Whitby along the coast.
The Sanford Underground Research Facility (SURF), or Sanford Lab, is an underground laboratory in Lead, South Dakota. The deepest underground laboratory in the United States, it houses multiple experiments in areas such as dark matter and neutrino physics research, biology, geology and engineering. There are currently 28 active research projects housed within the facility.
The Large Underground Xenon experiment (LUX) aimed to directly detect weakly interacting massive particle (WIMP) dark matter interactions with ordinary matter on Earth. Despite the wealth of (gravitational) evidence supporting the existence of non-baryonic dark matter in the Universe, dark matter particles in our galaxy have never been directly detected in an experiment. LUX utilized a 370 kg liquid xenon detection mass in a time-projection chamber (TPC) to identify individual particle interactions, searching for faint dark matter interactions with unprecedented sensitivity.
Mining in the United Kingdom produces a wide variety of fossil fuels, metals, and industrial minerals due to its complex geology. In 2013, there were over 2,000 active mines, quarries, and offshore drilling sites on the continental land mass of the United Kingdom producing £34bn of minerals and employing 36,000 people.
The ZEPLIN-III dark matter experiment attempted to detect galactic WIMPs using a 12 kg liquid xenon target. It operated from 2006 to 2011 at the Boulby Underground Laboratory in Loftus, North Yorkshire. This was the last in a series of xenon-based experiments in the ZEPLIN programme pursued originally by the UK Dark Matter Collaboration (UKDMC). The ZEPLIN-III project was led by Imperial College London and also included the Rutherford Appleton Laboratory and the University of Edinburgh in the UK, as well as LIP-Coimbra in Portugal and ITEP-Moscow in Russia. It ruled out cross-sections for elastic scattering of WIMPs off nucleons above 3.9 × 10−8 pb from the two science runs conducted at Boulby.
Richard Jeremy Gaitskell is a physicist and professor at Brown University and a leading scientist in the search for particle dark matter. He is co-founder, a principal investigator, and co-spokesperson of the Large Underground Xenon (LUX) experiment, which announced world-leading first results on October 30, 2013. He is also a leading investigator in the new LUX-Zeplin (LZ) dark matter experiment.
The Yorkshire Coast runs from the Tees estuary to the Humber estuary, on the east coast of England. The cliffs at Boulby are the highest on the east coast of England, rising to 660 feet (200 m) above the sea level.
Sirius Minerals plc was a fertilizer development company based in the United Kingdom. It was listed on the London Stock Exchange until it was acquired by Anglo American in March 2020.
Woodsmith Mine is a deep potash and polyhalite mine located near to the hamlet of Sneatonthorpe, Whitby in North Yorkshire, England. The venture was started by York Potash Ltd, which became a subsidiary of Sirius Minerals plc whose primary focus is the development of the polyhalite project. The project will mine the world's largest known deposit of polyhalite – a naturally occurring mineral. Because the project would require mining to be undertaken in the North York Moors National Park, many objections were raised to the mine and the proposed conveyor that would be installed to transport the raw material offsite to a plant on Teesside 23 miles (37 km) away.
The Woodsmith Mine Tunnel is a 23-mile (37 km) long tunnel that will stretch between Woodsmith Mine at Sneatonthorpe near Whitby in North Yorkshire and the Wilton International complex on Teesside, England. The tunnel has been in development since 2016, but cutting of the tunnel bore did not start until April 2019, with a projected finish date of 2021; it was, however, still not complete by December 2023, when more than 16 miles (25.8 km) had been dug.
Grinkle Mine, was an ironstone mine working the main Cleveland Seam near to Roxby in North Yorkshire, England. Initially, the ironstone was mined specifically for the furnaces at the Palmer Shipbuilders in Jarrow on the River Tyne, but later, the mine became independent of Palmers. To enable the output from the mine to be exported, a 3-mile (4.8 km) narrow-gauge tramway was constructed that ran across three viaducts and through two tunnels to the harbour of Port Mulgrave, where ships would take the ore directly to Tyneside.
Kilton Viaduct was a railway viaduct that straddled Kilton Beck, near to Loftus, in North Yorkshire, England. The viaduct was opened to traffic in 1867, however in 1911, with the viaduct suffering subsidence from the nearby ironstone mining, the whole structure was encased in waste material from the mines creating an embankment which re-opened fully to traffic in 1913. The railway closed in 1963, but then in 1974, it re-opened as part of the freight line to Boulby Mine carrying potash traffic.
Nigel Smith is a British Canadian astroparticle physicist and the Executive Director and CEO at TRIUMF.
The Boulby line is a freight-only railway line in Redcar and Cleveland, England. The line was opened in stages between 1865 and 1882, being part of two railways that met at Brotton railway station. Passenger trains along the line ceased in 1960, and since then it has been a freight-only line dedicated to the potash and polyhalite traffic from Boulby, and steel products into Skinningrove Steelworks.