A nickel mine is a mine that produces nickel. Some mines produce nickel primarily, while some mines produce nickel as a side-product of some other metal that has a higher concentration in the ore. [1]
A nickel mine is a mine that produces nickel. Some mines produce nickel primarily, while some mines produce nickel as a side-product of some other metal that has a higher concentration in the ore. [1]
Nickel occurs in two general types of ores, sulfides and oxides. The most important sulfide ore is pentlandite (Ni9S8) although many other nickel sulfides are known. Furthermore, nickel is often a constituent of iron sulfides such as pyrrhotite. The principal (i.e. economically most important) nickel oxides are nickeliferous limonite ((Fe1−xNix)O(OH)·nH2O). [1] [2] Pentlandite supplies an estimated 65% of the world's nickel but nickel laterites constitute the largest reserves.
Nickel content of its ores is often only a few percent by weight.
Sulfide ores are subjected to comminution followed by froth flotation. Pentlandite and related minerals separate with sulfides of copper, cobalt, and iron. [1]
Two hydrometallurgical methods have been developed to extract nickel and cobalt from nickel laterites, these processes are called sulphuric acid leaching and reduction roast-ammonia leaching. For high-magnesium silicates in lower profiles laterites the exploitation method used is smelting. [3]
According to the intergovernmental International Nickel Study Group, in 2017 the countries with the largest volume of nickel ore reserves are Australia (19.5 million metric tons), Brazil (10.5 million metric tons), Russia (7.5 million metric tons), New Caledonia (6.5 million metric tons), Cuba (5.5 million metric tons), and the Philippines (just under 5 million metric tons). [4] As of 2017, 33 countries produced nickel ore. [4] Nickel production increased from 2000 to 2013 (when it peaked), decreased from 2014 to 2016, and recovered from 2017 to 2018. [4]
As of 2017, the largest nickel mine operators are (in descending order of kilotonnes mined): [5]
Other large nickel producers include Jinchuan Group Ltd., [8] the largest nickel producer in China, [9] and Sherritt, [10] a Canadian company from Canada that refines nickel from lateritic ores and has operations in Canada, Cuba, Indonesia and Madagascar. [7]
According to the intergovernmental International Nickel Study Group, as of 2017, an estimated 75% of primary nickel usage went to stainless steel; 3.7% went to the battery industry; and the remainder went to other applications. [4] By 2023, approximately 65% of primary nickel usage went to stainless steel and 15% to the battery industry. [11]
A study was conducted by scientists Dan et al on the effects of Nickel smelting fumes, to do this they did the study on NIH/3T3 cells and in the lung tissue of rats. They found that the fumes that the NIH/3T3 cells were transforming into malignant cells meaning that high exposure to Ni-smelting fumes may be harmful as Ni-smelting fumes may be a potential carcinogen in mammalian cells. [12]
In the 2000s, a nickel boom began centered around Claver, Surigao del Norte in the Philippines; in 2017, the government of the Philippines (then the world's largest exporter of nickel ore) engaged in a crackdown against mine operators accused of violating environmental laws; the government closed the operations of 28 of the Philippine's 41 mining companies. [13] In 2020, the Philippines became the world's largest producer of nickel ore, after Indonesia halted nickel ore exports; both countries had extensively supplied China, the world's largest purchaser of nickel ore. [14] The two largest Philippine nickel companies are Nickel Asia Corp. and Global Ferronickel Holdings Inc.; both operate in the Surigao del Norte region. [15]
Nickel mines in the Philippines, while beneficial to the economy, have been harmful to both human health and well-being as well as to the environment. [16] One example of this is in the Mindoro Oriental region, where nickel mines have left behind toxic mine tailings. This has polluted the water, which is necessary for both humans to drink as well as for them to use for agricultural practices. The nickel mines have also destroyed lands that indigenous tribes have lived on for generations.
From 1953 to 1958 Nickel Rim mines operating around Sudbury, Ontario deposited their mine tailings in an impoundment near the mine. The water in the impoundment was later tested and found to have low pH and high concentrations of iron, sulphur and dissolved metals such as aluminum and nickel. This is due to the oxidation of the tailings (usually sulfide minerals like pyrrhotite). [17]
The limited oxygen diffusing into the layers [18] causes the tailings to oxidize over a longer period of time, for this reason the water at the impoundment is going to discharge water with high concentrations of iron and sulphate for at least the next 50 years. [19]
A study found that the Mount Keith Nickel Mine which is an open pit mine in Western Australia is sequestering [20] and storing large amounts of carbon dioxide through enhanced weathering of mineral waste, this means that this mine is offsetting approximately 11% of the annual greenhouse gas emissions released by this mine. [20]
Nickel, copper as well as cobalt deposits became the most sought-after mineral exploration sites worldwide by private companies and national governments, when nickel prices more than doubled from 2017 to 2021. In the US, the only lucrative nickel mine in Riddle, Oregon ceased operation in 1987 due to pollution concerns, but some sites are now actively re-explored as the federal government considers these deposits of strategic importance due to the increased domestic demand for electric vehicles. In 2020, highly valuable nickel, copper and cobalt occurrences were discovered near Tamarack, Minnesota. Environmental groups have expressed concerns over the potential pollution of the Kettle River headwaters, and the Mississippi watershed. The Environmental Protection Agency considers hardrock mining the top polluting industry in the US, and there is a long history of toxic emission problems at such operations around the world. [21] [22] Exploratory drilling near Tamarack occurred in 2022. [23]
Ore is natural rock or sediment that contains one or more valuable minerals concentrated above background levels, typically containing metals, that can be mined, treated and sold at a profit. The grade of ore refers to the concentration of the desired material it contains. The value of the metals or minerals a rock contains must be weighed against the cost of extraction to determine whether it is of sufficiently high grade to be worth mining and is therefore considered an ore. A complex ore is one containing more than one valuable mineral.
Limonite is an iron ore consisting of a mixture of hydrated iron(III) oxide-hydroxides in varying composition. The generic formula is frequently written as FeO(OH)·nH2O, although this is not entirely accurate as the ratio of oxide to hydroxide can vary quite widely. Limonite is one of the three principal iron ores, the others being hematite and magnetite, and has been mined for the production of iron since at least 400 BC.
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the form of magnetite (Fe
3O
4, 72.4% Fe), hematite (Fe
2O
3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe), limonite (FeO(OH)·n(H2O), 55% Fe), or siderite (FeCO3, 48.2% Fe).
Pentlandite is an iron–nickel sulfide with the chemical formula (Fe,Ni)9S8. Pentlandite has a narrow variation range in nickel to iron ratios (Ni:Fe), but it is usually described as 1:1. In some cases, this ratio is skewed by the presence of pyrrhotite inclusions. It also contains minor cobalt, usually at low levels as a fraction of weight.
Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, is a surface mining technique that extracts rock or minerals from the earth.
Vale Canada Limited is a wholly owned subsidiary of the Brazilian mining company Vale. Vale's nickel mining and metals division is headquartered in Toronto, Ontario, Canada. It produces nickel, copper, cobalt, platinum, rhodium, ruthenium, iridium, gold, and silver. Prior to being purchased by CVRD in 2006, Inco was the world's second largest producer of nickel, and the third largest mining company outside South Africa and Russia of platinum group metals. It was also a charter member of the 30-stock Dow Jones Industrial Average formed on October 1, 1928.
Nickeline or niccolite is a mineral consisting primarily of nickel arsenide (NiAs). The naturally-occurring mineral contains roughly 43.9% nickel and 56.1% arsenic by mass, but composition of the mineral may vary slightly.
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.
Falconbridge Limited was a Toronto, Ontario-based natural resources company with operations in 18 countries, involved in the exploration, mining, processing, and marketing of metal and mineral products, including nickel, copper, cobalt, and platinum. It was listed on the TSX and NYSE (FAL), and had revenue of US$6.9 billion in 2005. In August 2006, it was absorbed by Swiss-based mining company Xstrata, which had formerly been a major shareholder.
Gaspéite, a very rare nickel carbonate mineral, with the formula (Ni,Fe,Mg)CO3, is named for the place it was first described, in the Gaspé Peninsula, Québec, Canada.
Violarite (Fe2+Ni23+S4) is a supergene sulfide mineral associated with the weathering and oxidation of primary pentlandite nickel sulfide ore minerals.
The Widgiemooltha Komatiite is a formation of komatiite in the Yilgarn Craton of Western Australia.
Creighton Mine is an underground nickel, copper, and platinum-group elements (PGE) mine. It is presently owned and operated by Vale Limited in the city of Greater Sudbury, Ontario, Canada. Open pit mining began in 1901, and underground mining began in 1906. The mine is situated in the Sudbury Igneous Complex (SIC) in its South Range geologic unit. The mine is the source of many excavation-related seismic events, such as earthquakes and rock burst events. It is home to SNOLAB, and is currently the deepest nickel mine in Canada. Expansion projects to deepen the Creighton Mine are currently underway.
Lateritic nickel ore deposits are surficial, weathered rinds formed on ultramafic rocks. They account for 73% of the continental world nickel resources and will be in the future the dominant source for the mining of nickel.
Despite being a mineral rich country, Cameroon has only recently begun to investigate mining on an industrial scale. Strong metal and industrial mineral prices since 2003 have encouraged companies to develop mines here. The terrain mainly consists of granite-rich ground with areas of ultramafic rocks that are sources of cobalt and nickel. There are also deposits of bauxite, gold, iron ore, nepheline syenite, and rutile. Alluvial gold is mainly mined by artisanal miners.
Nickel mining in New Caledonia is a major sector of the New Caledonian economy. The island contains about 7.1 million tonnes of nickel reserves, about 10% of the world's total. With an annual production of 200,000 tonnes in 2020, New Caledonia was the world's fourth largest producer after Indonesia (760,000), Philippines (320,000), and Russia (280,000), followed by Australia (170,000) and Canada (150,000).
Nickel mining in Western Australia has been an industry that has had many fluctuations of fortune in its history. Large fluctuations in the world nickel price have seen mines close and reopen on several occasions.
Millerite or nickel blende is a nickel sulfide mineral, NiS. It is brassy in colour and has an acicular habit, often forming radiating masses and furry aggregates. It can be distinguished from pentlandite by crystal habit, its duller colour, and general lack of association with pyrite or pyrrhotite.
Nickel mining in Indonesia began with small-scale exploratory mining operations during the Dutch East Indies era and began to expand in the 1960s. Most of Indonesia's proven nickel reserves are located in the islands of Sulawesi and Halmahera, and the country has the largest annual production and reserves of nickel in the world.
Gordon Lake Mine was an underground copper mine near Werner Lake in the Kenora District of Ontario Canada.