Lexi Webster
Australia has a rich history of mining and is one of the world's largest producers of several important ores and minerals. In 2021, Australia was the top global producer of bauxite, iron ore, rutile, zircon, and lithium. The country also has about one-fourth of the world's low-cost uranium reserves. Australia's economy is largely based on its natural resources, with the minerals sector contributing the most to the nation's exports. The country's mineral exports reached AU$415 billion during the 2023/24 period. But what is the most popular mineral in Australia?
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What You'll Learn
Iron ore
The principal iron ores contain hematite (Fe2O3) and magnetite (Fe3O4). Hematite is an iron oxide mineral that is non-magnetic and has colour variations ranging from steel silver to reddish-brown. Pure hematite contains 69.9% Fe by molecular weight. It has been the dominant iron ore mined in Australia since the early 1960s. Approximately 96% of Australia's iron ore exports are high-grade hematite, mostly mined from deposits in Western Australia.
Magnetite is another iron oxide mineral that is generally black and highly magnetic. Magnetite contains 72.4% Fe by molecular weight, which is higher than hematite. However, magnetite ores have a lower ore grade (20-30% Fe) due to impurities, resulting in higher production costs. Large magnetite deposits are found across Australia, and in 2018, the country had three producing magnetite projects: the Sino Iron Project in the Pilbara region of Western Australia and Savage River in Tasmania.
Australia was the world's largest producer of iron ore in 2019, and iron ore exports are a significant contributor to the country's economy. Iron ore is used to produce pig iron, an intermediate step in making steel. Blast furnaces in Australia, located at Port Kembla and Whyalla, smelt iron ore to produce pig iron, which is then processed to remove impurities and create steel. Steel can be coated with tin, zinc, or paint to protect it from rusting.
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Gold
Australia lays claim to many of the world's largest gold nuggets, most of which were discovered during the gold rush. While many of these nuggets were melted down or processed, replicas were often cast, and some large specimens have been discovered more recently, such as the Hand of Faith, found in 1980, and the Normandy Nugget, found in 1995.
Today, gold remains an important part of Australia's economy, with gold exports valued at AU$34 billion in 2023/2024, making it the country's fourth most valuable mineral export.
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Coal
History of Coal in Australia
In the 19th century, coal mining began in other regions of Australia, including Queensland, Victoria, Tasmania, and Western Australia. By 1901, Australia was exporting several million tonnes of coal annually. During the 20th century, coal played a crucial role in the development of New South Wales, and it became integral to the economy as a fuel source for locomotives and steam mills.
Australia is a major producer and exporter of coal, ranking fourth in global production and second in exports as of 2018. The country exports coal to various countries, including Japan, South Korea, Taiwan, and India. In 2018, Australia exported 387 million tons of coal, contributing significantly to its economy.
Domestic Use of Coal
Environmental Impact
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Precious stones
Australia has a rich history of mining and is known for its mineral diversity. The country is a significant producer of precious stones and is the world's largest producer of opal and diamond. It is also a major supplier of other precious stones, including sapphire, ruby, emerald, garnet, topaz, and jade.
Opal, the national gemstone of Australia, is composed of silica spheres and water. It is known for its unique characteristics, such as its brittleness when heated or struck and its ability to absorb impurities from water. Opal is highly valued in the gemstone industry and is often combined with Australian diamonds in jewellery design, creating a sophisticated and captivating fusion.
Diamonds from Australia, particularly those sourced from the Argyle diamond mine in Western Australia, are renowned worldwide for their exceptional quality. These precious stones come in a range of colours, from colourless varieties to the rare blue or pink diamonds, which are valued for their tint.
In addition to opal and diamond, Australia is a notable producer of sapphires. While Australia has since been surpassed by Madagascar as the largest producer, it still boasts abundant mining fields for sapphires, particularly in New South Wales and Queensland. Australian sapphires are known for their range of hues, including the captivating blend of yellow and blue tones found in Parti Sapphires.
Australia also contributes to the global emerald market, with Australian emeralds possessing unique qualities that set them apart from their Colombian counterparts. While Colombian emeralds are renowned for their intense green colour, Australian emeralds exhibit varying characteristics and are typically found in limited quantities.
The mining of precious stones in Australia has a long history, dating back to the First Nations peoples who quarried different types of stones for trade and use. The gold rushes of the 1850s further shaped Australia's mining industry and population growth, with many large gold nuggets being discovered during this period.
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Mineral sand deposits
Australia has the world's largest mineral sand deposits, which are a significant source of titanium, zirconium, and thorium. These deposits are the result of ancient rivers and seas leaching minerals from rocks and concentrating them into beach and dune deposits over millions of years. Wind and water then carried the lighter quartz grains out to sea, leaving the heavier minerals behind, which include ilmenite, rutile, zircon, garnet, magnetite, sapphire, diamond, and staurolite.
Mineral sands are mined using surface mining methods such as open-cut mining, suction dredging, and hydraulic mining. The first stage of the mining process involves removing all timber and topsoil from the mine site. The topsoil is stockpiled for later rehabilitation of the site after mining is completed. Suction dredging involves using a dredge to lift the ore from the bottom of an artificial pond created over low-grade deposits. Open-cut mining uses scrapers and bulldozers to mine higher-grade deposits, ensuring a constant blend of ore on a day-to-day basis. The screened ore then passes through spirals to remove tailings and excess clay fines, and the concentrate is stockpiled for further processing. Hydraulic mining uses a water cannon to wash the ore down, and the resulting slurry is pumped to a wet concentrator that separates the valuable minerals from the waste material.
Australia's mineral sand deposits have the potential to contribute significantly to the country's economy and create jobs, particularly in regional areas. The demand for mineral sands is expected to grow as the world transitions to a lower-carbon economy, and Australia is well-positioned to supply high-grade mineral sands to growing markets.
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Frequently asked questions
Australia is one of the world's top producers of iron ore, which is partly used in the domestic iron and steel industry, and is also exported to Japan, Taiwan, and South Korea. In 2021, Australia was the world's top producer of iron ore.
Australia is the world's biggest producer of lithium by weight and is also a leading producer of bauxite, gold, lead, diamond, rare earth elements, uranium, and zinc.
The opal is the national gemstone of Australia.
