Mines are found on every continent except Antarctica, concentrated in regions where geological forces have pushed valuable minerals close enough to the surface to extract. The largest mining operations cluster in a handful of countries: South Africa for gold and platinum, the Democratic Republic of the Congo for cobalt, Indonesia for nickel, Chile and Australia for copper and lithium, and China for rare earth elements and graphite. Where a mine ends up depends on the geology underneath, and that geology is shaped by billions of years of tectonic activity, volcanic eruptions, and ancient seabeds.
Why Mines Form Where They Do
Mineral deposits aren’t randomly scattered. They form in specific geological settings driven by heat, pressure, and water movement deep underground. Continental volcanic arcs, where one tectonic plate slides beneath another, generate the heat and chemical conditions that concentrate metals like copper, gold, and silver into ore bodies. This is why the western edges of North and South America, running along the Pacific “Ring of Fire,” host some of the world’s largest copper and gold mines.
Sedimentary basins, formed over millions of years as layers of rock and organic material accumulate, trap different kinds of deposits. Uranium, for example, is often found in unconformity-associated deposits where sandstone sits on top of older igneous or metamorphic rock. Lithium forms in three main deposit types: underground brines (mineral-rich water trapped beneath salt flats), pegmatites (coarse-grained igneous intrusions), and sedimentary deposits. The famous “Lithium Triangle” spanning Chile, Argentina, and Bolivia holds massive brine deposits created by ancient evaporated lakes in the Andes.
Platinum group metals come from a different origin entirely, forming in mafic and ultramafic igneous rocks (dense, iron-rich formations that solidified from magma). South Africa’s Bushveld Complex, the source of most of the world’s platinum, is one such formation. Over time, erosion can wash these metals into rivers and streams, creating alluvial and placer deposits that have driven gold rushes from California to the Klondike.
Major Mining Regions by Mineral
The global mining map is surprisingly concentrated. Between 2020 and 2024, just a few countries dominated production growth for the minerals that power modern technology. Indonesia accounted for the vast majority of new nickel supply, driven by massive laterite mining operations across Sulawesi and the Maluku Islands. The Democratic Republic of the Congo remained the world’s dominant cobalt producer, with most extraction centered in the copper-cobalt belt of the southeastern Katanga province. China continued to control graphite and rare earth production, with rare earth mining concentrated in Inner Mongolia and southern provinces like Jiangxi.
Lithium supply has been diversifying faster than other battery metals. While Australia and Chile remain top producers, a major portion of recent supply growth has come from emerging producers like Argentina and Zimbabwe. Argentina’s lithium operations are expanding rapidly across its northwestern salt flats, while Zimbabwe is developing hard-rock lithium mines from pegmatite deposits.
Copper mining centers on Chile (home to the world’s largest open-pit copper mine, Escondida), Peru, the DRC, and increasingly, the western United States. Gold mining is geographically widespread, with significant operations in Australia, Russia, Canada, the United States (primarily Nevada), South Africa, and Ghana.
Surface Mines vs. Underground Mines
Most of the world’s mining by volume happens at the surface. Open-pit mines, strip mines, and quarries are used when ore deposits sit relatively close to the surface. These operations are visible from space and can span several kilometers across. The Bingham Canyon copper mine in Utah, for instance, is over 4 kilometers wide and more than 1.2 kilometers deep.
Underground mines go far deeper. The world’s deepest active mine is the Mponeng Gold Mine in South Africa, reaching 4.0 kilometers (2.5 miles) below the surface. South Africa dominates the list of deepest mines globally, with four of the top five all extracting gold from the Witwatersrand Basin, a geological formation that has produced roughly 40% of all gold ever mined. The TauTona Mine reaches 3.9 kilometers, followed by Driefontein at 3.4 kilometers and Kusasalethu at 3.4 kilometers. At these depths, rock temperatures exceed 60°C (140°F), requiring massive refrigeration systems to keep miners safe.
Mines in the Ocean
Mining isn’t limited to land. The deep ocean floor contains polymetallic nodules, potato-sized rocks rich in manganese, nickel, cobalt, and copper that formed over millions of years on the abyssal plains. The largest known deposit sits in the Clarion-Clipperton Zone, a stretch of Pacific Ocean floor between Hawaii and Mexico spanning roughly 4.5 million square kilometers.
NOAA oversees licensing for U.S. companies seeking to explore and commercially recover these nodules in areas beyond any nation’s jurisdiction. Several countries and private companies hold exploration contracts in the Clarion-Clipperton Zone, granted by the International Seabed Authority. Commercial-scale extraction hasn’t begun yet, but pilot tests have taken place, and the regulatory framework for issuing commercial recovery permits is actively being developed.
How New Deposits Are Found
Modern mineral exploration relies heavily on technology that would have been unrecognizable a generation ago. Imaging spectroscopy, also called hyperspectral imaging, uses sensors on aircraft and satellites to identify minerals from their unique light signatures. The U.S. Geological Survey is currently using this technology through its Earth Mapping Resources Initiative to survey large portions of the arid western United States for undiscovered mineral deposits.
Satellite platforms like the European EnMAP mission, launched in 2022, and the planned NASA Surface Biology and Geology mission (expected in the late 2020s) are expanding the ability to detect mineral signatures from orbit. These tools can map exposed bedrock, identify promising geological formations, and even locate legacy mine waste. In Texas, for example, researchers used 16-band multispectral satellite data to map abandoned uranium mine features across several counties along the South Texas Coastal Plain. The same principles guide exploration for new deposits in remote, poorly mapped regions of Africa, Central Asia, and the Arctic.
Mining Near Sensitive Ecosystems
A significant number of mines operate in or near ecologically sensitive areas. Roughly 23% of large-scale metal mines and 20% of known ore deposits are located in areas of high terrestrial biodiversity. The overlap isn’t coincidental: the same geological forces that create rich mineral deposits, such as volcanic activity and tectonic uplift, also create the varied terrain and soil conditions that support diverse ecosystems.
The impact extends well beyond the mine footprint itself. Mining operations can pollute up to 1.8 million kilometers of downstream rivers globally, representing about 5% of the world’s total river length. Of those affected waterways, between 17% and 18% flow through conservation priority areas, including protected areas and key biodiversity areas. This downstream contamination through sediment runoff, acid drainage, and heavy metal leaching is often a larger ecological concern than the mine site itself, because it can affect water quality and aquatic life hundreds of kilometers from the source.