How bauxite is mined
Bauxite lies so close to the surface that miners often only have to scrape the soil off.
- stations
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- things downstream
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The short version
Bauxite usually lies near the surface, so a mine opens by clearing the ground. Crews take out the trees, peel off topsoil and overburden, then break the ore by drilling, blasting or bulldozing and truck it to a crusher. Pieces of about 7.5 cm go to an alumina refinery by belt, rail or ship, and the soil later goes back on the pit.
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Clear the land
Surveys map plants, animals and heritage sites first. Trees and vegetation then come off, and crews collect seeds and saplings for regrowing the site afterward.
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Strip soil and overburden
Topsoil is scraped away and stored, followed by the secondary layer known as overburden. Scrapers and small excavators expose the hard caprock on top of the ore.
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Break and load the ore
Caprock may need blasting, or scrapers may be enough. Excavators or loaders fill haul trucks with ore. Several pits run at once so the blend stays at a consistent grade.
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Crush for transport
A vibrating screen drops out fines while a jaw crusher breaks the big rocks, and sizers reduce everything further. Some mines also run wash plants, a simple step that removes clay. Conveyors, rail or ships then carry the ore to a refinery.
about 7.5 cm
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Refill and replant
Pit edges get smoothed, and overburden and topsoil go back on. Logs and rocks set aside during clearing return too, giving animals shelter and nesting sites.
Worth repeating
- Between 70% and 80% of the dry bauxite mined worldwide becomes alumina first and then aluminum.
- The waste from refining bauxite is a red sludge called red mud, with a pH around 13, about as alkaline as household bleach.
- Bauxite is almost always found near the surface with little or no overburden, so strip mining is the usual method.
Where it comes from
Ranking by bauxite mined, as given in the Wikipedia bauxite article.
Where it goes next
Bauxite feeds 2 lines directly and reaches 165 things in total.
Further down the line
Keep walking
Sources
Cite this page: "How bauxite is mined." Assembly Line, 2026-11-03. https://assemblyline.org/make/bauxite