The mining sector has long toyed with the idea that one site’s waste can become another’s feedstock. However, that concept is slowly maturing into something more strategic… In industrial symbiosis, materials, energy, water and services are shared across co-located operations to cut costs, shrink footprints and unlock new value streams. Think co-products, rather than by-products.
Structurally, cluster models like Finland’s Kokkola and Harjavalta hubs illustrate how metals refineries, chemical plants and recyclers can trade inputs/outputs based on shared infrastructure, providing a template that mining regions can emulate.
In mining and metals, early adopters are turning ore-processing residues into construction sand and blocks to help relieve the world’s sand crunch while reducing tailings management liabilities. Slags from steel and non-ferrous smelting are being valorised in cement and concrete, and classic industrial-symbiosis parks from adjacent industries show how waste heat and CO₂ can be channelled to neighbouring plants.
Symbiosis essentially reclassifies ‘waste’ materials as products, and so its potential runs deeper, even within mining applications. For example, many copper anode slimes and smelter dusts host metals such as tellurium, selenium, indium and germanium, which can, with the right technologies and business models be recovered. Red mud (residues from bauxite processing) often contains valuable metals, and pilots such as Rio Tinto’s work with Geomega, are targeting scandium, gallium and more. Coal fly ash is another emerging feed: US DOE-linked teams report rare earths extraction using mild, lower-impact leaching – a potentially faster route to ‘first tonnes’ than greenfield mines.
While in theory, symbiosis sounds simple (creating strategic value from materials that companies already move at scale, while doing less harm to the planet) it’s worth remembering that residues vary, and flowsheets may need to be modular and scalable to ensure resilience is baked into designs. Offtakes for minor metals can be thin, and policy support that rewards circularity (the EU/Nordics have useful precedents, like the Kalundborg Eco-Industrial Park) may be needed to encourage uptake. Robust characterisation of materials is also essential in assessing potential opportunities.
Could industrial symbiosis become key to the permitting and profitability of future mining and metals operations? Potentially. If this has tickled your interest, come join us on TheIntelligentMiner.com. Our editorial theme this month is ‘rethinking resources’ and we’re ready to welcome you.
Carly