Whether the world faces critical-mineral shortages through 2035 may depend as much on miners' ability to reliably process and deliver usable material as on how many tonnes are actually mined, according to an analysis by GEM Mining Consulting.

Drawing on the International Energy Agency's 2035 outlook, GEM examined copper, lithium, nickel, cobalt, battery-grade graphite and magnet rare earths. Expected supply covers just 68% of lithium requirements, 74% of cobalt demand and 75% of copper needs. The six span much of the energy transition's material base — battery cathodes and graphite anodes, copper for grids and wiring, and the permanent magnets in electric motors and wind-turbine generators — which is why coverage gaps at this horizon matter to manufacturers and governments as much as to miners.

The largest deficits, however, do not necessarily signal the weakest supply chains. Graphite and magnet rare earths are projected to reach 96% and 107% supply coverage respectively, yet they carry GEM's highest chain-fragility scores — 89 and 95 out of 100.

That fragility pattern mirrors documented midstream concentration: China refines the large majority of the world's rare earths and accounts for most battery-grade graphite output. That dependence is now codified in Western policy. The EU's Critical Raw Materials Act, in force since 2024, sets 2030 benchmarks for extraction, processing and recycling and caps any single third country at 65% of EU annual consumption of a strategic raw material, while US Energy and Defense department programs have co-funded graphite and rare-earth processing capacity — the diversification gap GEM's fragility scores capture.

Lithium shows the greatest volume pressure, scoring 80 on GEM's Volume Scarcity Index, while copper scores 62. Cobalt combines a supply deficit with high chain fragility, scoring 78 on that measure.

Nickel presents the reverse problem. Supply is expected to cover 92% of requirements, but its chain-fragility score reaches 66, reflecting concentration in Indonesia and China and limited diversified refining.

The findings suggest that governments and industry need different solutions for different minerals: copper, lithium and cobalt call for dependable project development, while graphite and magnet rare earths need more diversified processing, technology and customers.

Reliable tonnes

GEM also argues that announced production capacity can exaggerate future supply, because nameplate output does not account for commissioning, ramp-up, product quality, customer qualification and operating disruptions.

In a worked example, those hurdles cut a hypothetical project's 100,000-tonne annual nameplate capacity to 60,200 tonnes of reliable output. GEM stressed that the assumptions illustrate its methodology rather than represent a market forecast.

The implication is that a smaller mining project with proven processing, qualified products and dependable infrastructure could carry greater strategic value than a larger resource without a viable path to customers. On that reading, the markers to watch between now and 2035 are commissioning schedules, qualification timelines and how much new processing capacity comes onstream outside today's concentrated hubs.

The broader message is that reserves alone are not supply: critical minerals must ultimately be financed, permitted, mined, processed, qualified and reliably delivered.