Cobalt Mining: Two Very Different Operations, One Supply

Cobalt mining in the Democratic Republic of Congo genuinely happens two different ways at once, and the distinction between them is one of the most concrete, well-documented risks in the entire critical raw materials conversation, not an abstract policy concern.

Large-scale industrial mining

Most DRC cobalt comes from large, mechanised open-pit and underground copper-cobalt operations run by major mining companies, extracting ore at scale and sending concentrate onward, overwhelmingly to China, for smelting and refining into battery-grade cobalt chemicals. These operations are subject to conventional mine safety, environmental permitting, and corporate reporting standards, and their output is generally traceable back to a specific, named mine.

Whether a given block of ore is worth extracting at all, in either an industrial or (informally) an artisanal setting, comes down to a calculation every mining engineer runs before a shovel moves:

This single equation explains two real, observable patterns in cobalt mining: a falling cobalt price (covered on this material’s economics page) raises the cutoff grade, stranding ore that was profitable a year earlier without a single new regulation or geological change, and industrial operations, with lower unit processing costs C than informal hand-digging, can profitably work ore grades artisanal miners would reject, while artisanal miners focus on the highest-grade, easiest-to-reach material precisely because their effective C per tonne (manual labour, no heavy equipment) is structured completely differently.

Artisanal and small-scale mining (ASM)

Alongside the industrial mines, a substantial amount of DRC cobalt is dug by hand, by informal, small-scale miners working with basic tools, sometimes on land adjacent to or overlapping industrial concessions. Estimates of ASM’s share of total DRC cobalt output vary by source and year, but widely cited figures put it in the range of roughly 15 to 30 percent of national production, a significant minority, not a rounding error. This sector has been documented repeatedly by journalists, NGOs, and industry bodies to involve real, serious problems: unsafe working conditions, tunnel collapses, and child labour in some documented cases.

Because artisanal ore often enters the same supply chain as industrially mined ore once it reaches a trading depot or smelter, tracing exactly which cobalt in a finished battery came from which source has historically been genuinely difficult. This is a real, acknowledged supply chain transparency gap, not a hypothetical one.

Why this matters for supply chain resilience research

This is a case where the resilience question is not only about where the geology sits, covered separately, but about the social and governance conditions under which that geology is actually extracted. A supply chain that cannot fully separate its two sourcing streams carries a reputational and regulatory risk that a purely geological or price-based analysis would miss entirely, and the cutoff-grade mechanics above show why that risk does not stay fixed: it moves with the price cycle.

Sources: this section reflects widely corroborated reporting from organisations including the OECD, Amnesty International, and industry traceability initiatives (e.g. the Cobalt Institute, RMI); cutoff grade is a standard mining engineering concept; production figures reference the production data elsewhere on this site.