Mechanism
The DRC's 2018 Mining Code (Loi n° 18/001) established a tiered royalty architecture: base metals at 3.5%, precious metals at 3.5%, strategic minerals at 10%. At enactment, the strategic mineral list comprised three substances: cobalt, germanium, and coltan (columbite-tantalite ore).
The May 29, 2026 Council of Ministers decrees expand the strategic mineral list by six substances:
- Lithium — covers Manono and other lithium concessions (AVZ Minerals, Lithium Africa, COMINIÈRE joint ventures)
- Tantalum — covers refined tantalum products; coltan ore (the tantalite-bearing precursor) was already classified as strategic
- Niobium — covers any DRC niobium-bearing operations
- Tungsten — covers tungsten operations, largely in eastern DRC conflict-adjacent zones
- Uranium — covers uranium operations including legacy assets at Shinkolobwe (currently inactive)
- Rare earth elements — covers any active or emerging REE exploration and extraction
The royalty mechanism is straightforward: extraction of any substance now classified as strategic triggers the 10% ad-valorem royalty on wellhead value, up from 3.5% under the base-metal rate. For operations producing tantalum, lithium, niobium, tungsten, uranium, or REEs, this is an approximately 186% increase in royalty burden on those specific material streams.
Relationship to ARECOMS (April 2026). The April 10, 2026 ARECOMS decrees created a strategic mineral reserve and export-quota mechanism for existing strategic minerals. The May 29 decree operates at a different level: it expands the classification itself, bringing six new substances under both (a) the 10% royalty and (b) the ARECOMS export-quota framework as a downstream consequence — significantly extending ARECOMS's jurisdictional reach.
Primary source note. RTNC (Radio Télévision Nationale du Congo) is the DRC's official state broadcaster and the authoritative communication channel for Council of Ministers decisions. The mines.gouv.cd decree-registry had not indexed specific decree numbers as of early June 2026; this filing uses RTNC as the primary official source pending Journal Officiel and mines.gouv.cd publication.
Downstream implications
- Manono lithium project — AVZ Minerals / COMINIÈRE / Dathomir Mining Resources face a step-change in royalty: 10% vs 3.5% on lithium production significantly compresses project economics. Pre-feasibility studies constructed on the 3.5% base-metal rate will require restating.
- Tantalum operations — DRC coltan operations already carried the 10% strategic-mineral royalty (coltan = columbite-tantalite ore). However, refined or processed tantalum products from DRC smelters may have been classified differently; this decree resolves any ambiguity in favour of the 10% rate for tantalum material streams at all processing stages.
- Tungsten / niobium / REE juniors — marginal operators active in eastern DRC (tungsten and cassiterite-heavy zones in North and South Kivu) will see a 186% royalty increase on tungsten-bearing concentrates. This may render sub-threshold projects uneconomic.
- Uranium legacy pathway — Shinkolobwe uranium is not in production, but any restart discussions or greenfield uranium exploration in DRC now carries a 10% royalty headline assumption.
- ARECOMS quota cascade — because ARECOMS export-quota authority applies to strategic minerals, the six newly classified substances automatically fall within ARECOMS's scope, creating a potential quota overlay on top of the royalty increase for lithium, tantalum, niobium, tungsten, uranium, and REEs.
Open questions
- What are the specific decree numbers adopted on May 29, 2026? RTNC references "two decrees" without numbering — mines.gouv.cd is the canonical source for the decree text and number.
- Has the Journal Officiel published these decrees, and what effective date does it specify? DRC mining conventions often have stability clauses that operators may invoke to contest retroactive royalty application.
- Does the reclassification automatically extend ARECOMS quota authority to all six new substances, or does a separate ARECOMS decree need to incorporate them into the quota schedule?
- What is the timeline for operator compliance? DRC conventions typically allow a transition period for fiscal-regime changes; it is unclear whether the Council of Ministers decrees provide one.