Designing a strong minerals fiscal regime
In most producer countries, mineral resources are public assets. A strong fiscal regime determines how the value they generate is shared between private investors and the state. Five components are particularly important (figure 2).
Royalty design
Royalties can provide an early and relatively predictable revenue stream when calibrated appropriately. A sliding-scale royalty structure—indexed to commodity price or a profitability metric—enables the state to capture additional revenue during price booms while providing the industry with payments relief during cyclical downturns. This approach shares risk more equitably between investors and the treasury and promotes greater stability for both project economics and public revenues over the full life cycle. It’s equally important to transparently account for how royalty revenues are distributed to subnational governments and local communities, not just how much flows to the central government.
Corporate income taxation and ring-fencing
Corporate income taxation remains a fundamental pillar of mineral revenue capture. Without project-level ring-fencing and robust transfer pricing rules, taxable profits may migrate across jurisdictions or be offset against losses from unrelated operations. Specialized audit capacity, transparent cost recovery rules, and clear definitions of the taxable entity are essential elements of effective domestic resource mobilization.
Revenue authorities require both the legal framework and the technical capability to administer these provisions effectively. The OECD and the Extractive Industries Transparency Initiative (EITI) offer complementary frameworks that finance ministries can leverage: OECD guidance governs how related-party transactions are priced and taxed, while the EITI sets the standard for transparent disclosure of what companies pay and governments receive, including subnational distributions.7
Infrastructure cost accounting
Public co-investment in mining-enabling infrastructure such as roads, ports, power systems, and water supply should also be treated transparently in fiscal accounts and risk frameworks. Clear rules governing cost recovery, user tariff structures, and equity participation are necessary to prevent subsidy leakage. Fiscal risk statements should explicitly include exposures from infrastructure guarantees and co-financing arrangements, enabling legislatures and citizens to understand the full scope of the government’s financial commitment.
Infrastructure is often co-financed by external development finance institutions or export credit institutions, particularly in emerging producer economies. Where that happens, cost-recovery rules, guarantees, and tariff structures also need to satisfy the requirements of those financiers, whose participation frequently depends on the transparent fiscal arrangements.
Environmental closure and reclamation liability
Environmental closure costs can become a significant fiscal risk if not provisioned for in advance. Sinking funds, financial assurance bonds, escrowed reclamation accounts, and periodic reassessment of closure cost estimates are essential components of prudent fiscal design. These measures also reduce the risk of government inheriting unfunded liabilities by ensuring reclamation is planned from the project design stage.
Environmental liability management is a balance sheet protection issue for the national government, not solely a regulatory matter. Where regulatory and fiscal incentives align, post-closure mine assets can be repurposed productively. Former mine workings in Australia, for example, have been converted into pumped hydropower storage sites, generating clean energy and continued employment long after ore production has ceased, as at the Kidston project in Queensland.8
Managing windfalls helps protect long-term value
A well-designed royalty and tax regime should also prepare governments for periods of high commodity prices, when revenues can increase rapidly. Without effective fiscal management, such windfalls can be just as destabilizing as revenue shortfalls, fueling procyclical spending, inflationary pressures, or exchange rate appreciation that weakens the competitiveness of non-extractive sectors. Capital expenditures made during these price booms often create long-term operating cost obligations that continue long after the windfall has passed.
Sovereign wealth funds and fiscal stabilization funds are among the most widely used tools for managing this volatility. These funds are typically established by national governments to channel surplus resource revenues into diversified assets instead of the domestic economy. This approach helps insulate the exchange rate from commodity-driven swings and builds savings for future generations. Botswana has operated a mineral-linked sovereign fund since the 1990s through the Pula Fund.9 More recently, Namibia established the Welwitschia Fund in 2022, while Mongolia launched the Chinggis Khaan Sovereign Wealth Fund in 2024, which includes a dedicated “Future Heritage” account for intergenerational savings.10
