An Antam official warns that reserves could be depleted within a decade, exposing the resource risk beneath the country’s smelter boom.
Indonesia’s economically recoverable nickel deposits could be exhausted in roughly 10 years if mining and processing capacity continue expanding without tighter management, according to a senior official at state-controlled miner PT Aneka Tambang.
Irwandy Arif, Antam’s president commissioner, said rapid smelter construction was accelerating ore consumption. Under a scenario in which production capacity rises to about 735 million tonnes, he estimated that higher-grade saprolite reserves could last only six years, while lower-grade limonite might remain available for about 16 years.
The 10-year warning is conditional. It is not a fixed geological expiry date.
Indonesia’s Geological Agency reported 18.55 billion tonnes of nickel ore resources in 2023, of which 5.33 billion tonnes qualified as reserves. Resources cover known mineral deposits; reserves are the portion considered commercially and technically recoverable under current conditions. Exploration, prices and processing technology can move material from one category to the other.
At Indonesia’s reported 2024 mining volume of 176.08 million tonnes, the aggregate reserve figure would imply around 30 years of supply if production, reserve estimates and ore grades remained unchanged. They will not. The shorter forecast reflects planned capacity growth and the fact that smelters cannot freely substitute one ore type for another.
Saprolite, which generally has a higher nickel grade, feeds rotary kiln-electric furnace plants producing nickel pig iron and ferronickel for stainless steel. Limonite is processed through high-pressure acid leach facilities to make battery intermediates. A shortage of one grade can therefore leave specialised plants underused even when other nickel deposits remain available.
Indonesia created this pressure through policy success followed by overexpansion. Its 2020 ban on raw nickel exports forced investment into domestic processing and turned the country into the centre of global supply. The US Geological Survey estimates Indonesia produced 62% of the world’s mined nickel in 2024.
That dominance also contributed to oversupply. New Indonesian output helped cut benchmark nickel prices by roughly half over three years, weakening miners elsewhere and compressing margins across the industry. Jakarta responded by reducing 2026 production approvals to about 250–260 million wet tonnes from 379 million tonnes in 2025.
Those approvals are issued through RKABs, government-approved annual work plans and budgets that determine how much each mining company may produce. The mechanism now serves three purposes at once: supporting prices, conserving reserves and allocating scarce ore among a growing number of smelters.
Supply tension is already visible. Indonesia imported 15.3 million tonnes of Philippine nickel ore in 2025, up 50%, and received another 11.4 million tonnes during the first seven months of 2026. Imports from the Solomon Islands have also begun arriving regularly.
For miners, the policy response points toward higher exploration spending and stricter recovery standards. Smelter operators face a different calculation: facilities designed around decades of cheap domestic feedstock may confront higher ore prices, import dependence or stranded capacity. Stainless-steel and battery investors must assess grade-specific supply, not simply Indonesia’s headline reserve total.
Irwandy’s deeper criticism concerns value. Indonesia still exports large volumes of intermediate nickel products rather than capturing the full economics of stainless steel, battery cells and finished electric vehicles. Extracting ore faster while remaining concentrated in intermediate processing would shorten reserve life without maximising domestic returns.
The next phase of Indonesia’s nickel policy must therefore reward exploration, recovery from tailings and conversion into higher-value products while limiting redundant smelter capacity. Projects whose economics depend on unrestricted ore growth now warrant much harder scrutiny.