Indonesia HPAL Nickel Ore Costs Rise as New HPM Formula Hits Limonite Feedstock

Nickel ore

Indonesia HPAL nickel ore costs are set to rise sharply after the government’s revised mineral benchmark price lifted the mandated price floor for limonite ore. The new HPM formula is expected to increase limonite ore costs by at least 50%, adding immediate margin pressure to mixed hydroxide precipitate producers.

The revised HPM for limonite ore containing 1.2% nickel, 0.1% cobalt and 2% chromium is calculated at $45.24/wmt under the updated Harga Mineral Acuan. That is around 50% higher than early April transacted prices of about $30/wmt for 1.2% limonite ore.

Indonesia HPAL nickel ore costs are also far above the previous benchmark level. Under the old formula, the HPM for similar ore was only $17.17/wmt, meaning the new benchmark is nearly three times higher.

The change matters because HPAL operations rely on limonite ore as feedstock to produce MHP, which is used in battery-grade nickel and cobalt supply chains. A higher government-mandated ore floor will raise raw material costs, increase royalty payments and pressure margins across Indonesia’s battery nickel industry.

Limonite Ore Repricing Raises MHP Cost Pressure

The new HPM framework has the strongest impact on limonite ore because this material typically trades closer to benchmark values than saprolite ore. HPAL producers therefore face a more direct cost increase than rotary kiln-electric furnace operators.

MHP producers will now have to absorb higher ore purchase costs and higher royalties. Since royalties are linked to official valuation, the total cost increase could exceed the headline 50% rise in limonite ore pricing.

The revised formula also changes how Indonesia captures ore value. It includes cobalt, iron and chromium in nickel ore valuation, making these contained elements taxable. This is especially important for limonite ore because cobalt content adds value to HPAL feedstock.

The correction factor for cobalt is set at 30% when ore contains at least 0.05% cobalt. Iron carries a 30% correction factor when content is 35% or lower, while chromium carries a 10% correction factor.

This means Indonesia is no longer valuing nickel ore mainly by nickel grade. The government is moving toward a broader contained-metal pricing model, capturing more value from battery-related by-products and ore chemistry.

For MHP producers, this creates a structural cost problem. HPAL projects were built around access to Indonesian limonite ore, sulphuric acid and integrated processing infrastructure. If ore costs rise by more than a third to half, the cost floor for MHP production moves higher.

This could affect downstream nickel sulphate and cathode material economics. Producers with stronger integration, lower acid costs and better logistics will be better positioned. Higher-cost operators may face squeezed margins if MHP prices do not rise enough to offset the new ore benchmark.

The change also comes as Indonesia tightens wider nickel policy. Mining quota uncertainty, export tax discussions and stricter pricing formulas all point to a broader state strategy of capturing more mineral value before material moves downstream.

Sulphuric Acid Tightness Adds a Second Cost Shock

Indonesia HPAL nickel ore costs are rising at the same time as sulphuric acid prices surge. This creates a double pressure point for MHP producers.

HPAL operations require large volumes of sulphuric acid to leach nickel and cobalt from limonite ore. Any disruption in sulphur or acid supply directly affects processing costs and production reliability.

The US-Iran conflict has stranded several sulphur cargoes bound for Indonesian HPAL producers, preventing them from transiting the Strait of Hormuz. As a result, producers have shifted toward buying sulphuric acid directly.

That market was already tight because of limited copper concentrate availability. Sulphuric acid supply is expected to tighten further as China suspends exports from May.

Southeast Asian sulphuric acid prices have risen sharply. Prices reached $277.50/t cfr on 9 April, up 71% from $162.50/t before the conflict.

This is a major issue for Indonesian HPAL plants. Higher limonite ore costs increase feedstock expenses, while higher sulphuric acid prices increase processing costs. Together, they raise the full cost of producing MHP and weaken the advantage of low-cost Indonesian battery nickel.

Saprolite ore faces less immediate disruption. Saprolite is mainly used in RKEF operations to produce nickel pig iron and ferronickel. Although the new HPM for typical saprolite ore containing 1.6% nickel, 18% iron and 2% chromium rises to $52.90/wmt from $29.94/wmt, it remains below early April transacted prices of about $70/wmt.

This means RKEF producers may see limited immediate transaction impact because market prices are already above the benchmark. HPAL producers, by contrast, face a direct reset of the cost floor.

The difference could reshape relative economics between Indonesia’s stainless-linked and battery-linked nickel chains. NPI producers remain supported by high saprolite prices, while HPAL producers now face rising limonite, royalty and acid costs.

For the global battery supply chain, the key risk is that Indonesia’s MHP cost curve shifts upward. That could support nickel sulphate prices over time, especially if acid tightness persists or HPM-linked royalty costs remain elevated.

For Indonesia, the policy strengthens resource rent capture. The government is recognising that limonite ore contains not only nickel but also cobalt and other valuable elements. This gives Jakarta a stronger fiscal claim over battery material feedstock.

However, the policy also increases operating uncertainty. HPAL investors need predictable ore pricing, acid availability and tax treatment to justify large-scale expansion. A sharp change in HPM could force producers to revisit cost assumptions, procurement strategies and product pricing.

The Metalnomist Commentary

Indonesia’s new HPM formula marks a turning point for HPAL economics. The country is capturing more value from limonite ore, but the combined shock of higher ore prices, royalties and sulphuric acid costs could reset the cost floor for global MHP supply.