Global Sulfur Crisis Drives up Refined Copper Sourcing Costs

Briefing

The severe global sulfur deficit, driven by disruptions in the Strait of Hormuz and export blocks, has spiked elemental sulfur prices above 1,000 dollars per ton. This chemical constraint has driven down sulfuric acid production. Sulfuric acid is the primary reagent for copper heap leaching, which provides approximately 14 percent of the world’s refined copper. Sourcing desks face elevated copper prices approaching 14,000 dollars per ton alongside lengthening lead times as mining operations in Chile and the Democratic Republic of the Congo reduce output. The global shortfall of elemental sulfur has reached 5.1 million tons.

Context

Before this disruption, metals procurement desks assumed copper cathode supply would remain comfortable due to anticipated production expansions in South America and Southeast Asia. Sourcing managers focused primarily on predicting demand from the energy transition and industrial electronics. The main question was whether electrical grid upgrades and artificial intelligence hardware deployment would squeeze copper availability by the end of the decade.

Analysis

Sulfur is produced mainly as a byproduct of oil and gas refining. Because it is a byproduct, its supply is inelastic and cannot rise quickly when prices jump. The closure of the Strait of Hormuz blocked approximately half of the seaborne trade of elemental sulfur, creating a severe shortage. China restricted sulfuric acid exports to protect domestic fertilizer manufacturing, cutting off merchant supply to the international mining sector. Sourcing copper via heap leaching requires ten tons of sulfuric acid for each ton of copper extracted. As sulfur prices rose toward 1,000 dollars per ton, the operating costs of leaching facilities escalated immediately. This pressure forces mine operators to scale back output or declare force majeure, which reduces the volume of refined metal arriving at wire mills and fabricators, raising global copper costs.

Parameters

• Elemental Sulfur Price ~ Sulfur prices surged past 1,000 dollars per metric ton across major global benchmarks, up from 200 dollars per ton in early 2025.
• Global Deficit Volume ~ A shortfall of 5.1 million tons of elemental sulfur remains unresolved in the international market.
• Heap Leaching Acid Requirement ~ Mining operations consume 10 tons of sulfuric acid to process each ton of refined copper cathode.
• Copper Cathode Price Level ~ Refined copper prices climbed above 14,000 dollars per metric ton as the leaching constraint reduced mine production.
• Leached Copper Production Share ~ Heap leaching processes account for approximately 14 percent of total global refined copper output.

Outlook

Buyers should expect copper prices to remain elevated and volatile until shipping routes in the Middle East normalize and feedstock supply pools are rebuilt. Sourcing managers must monitor Chinese custom filings and export quota updates for sulfuric acid in the coming weeks. The resumption of Chinese acid shipments represents the most immediate relief valve for South American and African copper leaching operations.

Verdict

Sourcing desks must adjust budgets for double-digit copper price increases and diversify their metals supply chains to secure domestic, non-leached cathodes.