Antimony Mining: China's Export Controls, Flame Retardants and the Critical Mineral Reshaping Defence Supply

Antimony's primary application is as a flame retardant, delivered as antimony trioxide, which is combined with halogenated compounds to prevent ignition in electronics, textiles, plastics and construction materials. Flame retardants account for roughly half of global antimony consumption. Lead-acid battery alloys represent the second-largest application category, where antimony hardens lead plates and improves battery performance and service life. Military applications are a growing demand component, particularly in ammunition where lead-antimony alloys are used for projectiles and tracer rounds, a use that contributed to antimony's Department of Defense critical mineral designation in the United States. Semiconductor and electronics applications, including infrared detectors and diodes, account for a smaller but strategically significant share of demand. Glass clarification in high-purity optics represents another established end use. This breadth of applications across flame retardancy, defence and advanced electronics gives antimony strategic importance across multiple industries simultaneously.

China is the world's dominant antimony producer, accounting for more than 80 percent of global mine output. Production is concentrated in Hunan, Guangxi and Yunnan provinces, with the Xikuangshan deposit in Hunan historically ranking as the world's largest single antimony operation. Outside China, Tajikistan is the most significant producer, followed by Russia, with smaller contributions from Bolivia, Australia, Turkey and Myanmar. China's dominance extends beyond mine production to processing: Beijing also controls the majority of global antimony smelting capacity and antimony trioxide production, meaning supply chain dependence on China operates at both the raw material and refined product level. This concentration is the primary driver behind Western critical mineral policy responses, including US Department of Defense project designations and allied government funding programs aimed at building non-Chinese antimony supply chains. Discovery Alert covers project developments across producing and emerging antimony jurisdictions.

Antimony has several established defence applications that contributed to its inclusion on the US Critical Minerals List with a Department of Defense designation. Lead-antimony alloys are used in military projectiles and tracer ammunition, where antimony improves bullet hardness and ballistic consistency. Antimony trioxide functions as a flame retardant in military vehicles, aircraft, naval vessels and electronic systems, providing fire protection for defence equipment across all platforms. Antimony-based semiconductors, particularly indium antimonide, are used in night-vision and infrared detector arrays. Antimony compounds appear in some explosive primer compositions. The combination of ammunition hardening, electronics fire protection and optical detection capabilities across multiple defence platforms is the basis for strategic interest in securing non-Chinese antimony supply chains. Discovery Alert covers US and allied government antimony project designations and supply chain developments as they occur.

Antimony's value reflects the combination of supply concentration, inelastic demand in critical applications and limited substitution options. China controls more than 80 percent of mine production and the majority of processing capacity, creating structural supply vulnerability that became apparent when Beijing imposed export restrictions in 2024. Demand for antimony is anchored in applications where its specific chemical properties are difficult to replace: antimony trioxide in flame retardants, lead-antimony alloys in ammunition and antimony-based semiconductors in infrared optics have no direct commodity substitutes at comparable performance and cost. The market response to China's export restrictions illustrated this dynamic: prices rose from approximately $11,000 per tonne to $51,500 per tonne through 2025. Western government designations of antimony as a critical mineral have further elevated strategic interest and driven investment in non-Chinese supply development, supporting price levels that make new project development economically viable.

Global antimony reserves are not exhausted in the near term, but accessible, high-grade supply outside China is limited. The United States Geological Survey estimates global antimony reserves at approximately 1.5 million tonnes, with China holding the largest share. The more significant concern is geographic concentration rather than absolute scarcity: with China controlling more than 80 percent of production, export restrictions or policy changes in Beijing can constrain global supply regardless of total reserve figures. Established deposits including China's Xikuangshan mine have experienced declining ore grades, increasing production costs at existing operations. Western governments have responded by funding exploration and development of antimony projects in allied jurisdictions, including Australia, Oman and Canada, to build strategic reserves and reduce dependence on a single dominant supplier. Discovery Alert covers these project developments as they advance across producing and emerging antimony regions.