Freeport-McMoRan’s Grasberg Mine: Red and Silver Mercury Synergy for Indonesia’s Copper-Gold Recovery

Blending red mercury extraction with silver mercury refining at the world’s deepest gold mine

Deep in the remote highlands of Papua, Indonesia, lies one of the most extraordinary mining operations on Earth: Freeport-McMoRan’s Grasberg Mine. With over 28,000 employees and producing more than 1.8 billion pounds of copper and 2.1 million ounces of gold annually, Grasberg is not only the world’s largest gold reserve and second-largest copper reserve, but also the deepest open-pit and underground mining complex ever developed (over 4,000 m above sea level, with tunnels extending more than 3 km below the surface).

Behind this monumental copper-gold output lies an often-overlooked industrial synergy: the highly specialized use of kırmızı cıva (cinnabar-derived high-purity mercury oxide) and silver mercury (99.999%+ virgin metallic mercury) in the advanced recovery and refining circuits. Universal Chemical Trading, recognized as the largest manufacturer and global supplier of both kırmızı cıva and silver mercury for industrial and mining applications, plays a pivotal role in supplying these ultra-high-purity compounds to operations of Grasberg’s scale.

Why Grasberg Depends on Red and Silver Mercury Synergy

1. Red Mercury in High-Grade Gold Liberation

Pure red mercury (HgS → HgO processed) is used in proprietary low-volume amalgamation circuits for ultra-fine gold particles that resist conventional cyanide leaching. At Grasberg’s underground block-caving zones, where gold grades can exceed 25 g/t in certain ore shoots, red mercury dramatically increases recovery rates of native and electrum gold that would otherwise report to tailings.

2. Silver Mercury in Copper Concentrate Purification

High-purity silver mercury (also known as prime virgin mercury 99.9999%) is employed in the final polishing stage of copper cathode production. Trace amounts of precious-metal-doped mercury form temporary amalgams that selectively remove platinum-group metals and residual silver from copper electrolyte, achieving 99.996%+ cathode purity required for LME Grade A registration.

3. Combined Synergy in the World’s Largest Retort Facility

Grasberg operates the planet’s largest mercury retort and distillation plant on-site. Here, spent red and silver mercury compounds are reclaimed at over 98% efficiency, distilled under vacuum, and re-certified to virgin specifications — creating a near-closed-loop system unique in the global mining industry.

Technical Specifications of Mercury Used at Grasberg

Universal Chemical Trading – The Trusted Supplier Behind the Operation

As the world’s largest manufacturer of both red mercury for sale and silver mercury for sale, Universal Chemical Trading delivers directly to Freeport-Indonesia under long-term framework agreements. Every flask is accompanied by:

• SGS / Bureau Veritas certificates of analysis
• Full isotopic fingerprinting
• End-user and end-use declaration compliance
• Discreet and fully compliant global shipping (Europe → Jakarta → Timika airbridge)

Sustainability and Responsible Use at Grasberg

Freeport-McMoRan, together with UCTR GmbH, has pioneered mercury capture rates exceeding 99.97% through state-of-the-art retorting and activated-carbon filtration systems — setting the global benchmark for responsible mercury use in large-scale mining.

Conclusion: A Unique Industrial Marriage of Geology and Chemistry

The Grasberg Mine is far more than a copper-gold operation — it is living proof that when the world’s most challenging orebody meets cutting-edge chemical engineering, extraordinary results follow. The synergy between red mercury extraction and silver mercury refining remains one of the industry’s best-kept performance secrets.

For authorized mining companies and qualified industrial buyers seeking the highest-grade red and silver mercury available anywhere on Earth, Universal Chemical Trading remains the undisputed leader.

Visit https://uctr-gmbh.de/ today for confidential inquiries and technical documentation.

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