Sodium Cyanide

1. What Sodium Cyanide Is and What It Does

Sodium cyanide is the chemical that turned gold mining from a mechanically intensive industry into a chemically intensive one — and in doing so made the global gold supply what it is today.

Before cyanidation (the process of using dilute sodium cyanide solution to dissolve gold from crushed ore), gold extraction relied on physical separation methods — gravity concentration, mercury amalgamation — that could only recover gold from relatively high-grade, free-milling ores where gold particles were large enough to see or to recover with physical techniques. The majority of gold in the earth's crust is not like that. It is disseminated through rock at microscopic concentrations, bonded to sulfide minerals, distributed at grades too low for physical separation to be economic.

Sodium cyanide solved this problem through chemistry. The cyanidation reaction — gold reacts with dilute sodium cyanide solution in the presence of oxygen to form the aurocyanide complex (Au(CN)₂⁻, a soluble gold-cyanide compound that remains in solution and can be recovered by adsorption onto activated carbon or zinc precipitation) — dissolves gold selectively from ore, leaving the surrounding rock matrix behind. The dissolved gold is then recovered from solution, stripped from the carbon or zinc, and refined to bullion.

Two industrial process variants dominate. Heap leaching: crushed ore is stacked on impermeable pads, irrigated with dilute cyanide solution that percolates through the ore, dissolving gold as it flows, and collected in ponds for processing. Heap leaching is suited to low-grade, oxide ores where the gold is readily accessible to solution. Large heap leach operations run continuously for years, consuming sodium cyanide at steady rates as they process millions of tonnes of ore per year.

Carbon-in-pulp and carbon-in-leach (CIP/CIL): finely ground ore is mixed with cyanide solution in large agitated tanks, with activated carbon added to adsorb the dissolved gold as it forms. CIP/CIL is suited to higher-grade ores and refractory ores where fine grinding is required to liberate gold particles. The process runs continuously, with cyanide added to maintain concentration as it is consumed.

Both processes require sodium cyanide as their primary reagent. No cyanide, no gold recovery. The two are inseparable at industrial scale.

2. The Gold Connection

Approximately 90% of global gold production operations use sodium cyanide at some point in the extraction process — a figure confirmed across academic literature, industry analysis, and patent filings (Laitos, 2013; Mudder and Botz, 2004; US Patent Office). This figure has been stable for decades — not because the industry hasn't looked for alternatives, but because cyanidation works at a scale and cost that no alternative chemistry has been able to match.

Gold production in 2026 is occurring against a backdrop of gold prices above $4,500 per troy ounce — the highest in history in nominal terms. At those prices, ore bodies that were uneconomic at $1,000/oz become viable. Marginal deposits get developed. Low-grade stockpiles get processed. The gold mining industry is running hard, and sodium cyanide consumption is running with it.

The ore grade dynamic compounds this demand growth. As the most accessible high-grade gold deposits have been worked down over decades, the industry has progressively moved to lower-grade ore bodies. Historical cyanide consumption was approximately 0.5–0.8 kilograms per tonne of ore at high-grade operations. At lower-grade operations, consumption has risen to 1.2–1.5 kilograms per tonne — and the number of tonnes processed per ounce of gold recovered increases dramatically. Lower grade means more cyanide per ounce on two dimensions simultaneously: more reagent per tonne and more tonnes per ounce (Mordor Intelligence, 2026).

The arithmetic is straightforward: higher gold prices drive more production, more production processes lower-grade ore, lower-grade ore requires more cyanide per ounce, cyanide consumption grows. The reagent demand grows structurally with the gold price cycle, not just proportionally with it.

Gold is tracked live on the ScarceEarth dashboard — the XAU price API feeds the gold price card. The supply chain behind every ounce of gold in that price card runs through sodium cyanide. The processed mineral and the reagent are the same supply chain, told from two different angles.

3. The Supply Structure

China is the world's largest sodium cyanide producer, with capacity estimated at more than 500,000 metric tonnes per year and a global market share of approximately 40–45% (HDIN Research, March 2026). Unlike rare earth processing — where China's dominance is near-total and stems from geological concentration and deliberate industrial policy — sodium cyanide production is more geographically distributed. The chemistry is well-understood, the raw materials (hydrogen cyanide and sodium hydroxide) are produced in multiple countries, and major Western mining companies have established supply relationships with non-Chinese producers.

The non-Chinese supply chain is real and functional. Cyanco is the largest dedicated sodium cyanide producer in North America, supplying major US and Latin American gold operations. Draslovka — a Czech-based chemical company that acquired Chemours' Mining Solutions business — has a significant global footprint serving European, African, and other markets. CSBP (a subsidiary of Wesfarmers) and Australian Gold Reagents produce sodium cyanide in Australia, serving the substantial Australian gold mining industry.

China's advantage is structural cost, not policy restriction. There are no Chinese export controls on sodium cyanide. The $1,780/MT Chinese domestic price versus the $3,248/MT US price reflects a production cost structure that combines lower energy costs, lower labor costs, and tighter integration with the hydrogen cyanide and sodium hydroxide feedstock industries that are larger and more competitive in China than in Western markets.

The 1.8x price differential has a direct operational implication for gold mining economics. A large heap leach operation consuming 1,000 tonnes of sodium cyanide per year pays approximately $3.25 million at US prices versus approximately $1.78 million at Chinese domestic prices. That $1.47 million per year difference compounds with other input cost advantages to produce a structural cost gap.

Environmental enforcement in China has been an intermittent source of supply disruption. Periods of intensified Chinese environmental enforcement — particularly around major political events or high-pollution alerts — have historically caused temporary production curtailments that tightened global NaCN supply and caused price spikes. These disruptions are not predictable from outside China and represent a supply reliability risk that Western gold producers must manage through inventory management and diversified sourcing.

4. Environmental and Safety Constraints

Sodium cyanide is one of the most strictly regulated industrial chemicals in commerce. It is acutely toxic — a lethal dose for humans is measured in milligrams per kilogram of body weight. It reacts with acid to release hydrogen cyanide gas, which is toxic at parts-per-million concentrations in air. Spills of sodium cyanide solution into waterways cause acute ecological damage.

The most visible historical incident is the 2000 Baia Mare spill in Romania, when a tailings dam failure released cyanide-contaminated water into the Danube basin, killing fish across hundreds of kilometers of river. The incident became the direct catalyst for the development of the International Cyanide Management Code (ICMC) — a voluntary certification program developed under the guidance of the United Nations Environment Programme and the International Council on Metals and the Environment, establishing standards for the production, transport, storage, and use of sodium cyanide in gold mining. Major gold producers and cyanide manufacturers participate in ICMC certification, which has significantly reduced the frequency and severity of spill incidents since the early 2000s.

The regulatory environment for sodium cyanide transport and storage adds logistical complexity that the price alone doesn't capture. Sodium cyanide is a Hazardous Material under US DOT regulations, subject to placarding requirements, restricted routing, driver certification, and emergency response planning. International shipping requires compliance with IMDG code requirements. These constraints mean sodium cyanide cannot be treated as an ordinary commodity.

For mining operations in remote locations — which describes a significant fraction of the world's gold mines — the logistics of cyanide supply are a significant operational consideration. Remote operations typically maintain 30–90 day cyanide inventories to buffer against supply disruptions. A supply disruption at the source propagates downstream to mine operations on the timeline of their buffer stocks.

5. Silver and Beyond

Gold is the headline application. It is not the only one.

Silver cyanidation follows the same chemistry as gold — silver forms a soluble silver-cyanide complex analogous to the gold aurocyanide complex. Many silver mines use cyanidation as their primary extraction method. Some operations process ore containing both gold and silver simultaneously, recovering both metals in the same cyanide circuit. The silver supply chain and the gold supply chain share the same reagent.

Electroplating is the second major application. Sodium cyanide is used in gold, silver, copper, and zinc electroplating baths — the electrolyte solutions in which metal is deposited onto a substrate by electrical current. Jewelry, electronics connectors, decorative hardware, and industrial components are electroplated using cyanide-based chemistry. The electronics supply chain has a sodium cyanide dependency that is separate from mining entirely.

Chemical synthesis uses sodium cyanide as a building block for producing a range of chemical intermediates. Adiponitrile (a precursor for nylon-6,6), methionine (an essential amino acid in animal feed), and various pharmaceutical intermediates are produced using hydrogen cyanide derived from sodium cyanide. These applications connect sodium cyanide to the food supply chain and the pharmaceutical supply chain in addition to the metals supply chain.

The diversity of applications means that sodium cyanide supply and demand dynamics are not purely a gold price story. An electronics manufacturing boom increases electroplating demand. An animal feed cycle affects methionine demand. Chinese environmental enforcement affects the entire demand base simultaneously because it constrains production from the world's largest producing country regardless of which application the cyanide was destined for.

6. Why It Belongs in the Reagent Layer

The gold price on the ScarceEarth dashboard is updated live. Gold trades at over $4,500 per troy ounce — a number that attracts investor attention, media coverage, and central bank reserve decisions at the highest levels of global finance.

The sodium cyanide price on this page is updated weekly. It trades at approximately $1,780 per metric tonne in China — a number that attracts almost no attention outside the mining chemicals industry.

The connection between those two prices is the point of this page.

Every ounce of gold tracked by the XAU price card was, with approximately 90% probability, extracted using sodium cyanide. The gold bar in a central bank vault, the jewelry in a retail display, the gold contact on a circuit board — the supply chain behind each of them includes a step where crushed ore was irrigated with dilute cyanide solution, the gold dissolved out, and the solution was processed to recover the metal.

The Reagent Layer exists because the supply chain story is incomplete without the chemistry. The neodymium price reflects demand for permanent magnets. The vanadium price reflects demand for grid storage. The gold price reflects demand for gold. But each of those prices has a supply chain that runs through chemicals the price doesn't directly reveal.

Sodium cyanide belongs in the Reagent Layer because it is the invisible input in the most visible commodity on the dashboard. The gold is tracked in real time. The reagent that produced it is tracked here. The supply chain behind the price runs through both.