Gold Recovery Chemicals List: Doses, Prices, Options

Gold mining chemicals fall into five working categories: leaching agents (sodium cyanide and its non-cyanide replacements), pH modifiers like lime, adsorption media (activated carbon and resins), flotation reagents (collectors, frothers, modifiers), and oxidants for refractory ore. Sodium cyanide remains the industry’s dominant leaching agent — gold reagent production takes about 70% of world cyanide consumption, according to the gold cyanidation overview, with mining the main buyer named by Coherent Market Insights. But its price has moved sharply, and a real market of non-cyanide reagents now competes for the same ore.

This article covers the full list of chemicals used in gold mining, what each one costs as of the most recent published data, where mining process optimization chemicals are cutting reagent waste, and how to check whether the sustainable alternatives are cost-competitive for a given operation.

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Complete List of Chemicals Used in Gold Mining

Gold rarely occurs in a pure, free-milling form. Most ore requires chemical processing to separate gold from the surrounding rock matrix. Here is the working list of chemicals for mining industry operations processing gold:

• Sodium cyanide (NaCN): The principal chemical used in cyanidation to dissolve and recover gold from crushed ore. US spot pricing reached $3,295/tonne in Q2 2026, per IMARC Group market research.
• Lime (calcium oxide and calcium hydroxide): Added during cyanidation to maintain alkaline conditions and prevent the release of hydrogen cyanide gas.
• Activated carbon and resins: Used in Carbon-in-Pulp (CIP) and Carbon-in-Leach (CIL) processes to adsorb dissolved gold from solution.
• Flotation reagents: Collectors, frothers, and modifiers that separate gold-bearing sulfide minerals from waste rock.
• Oxidants and detox reagents: oxygen or hydrogen peroxide supply the oxygen cyanide leaching needs, while sodium metabisulfite with a copper catalyst destroys leftover cyanide in tailings (gold cyanidation overview).
• Zinc dust: precipitates gold (and silver) from pregnant solution in the Merrill–Crowe process.
• Non-cyanide leaching agents: Thiosulfate, halide-based solutions, and glycine-based systems — the fastest-growing category of gold mining reagents.

▶ How gold is mined and refined, from crushing and cyanide leaching to carbon recovery and refining. · 5:27

Gold Processing Chemicals by Plant Stage

Most gold reagents are easier to understand in the order a cyanide plant uses them. The chemistry below is standard for carbon-in-leach (CIL) and carbon-in-pulp (CIP) plants (gold cyanidation overview).

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Cyanide and lime doses in three gold plant designs

kg of reagent per tonne of ore

Refractory ore, where gold is locked in sulfides or carbon, is usually oxidised first by roasting or pressure oxidation in an autoclave. Barrick’s Goldstrike operation in Nevada does this, then leaches it by cyanide CIL; from late 2014 it also ran a calcium thiosulfate circuit for about four years, until changes in ore feed after Barrick and Newmont combined their Nevada operations let that ore go back to cyanide CIL (Goldstrike overview).

Note that sodium metabisulfite is a cyanide-destruction reagent, not an ore oxidant.

How much of each reagent a gold plant uses

Doses are set by testwork on each ore, so published feasibility studies are the best public guide. The Bomboré Phase II study in Burkina Faso reports 0.28 kg of sodium cyanide and 1.68 kg of quicklime per tonne for the operating oxide plant, and testwork values of 0.69 kg cyanide and 0.98 kg lime per tonne for the planned hard-rock circuit (Bomboré Phase II feasibility study, NI 43-101, 2023). The Katanning project in Western Australia plans 0.338 kg cyanide and 3.0 kg quicklime per tonne (Ausgold definitive feasibility study, June 2025), and says operating consumables including reagents make up 43% of its processing cost. An older US example, Newmont’s Rain mill in Nevada (1990s EPA site visit), added cyanide at an average 0.28 lb per short ton of ore and lime at about 1.7 lb per short ton (US EPA, gold technical resource document). In plain terms, cyanide doses are often under 1 kg per tonne, while lime doses are larger because acidic or sulfide-bearing ore eats lime.

Gold Mining Reagent Prices: What They Cost Right Now

Sodium cyanide priced at $3,295/tonne in the US as of Q2 2026, according to IMARC Group’s sodium cyanide price tracker. Another tracker, Intratec, reported US$1,840 per tonne for the US in November 2025, so published prices differ widely by source and contract basis (see also Market Research Future ). Older market reports from Coherent Market Insights gave market-size forecasts that are now out of date, so this page uses dated price points instead.

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US lime price at the plant

US$ per tonne, average value

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Sodium cyanide price by country, Q2 2026

US$ per tonne, IMARC assessment

Because sodium cyanide prices are reported quarterly, check IMARC Group’s live tracker or supplier quotes for the current quarter’s spot rate before budgeting a leaching campaign — the $3,295/tonne figure above is a Q2 2026 snapshot, not a fixed number.

Flotation reagents (collectors, frothers, modifiers) are bought through supplier contracts; market-size estimates such as one from GM Insights describe the whole mining sector, not gold plants, so they do not help budget one plant.

Price trackers report very different numbers. IMARC’s June 2026 figures range from US$1,748 per tonne in Indonesia to US$3,295 in the US (IMARC sodium cyanide price trend), while Intratec’s November 2025 series put the US at US$1,840 and South America at US$2,310 (Intratec sodium cyanide price). Treat both as reference points and price a plant on a delivered supplier quote, which adds freight, packaging and duties. Lime is far cheaper per tonne: US quicklime averaged about US$260 per tonne at the plant in 2025, against US$132.80 in 2021 (USGS Mineral Commodity Summaries 2026, lime). Because a plant uses several times more lime than cyanide by weight, lime can still be a large share of the reagent bill.

Flotation Reagents and Collectors for Gold-Bearing Ore

Flotation chemicals, collectors, and reagents matter most when gold occurs in complex sulfide ores or is disseminated through host rock rather than free-milling. Frothers, modifiers, and collectors — xanthates chief among them — let mineral particles attach to air bubbles rising through the ore slurry, so gold-bearing sulfides separate from waste rock. Xanthates remain one of the most widely used collector classes in gold and copper-gold flotation circuits globally.

Refractory ores — those that resist gold recovery even with cyanide present — need an additional oxidation step. Roasting or pressure oxidation in an autoclave breaks down the sulfide or carbonaceous matrix that otherwise locks gold away from the leach solution.

Sustainable Mining Reagents: The Non-Cyanide Alternatives

Sustainable mining chemicals are advancing on two fronts: replacing cyanide outright, and recycling the cyanide already in use. On replacement, three reagent families are active in commercial and pilot-scale operations:

• Thiosulfate leaching: Non-volatile, low acute toxicity, and effective on certain refractory and complex ore types where cyanide underperforms.
• Glycine-based leaching: A biodegradable amino-acid reagent system that avoids cyanide’s acute toxicity profile entirely.
• Halide-based leaching (bromide, chloride): Enables rapid gold dissolution at lower temperatures, useful for select ore types and electronic-waste gold recovery.

On replacement, Goldstrike in Nevada ran a calcium thiosulfate leach circuit at commercial scale for about four years from late 2014 (Goldstrike overview). On recycling, cyanide recovery doesn’t eliminate cyanide use, but it cuts fresh reagent purchase volume and reduces the amount of spent cyanide requiring detoxification and disposal — which matters when US prices were reported at US$3,295 per tonne in June 2026 (IMARC).

For a given ore, the practical comparison is ore-type suitability and reagent unit cost — not a blanket claim that one system is cheaper overall.

Comparison Table: Reagent Systems by Cost, Toxicity & Recovery Fit

This table compares the main leaching systems. Where no public price index exists, the cell points you to a supplier quote.

The quote-only rows reflect that thiosulfate, glycine, and halide reagents are still sold through direct supplier contracts rather than tracked on public commodity indices the way sodium cyanide is. If your operation needs a real quote, that’s the correct next step rather than trusting an averaged public number that doesn’t exist yet.

Mining Process Optimization Chemicals and Digital Dosing

Mining process efficiency chemicals increasingly pair with digital dosing systems rather than standing alone. Real-time monitoring of pulp density, pH, and reagent consumption lets operators trim overdosing — a direct lever on cost when cyanide was reported at US$3,295 per tonne in the US in June 2026 (IMARC). Closed-loop cyanide recovery is one version of this: it treats the reagent as a resource to recapture rather than a consumable to repurchase in full each cycle.

Farmonaut’s satellite-driven insights support this layer of process optimization by tracking environmental indicators tied to chemical use — tailings extent, water body changes, and vegetation stress near leach pads — over time, without requiring a site visit for every check. This gives operations teams and regulators a shared, dated record separate from internal reagent-consumption logs. Our platform offers carbon footprinting for mining operations, supporting compliance reporting as chemical process standards evolve.

Want to build reagent and environmental monitoring into your own systems? Try Farmonaut’s API for integration with mining chemical and environmental management workflows.

Safety, Handling & Regulatory Protocols

Given sodium cyanide’s toxicity, US and international gold operations run under a standing set of protocols rather than voluntary best practice. Here is the durable checklist a facility should be able to satisfy at any point, regardless of what year it is reviewed:

• Chemical handling training: Documented, role-specific training for every worker handling cyanide, lime, or flotation reagents.
• Storage and containment: Bunded, leak-proof storage rated for the specific reagent class, with secondary containment sized to the largest single container on site.
• Personal protective equipment: Spill-, fume-, and dust-rated PPE matched to each reagent’s safety data sheet.
• Continuous monitoring: On-site sensors plus remote/satellite detection of spills, leachate migration, or anomalous emissions.
• Certification against the International Cyanide Management Code: A voluntary but widely adopted standard covering production, transport, storage, use, and decommissioning of cyanide at gold and silver operations.
• Compliance with regional and national environmental law: Varies by jurisdiction — verify current requirements with the relevant state mining regulator or the US EPA before assuming a past compliance status still holds.

Because reagent prices and regulations both move, the way to keep this section current is procedural, not numeric: re-check the applicable Cyanide Code certification status and the current reagent SDS sheet on a fixed schedule rather than relying on a one-time audit.

The International Cyanide Management Code was developed under the United Nations Environment Programme; it accepted its first signatory companies in November 2005 and now lists over 240 signatories. Certified mines, producers and transporters are re-audited by independent auditors every three years (International Cyanide Management Institute). The Code covers transport, storage, use, decommissioning, emergency response and training, but it does not cover tailings dam design or long-term closure, which fall under national law (The Cyanide Code). Small-scale operators should never use mercury, and should only process ore from ground they hold a licence or permission for.

▶ Seven environmental impacts of mining, explained in clay. · 2:31

Farmonaut’s Role in Mining Chemical Monitoring

Farmonaut supports mining operations with satellite-based environmental tracking, resource management, and traceability tools relevant to chemical-intensive gold processing:

• Environmental change detection: Tracking tailings footprint, water clarity, and vegetation stress near leach and flotation circuits over time.
• Blockchain product traceability: Transparent tracking of gold from extraction through processing, supporting responsible sourcing claims.
• Fleet and resource management: Coordinating mining vehicle deployment to reduce reagent transport and logistics risk.
• Carbon footprint monitoring: Geospatial tracking of operational emissions for sustainability reporting.

Integrate with your technical team via our API Developer Documentation. For more on extraction methods that pair with these chemicals, see our guide to gold extraction processes and modern gold mining techniques. For sustainable processing practices specifically, see mining chemicals & solutions: sustainable processing tips and sustainable mining solutions at Sunshine Silver Mine.

Frequently Asked Questions

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The chemistry list itself has barely changed in a decade — cyanide, lime, carbon, and flotation reagents still anchor most gold circuits. What moves is price, and what is genuinely new is the recycling and non-cyanide reagent capacity being built alongside it. Track the reagent cost with the calculator above, verify the current cyanide spot price with IMARC Group before budgeting, and treat any non-cyanide reagent price as a direct-quote conversation until a public index exists for it.

Ready to monitor your gold mining operation’s chemical use, safety compliance, and environmental impact? Get started with Farmonaut’s dashboard or access our API for custom integration. For gold mine data by country, see our Canadian gold mines overview and our roundup of the world’s top gold mines.

How much cyanide and lime does a gold plant use per tonne of ore?

Published feasibility studies show about 0.28 to 0.69 kg of sodium cyanide and about 1 to 3 kg of quicklime per tonne (Bomboré Phase II, 2023; Katanning, 2025). Your own ore needs leach testwork.

Is thiosulfate still used at Goldstrike?

Goldstrike ran calcium thiosulfate for about four years from late 2014; after Barrick and Newmont combined their Nevada operations, a change in feed let that ore return to cyanide CIL after pressure oxidation, according to an Ausenco review filed with Oregon’s DOGAMI.