how is cyanide used in mining



species of fish. Cyanide tends not to accumulate in living organisms or biomagnify in the food chain. Cyanide use in mining Gold typically occurs at very low concentrations in ores – less than 10 g/ton. The most used process for gold extraction is hydrometallurgical recovery (gold cyanidation) which involves

Chemicals Used in Mining - Hesperian Health Guides

Cyanide is so dangerous that it has been banned in some countries. Sulfuric acid. Sulfuric acid is a toxic chemical used in copper mining. It is also a byproduct of many kinds of mining mixing with water and heavy metals to form acid mine drainage. Sulfuric acid smells like rotten eggs. Contact with sulfuric acid can cause burns blindness ...

Use in Mining | International Cyanide Management Code (ICMI ...

Use in Mining Introduction. Gold and silver typically occur at very low concentrations in ores - less than 10 g/t or 0.001% (mass... Manufacture Transport and Storage of Cyanide. Approximately 1.1 million metric tons of hydrogen cyanide are produced... Ore Preparation. Preparation of the ore is ...

Use of cyanide in mining activities | The Herald

Cyanide compounds are widely used by the mining industry to assist in the extraction of both precious and non-precious metals from rock. In gold mining cyanide solution is sprayed on crushed ore...

How is Cyanide Used to Mine Gold - Cyanide's Use In Gold Mining

The concentration of cyanide used in gold extraction is usually used at 100 parts per million to 500 parts per million. It is common practice for mining companies to use as little cyanide as they can in the extraction process for environmental safety and economic reasons.

Cyanide hazards to plants and animals from gold mining and ...

Cyanide extraction of gold through milling of high-grade ores and heap leaching of low-grade ores requires cycling of millions of liters of alkaline water containing high concentrations of potentially toxic sodium cyanide (NaCN) free cyanide and metal-cyanide complexes. Some milling operations result in tailings ponds of 150 ha and larger.

Turning Cyanide into Gold: Sodium Cyanide Applications in Mining

Cyanide has been used in the mining industry in some iteration since all the way back in the 1880s. Today the term “cyanide” conjures grisly images of a toxic poison but in reality cyanide is a naturally occurring element found everywhere from fruit to nuts to bugs.


Cyanide is a useful industrial chemical and its key role in the mining industry is to extract gold. Worldwide mining uses about 13 percent of the total production of manufactured hydrogen cyanide while the remaining 87 percent is used in many other industrial processes apart from mining (Environment Australia 2003).

CDC | Facts About Cyanide

Cyanide salts are used in metallurgy for electroplating metal cleaning and removing gold from its ore. Cyanide gas is used to exterminate pests and vermin in ships and buildings. If accidentally swallowed chemicals found in acetonitrile-based products that are used to remove artificial nails can produce cyanide when metabolized by the body.

The Safe and Effective Use of Cyanide - Society for Mining ...

The Safe and Effective Use of Cyanide Issue. The family of chemicals containing “cyanide” a combination of carbon and nitrogen has been used safely and... Background. Cyanide is used to make a number of things we use every day. Over 1.1 million tons of it is used annually in... Role of Cyanide in ...

The Current Status of Cyanide Regulations | E & MJ

Of the 1.1 million tons of hydrogen cyanide (HCN) produced annually only 6% is converted into sodium cyanide for use in the mining industry. The remaining 94% of hydrogen cyanide is used to produce a wide variety of products such as adhesives computer electronics fire retardants and nylon.

How Cyanide Leaching is Used in Gold Mining -

In mining operations that contain larger free-milling type gold deposits stamping and traditional gravity separation methods are more effective. Cyanide is used to extract gold from ore where it is spread throughout the ore in fine amounts.

The use of cyanide in gold mining - The Violence of Development

This figure is referred to in the book as X.XX (Page XX) In recent years the use of cyanide in gold mining has become the dominant means by which gold is extracted from a body of ore. The mercury amalgamation process had previously been used but recovered only about 60 per cent of an ore body’s gold. In contrast leaching finely ground ore with cyanide can recover up to 97 per cent of the ore body’s gold.

Cyanide Use in Gold Mining - Earthworks

How is cyanide used in mining? A sodium cyanide solution is commonly used to leach gold from ore. There are two types of leaching: Heap leaching: In the open cyanide solution is sprayed over huge heaps of crushed ore spread atop giant collection pads. The cyanide dissolves the gold from the ore into the solution as it trickles through the heap.

Should cyanide still be used in modern-day mining?

Toxic sodium cyanide has been used in gold mining since 1887 and it remains the primary reagent in use for gold processing today because it allows for efficient extraction of gold from low-grade ore. Since a tailings dam burst at gold mining company Aurul’s Baia Mare mine in Romania in 2000 leaking cyanide into the Somes River and killing large numbers of fish in Hungary and Yugoslavia the use of cyanide has been closely regulated in most countries and banned in others.

How is cyanide used in gold mining? - Quora

At mining operations open cut or underground cyanide solution is used to irrigate a crushed pile of ore (heap leach) or finely crushed ore-in-slurry (CIP/CIL) to rob gold freely exposed on crushed ore surfaces.

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how is cyanide used in mining