Sodium Cyanide Heap Leaching for Gold: What Is It?

Sodium cyanide heap leaching, also known as cyanide leaching, is a widely used method for extracting gold from ore. Despite its long history, this technique remains controversial due to its environmental impact.

Currently, around 30% of global gold production relies on cyanide leaching methods. The process involves applying a cyanide solution to gold-bearing ore, dissolving the gold so it can be collected and refined.

You can read more about the technical principles on Dasen Ming’s website.

📈 Advantages

• Low cost
• High leaching efficiency

⚠️ Disadvantages

• Severe environmental risks, particularly due to the high toxicity of sodium cyanide.

🚫 Environmental Concerns

Traditional pool leaching with sodium cyanide has been included in official elimination or phase-out catalogues in many regions due to its risks. While modern methods like heap leaching and in-situ leaching are more controlled, they are still considered transitional technologies. Until safer alternatives are developed, strict regulation of cyanide use remains essential.

Because sodium cyanide is extremely toxic, it requires rigorous safety management throughout its storage, handling, and disposal.

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