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By the cyanide process, i.e. dissolving the gold in potassium cyanide solution, and then precipitating the metal; 5.

The cyanide process, introduced about 1890, is now one of the most important factors in the utilization of low-grade and refractory gold and silver ores.

Again the milling results were not good, and what it demanded was the cyanide process.

In the extraction of gold and silver from their ores by amalgamation, large amounts of metallic mercury have been utilized, but of late years the wide application of the cyanide process has decreased this use.

At the time that the outcrop in the Rand become exhausted, what is today known as the "cyanide process" had never been used in that part of the world.