In heap leaching,how is the cyanide concentration controlled, how is the dosage controlle?

In heap leaching, how is the cyanide concentration controlled, how is the dosage controlled, and how is it measured?

The optimal range for reagent concentration is generally between 0.2 and 7 parts per thousand. Silver nitrate testing is simple and fast, and it is used to adjust the dosage based on the test results. It’s recommended to add a small amount each time and repeat the process, rather than adding a large amount all at once.