The temperature should be above freezing. Long leaching times will occur at low temperatures, while high temperatures result in increased reagent consumption, both of which have drawbacks.

Extraction experiments generally last 24-48 hours. These experiments can be used to determine the alkaline and reagent consumption per ton of ore. The actual heap leaching period should be determined based on the oxidation level, particle size, and overall heap size of the ore.

Generally, for regular ore samples, 10 kilograms or more are required.

In the absence of obvious harmful elements, the suitable pH range is typically between 9 and 11. Excessively high pH values are detrimental and can affect the leaching rate. pH strips or small instruments are suitable for testing pH levels.

For ores with good oxidation, they can be directly stacked, while hard ores are generally below 3 centimeters in diameter.