One of the main procedures of mineral processing is to liberate or release the valuable minerals form the raw ores. The liberation process refers to the ores to be ground down to a number of similar sizes that the contents are visible.

The degree of liberation stands for the percentage of the mineral occurring as free particles to all the content. But it is difficult to determine how fine the raw mineral ores should be ground to produce a certain degree of liberation of the valuable mineral particles. It is usually based on the laboratory research and experience of field work to found out an economical degree.

This process can be very energy conservation and price saving because most of the coarse gangues are discarded in the early process.