In order to expand and upgrade the mineral resources, a continuous programme of exploration is normal for the entire development process. When knowledge of the mineralisations is extensive enough, a calculation of the mineral resources is made, which is used in the evaluation of the deposit.
The evaluation stage includes surveys in several stages with increasing levels of detail. These aim to get an indication and more detailed knowledge of the opportunities for conducting profitable ore extraction. The scoping study forms the basis for the design of the application for a mining concession.