- Directly in charge in the administration and disposition of the country’s mineral lands and mineral resources;
- Undertake geoscientific surveys and researches in the fields of land and marine geology, mining, mine environment, metallurgy, mineral economics, and mine geodetic surveys;
- Recommends to the Secretary the granting of Mineral Agreements and endorses to the Secretary, for approval by the President, the granting of Financial or Technical Assistance Agreements (FTAA);
- Provide laboratory and other technical services to the public and other government entities;
- Provide technical assistance to local government units in their performance of devolved functions on small-scale mining and quarry/sand and gravel mining operations;
- Provide staff support and technical advisory to the Office of the Secretary on mining and geology matters; and
- Acts as Secretariat to the Mines Adjudication Board (MAB).