The NMA is headed by a Board of Directors, which is the governing body of the Agency and is responsible for overseeing key operational activities, including: approving operational budgets for the NMA, establishing strategic direction, ensuring organisational effectiveness, setting standards and assessing performance, approving operational policies and implementing and overseeing effective human resource management.

The Agency has a fully functioning organizational structure at its National Headquarters at New England Ville in Freetown, and expanding regional offices in Kenema, Bo, Makeni, Kabala, Lungi and Kono. This structure outlines how roles, responsibilities and activities are coordinated to achieve the overall vision and mandate of the Agency.

In 2013 the NMA started operations with the Office of the Director General (ODG) and four Directorates – Directorate of Geological Surveys (DGS); Directorate of Mines (DoM); Directorate of Precious Minerals Trading (DPMT) and the Directorate of Finance and Administration (DFA). The Directorate of Communication and Community Affairs (DCCA) and the Directorate of Technology and Information Management (DTIM) were established in 2014 and 2020, respectively. Below is the executive management team of the Agency.