The Office of the Mines and Geosciences Bureau (MGB) -Region III, prior to its creation as a regional center, was a mere Mineral District under Region IV in Quezon City. It was named Mineral District No III, which was created by virtue of Mines Administrative Order No. MRD 46, Series of 1985 that called for the creation of mineral districts in the different regional offices of the then Bureau of Mines and Geosciences (BMG).