Answer:
By virtue of Presidential Decree No. 461 dated May 17, 1974, the Bureau of Mines which was under the direct supervision and control of the Department of Agriculture and Natural Resources was transferred to the Department of Natural Resources. It was also on this date that the Mineral Resources Decree of 1974 (P.D. 463) was issued replacing Commonwealth Act No. 137 which provided, among others, for a modernized system of the administration and disposition of mineral lands.
P.D. 463 also mandated the division of the Philippines into five (5) mineral regions administered by offices then called Mines Regional Offices (MRO) under direct supervision by the Bureau of Mines and Geosciences, Central Office. However, MRO Region IV was actually organized and started exercising its functions and authority only on October 1, 1976 with jurisdiction over mining activities (except energy) in 17 provinces comprising Region III (Central Luzon), Region IV (Southern Tagalog) and municipalities of the National Capital Region.
In 1987, a year after the EDSA Revolution, then President Corazon C. Aquino issued Executive Order No. 192 which provided for a department-wide reorganization and integration. MRO-IV was merged with other Regional Offices of the Forestry, Environment, Lands and Research Sectors of the Department of Environment and Natural Resources (DENR) and was then officially known as the Mines and Geosciences Development Service (MGDS) of DENR Region IV headed by a Regional Executive Director.
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