44 ARTICLE X Ancestral Domain, Ancestral Lands and Agrarian Reform SECTION 1. Ancestral Domain; Lands of Indigenous Cultural Communities. – Subject to the Constitution and existing laws, the Regional Government shall undertake measures to protect the ancestral domain and ancestral lands of indigenous cultural communities. All lands and natural resources in the autonomous region that have been possessed or occupied by indigenous cultural communities since time immemorial, except when prevented by war, force majeure, or other forms of forcible usurpation, shall form part of the ancestral domain. Such ancestral domain shall include pasture lands, worship areas, burial grounds, forests and fields, mineral resources, except strategic minerals such as uranium, coal, petroleum; and other fossil fuels, mineral oils, and all sources of potential energy; lakes, rivers, and lagoons; and national reserves and marine parks, as well as forest and watershed reservations. Until laws are enacted that provide otherwise, fifty percent (50%) of the revenues derived from the utilization and development of such strategic materials shall accrue to the Regional Government and the provinces, cities, municipalities, and barangay in the autonomous region. The sharing between the Regional Government and the local government units in the revenues derived from the strategic materials mentioned above shall be apportioned according to the formula set out in Section 5, Article XIII of this Organic Act. Lands in the actual, open, public, and uninterrupted possession and occupation by an indigenous cultural community for at least thirty (30) years are ancestral lands. SEC. 2. The constructive or traditional possession of lands and resources by an indigenous cultural community may also be recognized subject to judicial affirmation, the petition for which shall be instituted within a period of ten (10) years from the effectivity of this Organic Act. The procedure for judicial affirmation of imperfect titles under existing laws shall, as far as practicable, apply to the judicial affirmation of titles to ancestral lands.