Philsaga Mining Corporation, in collaboration with the DENR UNDP/GEF Biodiversity Corridor Project, began piloting procedures to establish a Reference Ecosystem and implement Biodiversity Expenditure Tagging within the mining tenement from March 9–13, 2026. This activity supports DENR Administrative Order No. 2022-04, which requires mining companies to designate 5% of their approved tenements as Biodiversity Reference Ecosystems.