The Martabe Gold Mine is located on the boundary of the Batangtoru Forest, an ecosystem of high biodiversity value and the habitat of a number of threatened species including the Tapanuli Orangutan (Pongo tapanuliensis) and the Sumatera Tiger (Panthera Tigris Sumatrae). In relative terms, the active footprint of the Martabe Gold Mine is insignificant compared to the total area of this ecosystem; however, the impact on biodiversity due to forest clearing and other mine activities are recognised by the Company as a significant environment aspect of mine operations requiring careful management. The PTAR Code of Practice - Biodiversity Management sets out mandatory operational requirements for protection of biodiversity, such as minimisation of unnecessary clearing and the restoration of forest habitat as part of mine closure.

Measures for the protection of biodiversity at the site include strict controls on forest clearing, detailed fauna and flora surveys prior to clearing, protection of natural waterways, a ban on hunting or trapping of fauna, and the rehabilitation of disturbed areas after mining to support a native forest ecosystem suitable as habit for local fauna. A site nursery provides native tree seedlings in support of this rehabilitation program. The Company engages with biodiversity experts and Universities in support of its biodiversity management program and contributes to biodiversity protection more broadly in the Batangtoru Forest through sponsorship of local conservation NGOs.