Lombok Island is located in the central part of the tectonically active zone formed as a result of subduction of the Indo-Austrian Plate in the western part of the Banda Sea.
The Lombok geology is characteristic of island-arc territories and is represented by volcanic-sedimentary formations from the Late Oligocene to the Quaternary (Fig. 1). Intrusive rocks consist of diorites, dacites, breccia diatreme and tonalites. Porphyry mineralization is associated with the latter.
Hydrothermal changes are manifested throughout the island and are associated with conjugate systems of tectonic disturbances and fissures of the sub-latitudinal and meridional direction, which also control the zones of epithermal mineralization.