Abstract
The Ertsberg mining district is in the core of the Central Range of west New Guinea, a mountain belt created by arc/continent collision in the late Miocene/Pliocene. The district is best known for the Grasberg igneous complex (GIC), the host of a giant Cu–Au deposit that was emplaced at 3 Ma. Structural analysis revealed abundant evidence for three domains of strike–slip faulting in the deposit. The southwestern domain is dominated by E–NE-trending faults. The middle domain, the centre of highest grade ore mineralization, is dominated by NW-trending faults. The northeastern domain is dominated by N-trending faults. Dip–slip normal faults are subordinate. Faults inside and outside the GIC formed in a left-lateral Riedel shear system trending ∼N60W.
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