The Morobe Goldfield in Papua New Guinea has produced in excess of 120 tonnes of gold from predominantly alluvial
sources. Hardrock gold has been mined historically at Wau (23t) and Edie Creek (40 and geological resources have been
established at Hidden Valley (780, Kerimenge (360 and Hamata (30t). Numerous prospects have also been identified within
the goldfield. Primary gold mineralisation is related to intrusion of dacitic to andesitic Edie Porphyry (2.4 to 3.8 Ma), often with
associated diatremes, which have intruded along major regional structures. A full spectrum of deposit styles from proximal
(mesothermal) to distal (epithermal) to the porphyry source is recognised. The transition between the proximal and distal
styles is recognised both between deposits and within an individual deposit. The deposit styles should be termed porphyry
related gold mineralisation rather than given the generic epithermal and mesothermal labels.