Gold and lesser copper
mineralisation are associated with
porphyry-related vein systems periph-
eral to two separate inferred intrusive
centres north of Kainantu, Papua New
Guinea (PNG). The intersection of NW
trending structures, formed parallel to
the Markham Fault, with NE trending
transfer structures localise porphyry
intrusions, and control vein distrib-
ution.
The Arakompa veins intrude
pre-existing fractures in Akuna
granodiorite, located proximal to an
inferred porphyry. These veins are
characterised by early quartz and later
pyrite-chalcopyrite. Gold mineralis-
ation is associated with Bi-Te phases
in the sulphide veining. At Maniape, en
echelon gash veins occur within the
imbricate portion of a regional
structure. Maniape is a high level
carbonate-base metal gold system formed
distal to the same porphyry source as
Z ?-;4 kmmna