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Geology and mineralisation of the Kerimenge-Lemenge prospect, Wau district, Papua New Guinea

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Denwer, K P(Kim P) (1993) Geology and mineralisation of the Kerimenge-Lemenge prospect, Wau district, Papua New Guinea. Research Master thesis, University of Tasmania.

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Abstract

Mineralisation at the Kerimenge and Lemenge deposits, wau,
Papua New Guinea, is an example of a fault controlled,
porphyry-related, gold-carbonate-base metal epithermal system.
Repeated intrusion of Edie Porphyry (2.4 to 3.8 Ma) was
accompanied by a local permeability-generating phreatomagmatic
eruption to form a diatreme. Deposition of quartzmanganocarbonate-sulfide-telluride-gold
mineralisation was
controlled by the Kerimenge Fault within the Kerimenge Sill
Porphyry.
The gold mineralisation was deposited in two events. In the
first event, gold was deposited in four stages from convecting
meteoric water. The four stages are: Stage I quartz-pyriteminor
gold; Stage II quartz-pyrite-gold, Stage III carbonatequartz-arsenopyrite-gold
and Stage IV (mangano)carbonate-minor
gold. The mineral paragenetic sequence reflects cooling of the
system with Stage I and II veins deposited from a boiling CO2-
rich fluid with concomitant partitioning of volatiles
including CO2, and H2S into the vapour phase. Condensation of
the vapour phase higher and laterally within the system
resulted in deposition of Stage IV veins. Stage III veins are
regarded as transitional between Stages 1,11 and Stage IV.
Quartz-sericite/(illite)-pyrite-rutile+/-carbonate phyllic
alteration within the Kerimenge Sill Porphyry forms an selvage
to Stage I, II and III veins.
Gold is present throughout the four stages of mineralisation
but dominantly occurs in Stage II and III veins. Gold
occasionally occurs as electrum intergrown within Stage II
pyrite but in this study gold is observed to occur primarily
within the lattice of Stage II pyrite and Stage III
arsenopyrite. This mineralisation is not amenable to
conventional cyanide extraction. An uneconomic resource of
55Mt @ 1g/t Au has been delineated within this refractory
mineralisation (Hutton et al 1990).

Item Type: Thesis (Research Master)
Keywords: Geology, Gold ores
Copyright Holders: The Author
Copyright Information:

Copyright 1993 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Econ.Geol.)--University of Tasmania, 1994. Includes bibliographical references. Appendix in pocket at back of vol

Date Deposited: 08 Dec 2014 23:59
Last Modified: 11 Mar 2016 05:55
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