The Townsville prospect is situated 4 km north-northeast of the Ok Tedi porphyry and skarn Cu-Au mine, Papua New Guinea. Cu-Au mineralization is hosted in several breccia bodies extending vertically for more than 800 metres within Middle Miocene Pnyang Formation and underlying Early to Middle Miocene Darai Limestone. Mineralization consists of an upper Au-Ag zone and a deeper Cu-Au-Ag zone with the two zones commonly being separated by 100-200 metres of barren or low-grade material. CITATION: Pollard, P J, Jongens, R, Smillie, R, Mollomb, M, Erceg, M and Olubas, P, 2019. Townsville Cu-Au prospect, Ok Tedi district, Papua New Guinea: a breccia system zoned from Cu-Au-Ag skarn to carbonate-base metals-gold mineralization, in Proceedings PACRIM 2019, pp 165169 (The Australasian Institute of Mining and Metallurgy: Melbourne).