Introduction to the Special Issue Devoted to Alkalic Porphyry Cu-Au and Epithermal Au Deposits

This special issue is devoted to alkalic porphyry Cu-Au andepithermal Au deposits and focuses on two regions: BritishColumbia, Canada (Fig. 1), and the Southwest Pacific region(Australia and Papua New Guinea: Fig. 2). The special issuecommences with a review of Triassic to Jurassic metallogenyof British Columbia (Logan and Mihalynuk, 2014), then documentsore zones from several alkalic deposits (Central zone,Galore CreekMicko et al., 2014; Southwest zone, GaloreCreekByrne and Tosdal, 2014; Northeast zone, Mt. PolleyPass et al., 2014; Lower Main zone, LorraineBathet al., 2014; Mt. MilliganJago et al., 2014) and provides acomprehensive overview of mineralization in the Lorrainedistrict (Devine et al., 2014). Four contributions documentalkalic porphyry and epithermal deposits in New South Wales(NorthparkesHarris and Holcombe, 2014; Endeavour 41Zukowski et al., 2014; Endeavour 42Henry et al., 2014;CadiaHarris et al., 2014). The final contribution uses theresults of mapping and core logging in order to resolve thephysical volcanology and hydrothermal evolution of the giantLadolam alkalic epithermal gold deposit, Papua New Guinea(Blackwell et al., 2014). Eight of these papers are the outcomeof a collaborative project between the Mineral DepositResearch Unit (MDRU) at the University of British Columbia,the Australian Research Councils Centre for Excellencein Ore Deposits (CODES) at the University of Tasmania, andindustry partners. The remaining are based on work by theBritish Columbia Geological Survey (Logan and Mihalynuk,2014), Teck Resources Ltd. (Devine et al., 2014), a researchcollaboration between CODES and Newcrest Mining Ltd.(Harris et al., 2014), and the University of Queensland (Harrisand Holcombe, 2014).