An overview of vis-nir-swir field spectroscopy - Spectral International

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________________________________________________________________ Definition of deposit type IRON OXIDE COPPER GOLD (IOCG) Iron oxide copper-gold (IOCG) deposits encompass a wide spectrum of sulphidedeficient low-Ti magnetite and/or hematite ore bodies of hydrothermal origin where breccias, veins, disseminations and massive lenses with polymetallic enrichments (Cu, Au, Ag, U, REE, Bi, Co, Nb, P) are genetically associated with, but either proximal or distal to large-scale continental, A- to I-type magmatism, alkaline-carbonatite stocks, and crustal-scale fault zones and splays. The deposits are characterized by more than 20% iron oxides. Their lithological hosts and ages are non-diagnostic but their alteration zones are, with calcic-sodic regional alteration superimposed by focused potassic and iron oxide alterations. The deposits form at shallow to mid crustal levels in extensional, anorogenic or orogenic, continental settings such as intracratonic and intra-arc rifts, continental magmatic arcs and back-arc basins. Margins of Archean craton where arcs and successor arcs were developed appear to be particularly fertile. http://gsc.nrcan.gc.ca/mindep/synth_dep/iocg/index_e.php The 3810 Mt Olympic Dam deposit in Australia is the deposit that guides most mineral exploration worldwide (Hitzman et al., 1992; Western Mining Corporation, 2003). Currently known metallogenic IOCG districts occur in Precambrian shields worldwide as well as in Circum-Pacific regions (e.g., Carlon, 2000; Fourie, 2000; Porter, 2000, 2002a and papers therein; Strickland and Martyn, 2002; Gandhi, 2004c; Goff et al., 2004). The recognition of this deposit type was triggered by the 1975 discovery of the giant Olympic Dam deposit in Australia (Roberts and Hudson, 1983) followed by the discovery of Starra (1980), La Candelaria (1987), Osborne (1988), Ernest- Henry (1991), and Alemao (1996). The early discoveries served to define this group of deposits as the IOCG deposit type in the 1990s (Hitzman et al., 1992). source: Mineral Deposits of Canada Source: Iron Oxide Copper-Gold (+/-Ag,+/-Nb,+/-REE,+/-U) Deposits: A Canadian Perspective Louise Corriveau Geological Survey of Canada http://gsc.nrcan.gc.ca/mindep/synth_dep/iocg/index_e.php This appears to be a website publication only. 48
________________________________________________________________ IOCG PROPOSED MODELS Figure 62 - Schematic illustrations of flow paths and hydrothermal features for alternative models for IOCG deposits. Shading in arrows indicates predicted quartz precipitation (veining) for different paths in different quartz-saturated rocks which provides a useful first-order indication of path (cf,. Barton el al., 1997, Barton and Johnson,2000).. ________________________________________________________________ Page 49
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