During the early months of my IIG porphyry copper project in Chile, I had a revelatory moment on an evening LAN Chile flight from Arica south to Santiago (Fig. 1.8). From a window seat on the left side of the Sud Aviation Caravelle, I could see the line of Quaternary stratovolcanoes along the Chile-Bolivia border illuminated by the setting sun (Fig. 4.1). In the variably eroded centres of the stratocones, large alteration zones were clearly evident (Fig. 4.2). Having already realised that volcanoes and porphyry copper deposits can both form above subduction zones, I was exhilarated...

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