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Extremely intimate space-time associations between caic-alkaline (shoshonitic) lamprophyres and mesothermal gold deposits are now confirmed worldwide and from Archean to Tertiary times. They include the late Archean gold deposits of the Superior province (Canada) and the Norseman-Wiluna belt (Western Australia), which hosts the world’s most golden square mile (Kalgoorlie) and almost certainly one of the richest gold deposits outside South Africa, (Porgera, Papua New Guinea). In an increasing number of areas, lamprophyres are found to be the only igneous rocks emplaced at the same time as the gold, and economic status has been found to correlate quantitatively with the...

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