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Proterozoic massive sulphide deposits occur in a wide variety of geologic settings that range from those composed of volcanic flow rocks to those composed of clastic sedimentary rocks. Evidence of volcanism, contemporaneous with the mineralizing event, can be found in the host rocks to most of the deposits, including a number of those occurring in thick sedimentary sequences. Proterozoic massive sulphide deposits in volcanic terranes have metal ratios similar to those of Archean, Phanerozoic, and younger deposits when compared to deposits in similar geologic settings. Deposits found in sedimentary terranes are more lead-rich and copper-poor than those in volcanic terranes....

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