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Copper-molybdenum content Magnetite content Deposit morphology Depth of emplacement Deposit tonnage Associated igneous rocks Characteristics of porphyry copper-gold deposits Characteristics of porphyry copper-gold-molybdenum deposits Characteristics of porphyry copper-molybdenum deposits Geochemical interpretation References FIGURES 1. Fifty-five porphyry copper deposits plotted according to their copper, gold, and molybdenum content 2. Triangular plot of silver grade of porphyry copper deposits 3. Triangular plot of magnetite content of porphyry copper deposits 4. Plot of magnetite content vs. gold grade of 26 porphyry copper deposits 5. Triangular plot of porphyry copper deposits according to their morphologic class 6. Triangular plot of depth of emplacement of porphyry copper deposits. 7. Plot of estimated depth of emplacement vs. gold grade of 18 porphyry copper deposits 8. Triangular plot of tonnage class of porphyry copper deposits 9. Triangular plot of type of intrusive rock in porphyry copper deposits 10. Cartoon cross section of a typical porphyry copper-gold deposit 11. Cartoon cross section at a typical porphyry copper-gold-molybdenum deposit 12. Cartoon cross section at a typical porphyry copper-molybdenum deposit 1.
Cox et al. (Fri,) studied this question.