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Summary of ~5 km scale geophysical signatures (relative response) Stage 1 dior monz range range
Summary • For alkalic porphyries, magnetic (oxidized) rocks are interesting, but magnetite rich intrusives/alteration not as common in calc-alkalic settings • Later phyllic alteration can destroy primary igneous and secondary hydrothermal magnetite in host rocks in both alkalic and calc-alkalic settings • Conductivity information can be very useful for detecting structures; Intrusive bodies are usually resistive as a result of coherency • IP surveys are very effective in detecting peripheral pyrite halos • Scale important! At 5 km scale, magnetic and resistivity signatures likely relate to rock type and structure, not mineralization; IP most effective • There is no unifying geophysical model for porphyries - need to understand typical background rocks and alteration, general structural orientations – important for applying outside of <strong>BC</strong>! – Host rocks (magnetic/non; brecciated/coherent) – Depth of formation/erosion (related to alteration mineralogy/halos) – Metal distribution (connected, disseminated Zoning)
Page 1 and 2: Mount Milligan BC porphyry deposits
Page 3 and 4: Relating geology to geophysics thro
Page 5 and 6: Thinking geology while interrogatin
Page 7 and 8: Mount Milligan local geology Mount
Page 9 and 10: Physical property variations relate
Page 11 and 12: Lorraine Lorraine Mount Milligan Mo
Page 13 and 14: Lorraine magnetics and chargeabilit
Page 15 and 16: Chargeability and resistivity NW Lo
Page 17 and 18: Mount Polley local geology and alte
Page 19 and 20: Local high mag zones
Page 21 and 22: Lorraine Mount Milligan Mouse Mount
Page 23 and 24: Local scale magnetics and chargeabi
Page 25 and 26: Susceptibility not related directly
Page 27 and 28: Lorraine Mount Milligan Gibraltar M
Page 29 and 30: Induced polarization response (rela
Page 31: IP/Resistivity in non-mineralized v

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