GEOLOGIST'S CONCERN:

GEOPHYSICIST THINKS IN TERMS OF:

APPLICABLE GEOPHYSICAL METHOD:

permeability, porosity

• resistivity • density

Resistivity, Seismic, Gravity

foliation, bedding

• anisotropy

Resistivity, Seismic, CSAMT, IP, CR

faults and fractures

• abrupt changes in resistivity and density

Resistivity, Seismic, Gravity, Magnetics, CSAMT, TEM, FEM

Metallic luster minerals

disseminated

• 0.2 to 5% minerals • weak conductor • low resistivity • moderate to strong IP

Resistivity, IP, CR, SP, Magnetics, Seismic

massive

• greater than 10% mineralization • strong conductor • very low resistivity • moderate to weak IP

Resistivity, CSAMT, TEM, FEM, Magnetics, Seismic, SP IP, CR

alteration

• high or low resistivity depending upon alteration type • weak magnetics • moderate to weak IP

Resistivity, IP, CR (CLAYS), Magnetics, CSAMT, TEM, FEM, Radiometric, SP

silicification (dike-like) features)

• large resistivity contrasts • potassium

Resistivity, CSAMT, Seismic, Radiometric

hydrothermal alteration

• low resistivity • weak magnetics • potassium

Resistivity, Magnetics, Radiometric, Seismic, IP, CR

weathering

• low over high resistivity • weak magnetics

Resistivity, CSAMT TEM, FEM, Seismic, Magnetics, (IP), CR, Radiometric

buried stream channels

• subtle resistivity changes • magnetic sands • density changes

Resistivity, NanoTEM, Magnetics, Seismic, (TEM, CSAMT)

leaking dams and ponds

• resistivity changes • streaming potentials

Resistivity, CSAMT, SP, NanoTEM, TEM, FEM