Electrical methods case studies
Electrical methods case studies
Pine point mineralization, Northwest Territories
Strata-bound sulphide deposit (lead-zinc-silver in a limestone host rock)
Background effects in limestone are very low
Resistivity pseudo-section relatively featureless
FE and MFE sections show persistent anomaly, even at very large spacing.
Detection of clay lens in an aquiferMap of PFE detects a clay-rich lens in a sandy gravel
Clay reduces the fluid permeability
Hence the IP survey aided in the assessment of the potential of the aquifer as a reservoir
Disseminated porphyry copper
Relatively featureless resistivity, discovery of mineralization made on the basis of the MF pseudo-section.
Discovery is ore-grade, in spite of low grade due to copper and molybdenum.
Disseminated sulphide
Deeper deposits inferred from psuedo-section: note large spacing required to detect MF anomaly
Gortdrum copper-silver, IrelandLimited data (one profile only, no pseudo-section)
Chargeability anomaly well defined, centered over ore body.
Lornex copper porphyry, British Columbia
Resistivity shows only a mild increase to the east – probably due to thinning of conductive overburden
Short spacing IP shows the mineralization, relatively low grade at the east.
Long spacing IP indicates mineralization continues at depth to the west.
Krain sulfide deposit, British Columbia
Model study of “inversion”
Psuedo section Inversion result, or “real” section
Model study of “inversion”
Psuedo section Inversion result, or “real” section
Example of “inversion”, Century deposit, Australia
Pseudo-section
Inversion result, with interpretation
Predicted IP data
Dam leakage, Mexico