Questcorp’s 12.8 km IP Survey Reveals Chargeability to 400 m Depth
Questcorp Mining’s 12.8 km IP survey at North Island Copper shows chargeability increasing from 150 m down to the 400 m survey limit, suggesting historical 1992 drilling only tested the outer shell. Integrated 3D inversion of new and legacy data refines a higher-confidence porphyry target for upcoming drill testing.
1. IP Survey Strengthens Depth Anomaly
Questcorp completed a 12.8 line-kilometre induced polarization survey over its Marisa Zone, detecting a pronounced chargeability anomaly intensifying from roughly 150 metres to the 400 metre survey limit, indicating potential mineralization at depth beyond previous drilling.
2. Historical vs. New Survey Parameters
The 2026 survey used 200 metre line spacing with parameters a=100 metres and n=9 for deeper penetration, compared to the 1992 survey’s a=50 metres and n=4 setup, which likely limited historical depth resolution.
3. Integration and 3D Modeling
Data from Peter E. Walcott & Associates was merged with Pacific Geophysical’s 1992 readings to produce a 3D inversion model, delivering a refined chargeability continuum and improved geometry of the suspected porphyry system.
4. Next Steps Toward Drill Testing
With the enhanced geophysical model and success of nearby North Isle Copper & Gold, Questcorp plans targeted drill campaigns to assess the full scale and grade of the deeper Marisa porphyry target.