Ground IP / Resistivity
Applications in Mineral Exploration
- Identifies gold-bearing veins with sulphides.
- Maps disseminated sulphides and stringers surrounding VMS.
- Discriminates between barren and mineralized EM conductors.
- Identifies sphalerite, discontinuous banded mineralization, non-conductive sulphides.
- Maps alteration zone and structural features controlling mineral deposition (porphyry cooper system).
- Maps clay minerals and/or magnetic associated with kimberlitic rocks.
- Resistivity mapping for alteration, basin depth.
- Select the best electrode array for reconnaissance, depth penetration or detail target mapping.
Equipment and Software
| Transmitter | Tx-III from GDD Instruments (up to 7.8 kW) |
| Receiver | Elrec-Pro from IRIS Instruments (10 input channels and 20 decay curve sampling windows) |
| In-field QC | Processing and plotting are performed using our proprietary Refusilo® software. |
| Analysis | Image2D®, Image3D®, Res2Dinv, Res3Dinv, DC IP 3D |
Configuration and Survey Parameters
| Ground | Ipower3D® | Dipole-dipole, pole-dipole, pole-pole, gradient | Spectral IP (optional) |
|---|---|---|---|
| Overcome conductive overburden masking effects | X | ||
| 3D surface configurations for increased depth penetration | X | X | |
| Time-domain for best-in-the-field quality control | X | X | |
| Electrode spacing and configuration selected by numerical modelling to ensure the success of the IP program | X | X | |
| Identification of resistive, conductive and polarizable features | X | X | |
| Differentiate source of anomaly –sulphides/oxides/clay minerals | X | ||
| Discriminate between mineralization and cultural features - railroads, pipelines, power lines, fences, etc. | X |
Limitations: Investigation depth may exceed 400 metres for large porphyry systems (since the response is volume dependant) but may be restricted to ~ 50 metres for thin non-conductive, sheet-like structures (veins). Investigation depth is a function of target body size (larger bodies can be found at greater depths).
Supplied Products
- Apparent resistivity and IP pseudo-sections along with Image2D® inverted true-depth sections.
- Colour contoured plan maps of resistivity, IP, time constant and metal factor plotted at various depths.
- Plan map of stacked pseudo-sections or stacked true-depth image2D® sections.
- Complete interpretation report including DDH target diagrams along true-depth sections.
- Inversion available with: Image2D®, Image3D®, Res2Dinv, Res3Dinv, or DC IP 3D.
IPower3D®:
- 3D reconstructed chargeability and resistivity database.
- Colour plan views and cross-sections of the recovered resistivity and chargeability.
- 3D videos of the resistivity and chargeability main features.
– deep TDEM
- Deep TEM