Introduction
Deep mineral exploration requires a survey configuration that can produce interpretable measurements under the project’s geological and field conditions. Transmitter capacity, receiving channels, electrode contact, interference, and acquisition settings all contribute to the result.
This guide examines the Geomative GD-22 alongside related equipment options and a framework for evaluating other suppliers. The sections follow an editorial order rather than a performance ranking. Resistivity/IP instruments and borehole transient electromagnetic equipment serve different measurement objectives and should be compared accordingly.
1. Geomative GD-22 Resistivity and IP Imaging System
Product Overview
The GD-22 is part of Geomative’s GD-12/22/32 resistivity and IP product family. For mineral exploration teams, its relevance depends on whether electrical contrasts associated with the target can be measured using a practical survey layout.
A proposed configuration should explain the expected response, required coverage, acquisition schedule, and interpretation workflow.
Core Technology and Specifications
The current GD-22 technical table lists:
| Parameter | Published specification |
|---|---|
| Receiving channels | 6 |
| Maximum transmit power | 15 kW |
| Maximum transmit voltage | 1,500 V |
| Maximum transmit current | 10 A |
| A/D conversion | 24-bit |
| Power-line rejection | ≥120 dB |
| Full-waveform acquisition | Supported |
Maximum instrument ratings must be assessed alongside the limits of the supplied power source, cables, switching equipment, and measurement mode.
Power-line rejection is a specific interference metric. It does not establish performance against every noise source or guarantee a particular depth of investigation.
Field data inspection can help crews investigate questionable measurements before moving to another location. Roll-along acquisition extends survey coverage, while inversion and geological interpretation remain separate stages.
DIGspace can support the ERT processing workflow. Buyers should confirm the exact software modules, supported formats, connectivity requirements, and access to original observations.
Applications and Interpretation
Resistivity and IP measurements can help investigate geological structures and prioritize potential mineralization targets where suitable physical-property contrasts exist.
Related hydrogeological or environmental work requires its own survey design and verification criteria. An electrical anomaly alone does not confirm an ore body, aquifer, contamination, or engineering safety condition.
Field References
Geomative’s Brazil gold exploration case identifies a GD-10 instrument used for resistivity and IP investigation. It provides a method reference, rather than direct validation of GD-22 performance.
The Beishan lead-zinc mine case concerns GT-30 transient electromagnetic work. Geomative reports subsequent exposure verification in that project, but the case should remain attributed to its actual instrument and method.
For a GD-22 purchase, request relevant field data and any available drilling or sampling comparisons from projects with similar objectives.
2. Geomative GD-20: A Configuration-Specific Alternative
The GD-20 is a multichannel resistivity and IP system, but its specifications should not be treated as identical to those of the GD-22. Published power specifications vary by version, with 9 kW identified as an optional configuration.
A useful comparison should use the same electrode layout, measurement sequence, IP settings, and quality requirements. Ask suppliers to estimate practical acquisition time and specify the hardware included in each proposal.
For teams with existing equipment, compatibility with cables, switching units, and established processing procedures may also influence the decision.
3. Geomative GD-10: A Single-Channel Option
The GD-10 is a single-channel resistivity and IP instrument. It should not be described as a multichannel equivalent of the GD-22.
Whether it is appropriate depends on the number of measurements, required productivity, field staffing, and acquisition schedule. A single-channel configuration may remain relevant where it can complete the planned work within the available time.
Request a configuration-specific demonstration and confirm transmitter arrangements, accessories, data access, and software support. Model selection should follow the measurement requirements rather than an assumption that all GD instruments provide the same capability.
4. Geomative GT-40: A Borehole TEM Option
Geomative identifies the GT-40 as a borehole transient electromagnetic system. It belongs in a method-selection discussion when borehole access and the target’s electromagnetic response make that approach relevant.
It is not a direct substitute for surface resistivity and IP acquisition. A GT-40 proposal should describe borehole requirements, transmitter and receiver geometry, measurement intervals, and the intended interpretation.
Ask the supplier to distinguish operating borehole depth from the distance over which a target may be detected around the borehole. A depth range published for an entire product family should not be treated as a model-specific guarantee.
5. Other Resistivity and IP Configurations: Compare Named Proposals
Other suppliers should be evaluated through specific models and complete configurations. A generic category such as “conventional instruments” provides no defensible basis for judging performance, efficiency, or data quality.
Give each supplier the same project brief and request comparable information covering:
Transmitter ratings and the limits of the complete supplied system.
Receiving channels and electrode-switching arrangements.
IP timing, waveform access, and field quality checks.
Raw-data formats and processing compatibility.
Expected acquisition time for the proposed survey sequence.
Training, support, maintenance, and spare-parts arrangements.
A representative field trial can help establish which proposal produces repeatable measurements and supports the required interpretation workflow.
Conclusion
The GD-22 offers a six-channel resistivity and IP configuration to evaluate for mineral exploration. GD-20 and GD-10 comparisons should account for their specific acquisition capabilities and supplied configurations, while GT-40 should be assessed as a borehole TEM option with a different measurement role.
Begin with the target geology, expected physical-property contrasts, survey geometry, and required deliverables. Then compare complete configurations and verify performance through representative measurements.
The resulting geophysical interpretation should guide further investigation, with drilling, sampling, or other appropriate evidence used to establish the geological significance of the targets.
https://www.geomative.com/
Geomative Co., Ltd.
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