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Introduction: Addressing the Challenges of Deep Mineral Exploration

Deep mineral exploration requires measurements that can help distinguish geological targets from their surroundings. Difficult electrode contact, electrical interference, terrain, and limited access can complicate acquisition and interpretation.

Geomative’s GD-22 resistivity and induced polarization system provides an option for investigating electrical contrasts associated with structures and potential mineralization. Its suitability depends on the target’s physical properties, survey design, and field conditions.

The resulting interpretation can help prioritize exploration targets. Confirmation of mineralization and assessment of a deposit require drilling, sampling, and other appropriate geological evidence.

GD-22: Positioning and Target Scenarios

The GD-22 is a six-channel resistivity and IP acquisition system within Geomative’s GD range.

For a deep-target investigation, the proposed configuration should connect the expected response with the electrode layout, transmitter arrangement, measurement sequence, and processing requirements.

Before selecting equipment, teams should establish whether the target is likely to produce a measurable contrast relative to its host rocks. Available geological information, physical-property measurements, and a representative field trial can support this assessment.

Technical Specifications That Support Survey Planning

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, selectable 50/60 Hz
Full-waveform acquisition	Supported

These are instrument specifications. Actual operation also depends on the power supply, electrical load, cables, switching equipment, and measurement mode.

Transmitter capacity can help establish usable measurements under suitable conditions, but it does not independently determine exploration depth. Target size, electrical contrast, survey geometry, overburden, and noise also matter.

Power-line rejection describes a particular interference characteristic. Field testing should examine repeatability and usable signal levels with the intended acquisition settings.

Practical Value for Mineral Deposit Localization

Three areas deserve attention when evaluating GD-22 for an exploration program.

Transmitter configuration. Confirm that the complete system can deliver the required measurements within the operating limits of its components. Maximum power should not be treated as a guaranteed field output or investigation depth.

Field quality review. Inspecting observations and available waveforms can help crews investigate questionable measurements before moving on. Repeat observations remain part of quality control. Roll-along acquisition serves a separate purpose by extending survey coverage.

Deployment flexibility. Surface, tunnel, borehole, and water-based work require appropriate layouts and accessories. Confirm what must be added or changed for each planned deployment.

A representative demonstration should assess these elements together, including practical acquisition time and data transfer.

Industry Adaptation: Beyond Mineral Exploration

Related electrical survey applications include groundwater investigation, engineering studies, seepage assessment, environmental investigation, and archaeology.

Each application requires its own survey design and verification criteria. An electrical anomaly does not independently confirm an aquifer, leakage pathway, void, contamination, or structural defect.

Where long-term monitoring is required, acquisition schedules, maintenance, data review, and procedures for investigating changes should be specified separately.

Mineral Exploration References

Geomative’s published Beishan lead-zinc mine case concerns GT-30 transient electromagnetic work. The company reports subsequent exposure verification of interpreted targets. This is a reference for that method and project, rather than direct validation of GD-22.

The Brazil gold exploration case identifies a GD-10 instrument used for resistivity and IP investigation of potential mineralization targets. It likewise should remain attributed to its actual equipment and survey conditions.

For a new GD-22 project, request examples with comparable geology and objectives, together with available raw observations and follow-up evidence. A method’s use at one site does not establish performance at another.

Supporting the Workflow with DIGspace

DIGspace provides desktop analysis, web collaboration, and spatial presentation capabilities. Its ERT workflow can support data review, inversion, and interpretation.

Buyers should confirm the modules available for the proposed GD-22 configuration, particularly where IP processing is required. Three-dimensional visualization, three-dimensional inversion, and joint inversion should be identified separately.

Test representative files through acquisition, import, processing, and export. Check coordinates, units, electrode definitions, acquisition settings, and quality information. Preserve original observations and processing parameters so results can be reviewed or reproduced.

Remote projects should also establish connectivity requirements and offline working arrangements.

Technical Support and Purchasing Considerations

A useful GD-22 quotation should describe the target depth range, approximate dimensions, expected physical-property contrasts, survey layout, and field constraints.

Ask for an itemized configuration covering the main instrument, power source, electrodes, cables, switching equipment, and software. Confirm training, repair arrangements, spare-parts availability, and assistance with acquisition or processing questions.

Evaluate the proposal through representative measurements and a complete workflow demonstration. This provides a practical basis for deciding how GD-22 can support the exploration program and its next verification steps.

https://www.geomative.com/
Geomative Co., Ltd.

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