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Understanding the Challenge of Mineral Exploration in Brazil

For exploration teams evaluating the Geomative GD-22 resistivity system for a project in Brazil, equipment selection starts with the geological target and field conditions. Target depth, electrical contrasts, electrode contact, interference, and access all influence whether a survey can produce useful measurements.

Survey planning also needs to address the connection between acquisition and interpretation. Incomplete coordinates, missing acquisition records, or delayed quality checks can complicate processing and require additional fieldwork.

Geomative supplies geophysical instruments and subsurface data software. The GD-22 offers a configuration to consider for resistivity and induced polarization investigations, subject to a project-specific assessment.

GD-22 Multi-channel Resistivity and IP Imaging System

The GD-22 forms part of Geomative’s GD-12/22/32 product family. It combines six receiving channels with resistivity and IP acquisition capabilities.

For mineral exploration, the practical objective is to investigate electrical contrasts that may help delineate geological structures or prioritize potential mineralization targets. The relevance of those measurements depends on the target’s physical properties and the surrounding geology.

A GD-22 proposal should therefore explain what response is expected, how the survey will measure it, and how the interpretation will be tested.

Technical Highlights

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 specifications provide a starting point for technical comparison. Maximum transmitter ratings must be considered alongside the operating limits of the proposed power supply, cables, switching equipment, and measurement mode.

Power-line rejection describes a specific interference characteristic. It does not guarantee performance against every noise source. Likewise, transmitter power and digital conversion specifications alone do not establish achievable depth or geological resolution.

A representative field trial should assess repeatability and usable signal levels under the intended acquisition settings.

Modular Hardware and Field Quality Control

Deployment requirements should be defined before selecting accessories. Surface profiles, borehole measurements, and water-based surveys require different arrangements, and compatibility should be confirmed for the complete proposed system.

Field quality control should include checks on electrode contact, measurement consistency, acquisition settings, and position records. Questionable observations can then be investigated while the crew remains on site.

Roll-along acquisition helps extend coverage, while data inspection and processing serve separate purposes. A demonstration should show how the proposed workflow identifies problematic measurements and records any corrective action.

For gold or polymetallic exploration, repeatable electrical anomalies can help prioritize follow-up work. Their geological meaning still needs to be assessed against mapping, sampling, drilling, and other relevant evidence.

Brazil Gold Exploration: A Method Reference

Geomative publishes a gold exploration case from Pará, Brazil, involving resistivity and IP work with a GD-10 instrument. The case provides a regional reference for the use of electrical methods in investigating potential mineralization targets.

It should not be presented as a GD-22 deployment or as proof of GD-22 performance at another Brazilian site. Similarity in method does not establish equivalence in equipment configuration, geology, or field results.

For a new project, request examples with comparable target characteristics and survey conditions. Where available, examine how interpreted anomalies relate to subsequent drilling or sampling. Geophysical results can guide verification, but do not independently confirm a mineral resource.

Complementary Digital Workflow: DIGspace Geoscience Platform

The value of a survey depends partly on how readily its measurements can be checked, processed, and interpreted. DIGspace provides an ERT workflow that includes data review and online inversion, supporting the transition from observations to resistivity models.

Before including software in a GD-22 purchase, confirm the functions available in the proposed package. Relevant questions include supported data formats, IP processing requirements, topographic inputs, model exports, and access to original measurements.

For projects using several datasets, distinguish spatial visualization from combined interpretation or joint inversion. Displaying geological and geophysical information together can support review, but does not automatically mean that one dataset constrains the inversion of another.

Teams working at remote sites should also confirm connectivity requirements, offline arrangements, and how data will move between field staff and interpreters.

Evaluating Geomative for Mineral Exploration in Brazil

The GD-22 and DIGspace can be evaluated together as components of an acquisition and interpretation workflow. Their suitability should be demonstrated against the project’s requirements.

A useful quotation request should include the target depth range, expected geology, planned electrode layout, required resistivity and IP measurements, terrain, and known interference sources. Ask for an itemized configuration covering hardware, accessories, software, training, and support.

For a project in Brazil, confirm delivery arrangements, technical support availability, service location, and spare-parts lead times. These operational details should be established directly rather than inferred from an international customer list or a published case study.

The next step is to submit a project brief and request a GD-22 configuration supported by a representative acquisition and processing demonstration. This creates a practical basis for assessing whether the system can deliver the measurements needed to guide the exploration program.

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

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