Blind-testing ADR in a world-class nickel mining environment
A historical ADR programme at Glencore’s Raglan Mine used known geology to develop interpretation criteria before applying them to blind Virtual Borehole locations — testing whether subsurface intervals of geological interest could be identified before further drilling.
A Tier 1 mining context for technology validation. Raglan Mine is part of Glencore, one of the world’s largest diversified natural-resource companies. The historical ADR programme therefore provided an opportunity to test the technology in a demanding, operational mining environment rather than a controlled demonstration.
Detecting discrete nickel-sulphide mineralisation at depth
An Atomic Dielectric Resonance (ADR) survey was undertaken at Raglan Mine in northern Québec during 2015. The published project’s stated purpose was to investigate whether ADR could detect nickel-sulphide lenses within the Raglan ultramafic complex.
The study did not rely solely on interpretation after the fact. ADR measurements were first compared with known geological and mineralisation information at training locations. Responses identified in those datasets were then used to interpret blind locations where detailed geology was withheld from the ADR interpretation team.
For VEXRAD, this historical project is especially valuable because of that experimental structure: learn from known geology → predict at an unknown location → compare the prediction with independent geological knowledge.
Can non-invasive surface measurements identify subsurface intervals worthy of greater geological attention before committing to additional drilling?
Train → Blind Test → Compare → Refine
Known geology
ADR datasets from training locations were compared with known drilling and mineralisation information.
Response patterns
Harmonics, dielectric response, energy-related parameters and frequency correlations were examined for repeatable indicators.
Blind locations
The interpretation method was applied to Virtual Borehole locations without disclosure of the detailed target geology.
Evidence comparison
Predicted areas of interest were assessed against geological feedback and used to refine the interpretation approach.
Discrete depth intervals identified for further geological attention
The published report records multiple areas of interest at the blind-test locations. Importantly, not every response was treated as an orebody: the interpretations considered geological alternatives, and one location produced a weaker response considered potentially consistent with no orebody being present.
Two principal areas of interest
The report interpreted these intervals as potentially representing gabbro or mineral bodies based on combined ADR parameters and feedback developed from the training data.
Three reported areas of interest
The final report identified three intervals using harmonics, dielectric and correlation information together with interpretation rules developed from earlier locations.
A weaker response matters too
THURS1 produced a smaller range in the harmonic data than SAT1. The published interpretation explicitly recognised that this could indicate that no orebody was present in the Virtual Borehole.
Useful exploration intelligence should help distinguish where to investigate further from where priority may be lower.
SUN3 interpreted depth intervals · Surface to 700 m
Multiple ADR parameters, interpreted together
Good correlation with geology
Client feedback recorded in the published report for the 1–5 MHz correlation analysis at blind-test location SUN3.
Technology validation in a demanding real-world setting
Raglan Mine is a major nickel operation within Glencore’s global natural-resources portfolio. Working in this environment brought the ADR method into contact with experienced mine geologists, established geological information and the practical requirements of mineral exploration.
The public report was prepared on behalf of Raglan Mine, a Glencore company, and includes a Certificate of Reviewer from Raglan Mine Senior Geophysicist Daryl Ball, who stated that he worked directly with the data-collection crew and reviewed the report.
“Glencore and the Raglan Mine team were an excellent client to work with. The opportunity to test ADR alongside an experienced Tier 1 mining organisation, using real geological challenges and blind locations, made this a particularly valuable project in the technology’s development.”
Prediction is more valuable when it can be tested
What the evidence supports
- ADR measurements were collected at an operating nickel mine in northern Québec.
- Known geological information was used to establish interpretation parameters.
- Those parameters were subsequently applied to blind-test locations.
- The published report identifies discrete subsurface intervals for geological attention at SUN3 and SAT1.
- THURS1 provided a weaker response, demonstrating the value of lower-confidence or negative evidence.
What the evidence does not claim
- ADR is not a replacement for drilling or laboratory assay.
- An ADR anomaly should not automatically be interpreted as an economic orebody.
- The SUN3 and SAT1 interpretations allowed for geological alternatives including gabbro.
- Exploration decisions should integrate ADR with geology, geochemistry, conventional geophysics and drilling.
Publicly archived evidence
The public report is titled “Geophysical Survey Report – ADR Survey – Zone 5-8 and Zone 13-14 – Raglan Mine Quebec” and is dated 12 April 2017.
It was prepared on behalf of Raglan Mine, a Glencore Company. The report includes a Certificate of Reviewer signed by Raglan Mine Senior Geophysicist Daryl Ball.
The document is publicly available through the Government of Québec geological information system as GM 70321.
From historical validation to better pre-drill decisions
This historical ADR study forms part of the technical evidence base now presented by VEXRAD.
The relevance today is not simply that subsurface responses were measured at depth. The more important feature is the experimental structure: known geology was used to develop interpretation rules, those rules were applied to blind locations, and the resulting predictions could then be compared against geological knowledge.
That principle sits at the centre of VEXRAD’s approach to Virtual Boreholes and pre-drill subsurface intelligence: improve target confidence before committing the next unit of exploration capital.
What could a Virtual Borehole add to your exploration model?
Give VEXRAD one target, your existing geological information and the decision you are trying to make. We can assess whether ADR is technically appropriate before you commit to a larger programme.
VIEW ORIGINAL GOVERNMENT OF QUÉBEC REPORT →
What could ADR show at your target?
Every geological setting is different. This case study demonstrates evidence from a particular project; it does not guarantee the same result elsewhere.
If you have a target, existing geoscience or a proposed drill location, start with a free VEXRAD Project Fit Check. We will review whether ADR appears technically relevant before recommending further work.
No commitment to a field programme is required to submit a Project Fit Check.