Australia Zinc — Bluebush
A drill-controlled test of ADR energy, frequency and dielectric responses against a deep pyrite–sphalerite sulphide interval in Australia.
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At Bluebush, scan H1 BB008 was analysed alongside parallel drill hole BBDD054. The drill data records a major pyrite–sphalerite sulphide interval at approximately 600–700 m.
ADR processing examined dielectric response, returned energy and frequency correlation. A strong energy response at about 675 m approximately correlates with the major sulphide interval. The 5–10 MHz response also contains a pronounced anomaly associated with the mineralised zone.
Bluebush became the training case for the wider study: its drill-controlled relationships were used to define selection criteria that could then be challenged at unrelated sulphide prospects.
Multiple measurements. One geological question.
Energy response
A pronounced returned-energy feature occurs around 675 m, within the depth range of the main sulphide-rich drill interval.
Frequency response
The 5–10 MHz correlation shows a strong response associated with the mineralised interval; individual frequency bands were investigated to refine the fingerprint.
Dielectric evidence
The study reports higher dielectric response corresponding with sulphide layers, while recognising that water, clays and hydrous minerals can also produce high dielectric values.
The strongest ADR responses coincide with the principal drill-recorded sulphide zone.
The Bluebush comparison is useful because the ADR logs and drill information can be read on the same depth scale. The study describes a reasonable correlation between energy return and sulphide location and treats energy as one line of evidence — strongest when combined with frequency and other ADR outputs rather than used alone.
This is a calibrated, drill-controlled case study. It supports sulphide-zone discrimination, not direct zinc grade prediction. The study also notes potential depth errors with increasing depth and explicitly favours multiple lines of ADR evidence over a single indicator.
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Every geological setting is different. This case study demonstrates evidence from a particular project; it does not guarantee the same result elsewhere.
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