THE DRILL SERGEANT: Orion Gold (ASX: ORN) has been encouraged by the receipt of promising initial results from the first lines of a geophysical survey being undertaken at the Aurora Flats prospect, located within the company’s 100 per cent-owned Connors Arc epithermal project in Central Queensland.
The first two lines of the high resolution IP/resistivity survey have been completed including one over historical drill hole AFRC001, which intersected 1m at 1.14 grams per tonne gold and 77ppm silver.
Although the data is still being processed, Orion has observed resistive features in locations predicted by the company’s mapping of epithermal vein sets.
“Given that quartz veins are resistive in nature it is interpreted that the broader resistive features indicate substantial veining at depth,” Orion Gold explained in its ASX announcement.
“The company awaits final processing to refine the modelling of the resistivity anomalies and allow for drill siting.”
Chargeability (top) and resistivity (bottom) pseudosections from line 3A. Source: Company announcement
Results from the survey indicate Line 3A has detected two chargeability anomalies – one down dip of mapped quartz veining and the AFRC001 intersection and another to the east, vertically below mapped epithermal quartz veining and stockworks.
The chargeability anomalies appear to be strongest at depths of approximately 250m to 300m below surface, which Orion said in epithermal systems, represents the top of the ‘critical
Zone’ for metals deposition.
So far, the company has identified three discrete resistivity anomalies based on the preliminary inversion data – one correlates with mapped quartz veining in the centre of the IP line and the other two appear to correlate with chargeability anomalies.
Line 2 detected a broad resistive zone below the corridor of mapped epithermal veins, which the company has interpreted to represent the continuation of these veins at depth.
“A strong chargeability anomaly lies below this resistive zone and further processing will refine the magnitude and location of this anomaly,” Orion said.
Orion has also pointed out a strong resistivity anomaly in the eastern part of the section to be of interest as it has a correlating moderate level chargeability anomaly that appears strongest at its western margin.
The company considers this anomaly requires further work to interpret in a geological context given it occurs below a rhyolite cap which, would obscure any surface expression.
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