Miramar Resources Limited (ASX:M2R, “Miramar” or “the Company”) is pleased to advise that reprocessing of geophysical data has upgraded the 8-Mile target within the Gidji JV Project (“Gidji” or “the Project”), 15 kilometres north of Kalgoorlie, WA.
- Reprocessing of geophysical data increases potential for northern extension to NST’s 313koz “8 Mile Dam” Deposit at Miramar’s 8-Mile target
Miramar’s 8-Mile target is located at the southern boundary of the Gidji JV Project and abuts Northern Star Resources Limited’s 313koz “8 Mile Dam” gold deposit (Figure 1).
The reprocessed data shows a well-defined gravity and Induced Polarisation (IP) anomaly north of the 313koz “8 Mile Dam” Resource, which appears to have been offset by a SW-NE trending fault and underlies numerous significant aircore end of hole (EOH) results.
Miramar’s Executive Chairman, Mr Allan Kelly, said the combination of the multiple coincident datasets increased the potential for an extension to the 8 Mile Dam deposit within the Company’s Gidji JV Project.
“We have multiple high-grade end of hole aircore gold results overlying an IP and gravity anomaly which looks very similar to the 8 Mile Dam gold deposit immediately south of our tenement boundary,” he said.
“The geophysical data suggests that the deposit may extend into our ground but has been offset approximately 400 metres to the northeast by a fault,” he added.
“The 8-Mile offset target is within reach of RC drilling and, unlike the targets further north, there is no paleochannel covering the basement geology,” he said.
Figure 1. Google Earth image showing the 8 Mile Dam Deposit in relation to the Gidji JV Project.
According to publicly available information, the 8 Mile Dam Project contains 7Mt @ 1.4g/t Au for 313,977 contained ounces1 with primary mineralisation hosted in a steep southwest-dipping mafic unit within volcanoclastic sediments of the Black Flag Beds. Figure 2 shows a cross section through the deposit approximately 40m south of the Gidji JV tenement boundary.
In March-April 2021, Miramar completed the second phase of aircore drilling across the Gidji JV Project, including several holes at the 8-Mile target. Significant results along strike from 8 Mile Dam included 1m @ 1.17g/t (GJAC092), 3m @ 1.22g/t Au (GJAC097) and 1m @ 1.78g/t Au (GJAC099). Other holes also intersected anomalous gold including at the end of hole (ASX Release 12 April 2021 and 29 June 2021).
In May 2021, Miramar completed three diamond drill holes targeting a strike extension to the 8 Mile Dam deposit. All three diamond holes intersected the same geological package as 8 Mile Dam but intersected only minor gold mineralisation within the mafic unit (ASX Release 11 May 2021).
At the same time, Miramar completed an orientation IP survey comprising one line of Dipole-Dipole IP just north of the tenement boundary. The survey highlighted a chargeability anomaly close to the projected position of the 8 Mile Dam deposit but underneath and south of Miramar’s diamond holes (Figure 3).
Given the interpreted depth of the IP anomaly, the limited potential strike length north of the tenement boundary and the disappointing diamond drilling results, the target was downgraded with the Company focussing on the Marylebone target where numerous high-grade aircore gold results were being received.
The Company subsequently received assay results from EOH samples from the second phase of aircore drilling. Several holes at 8-Mile returned significant fire assay gold results (see Table 1). The best EOH results were offset to the northeast of both the diamond drilling and the IP anomaly and did not correlate well with the original aqua-regia assay results.
In early 2022, following the takeover of KCGM, Northern Star Resources Limited commenced diamond drilling at the 8 Mile Dam deposit, immediately south of the tenement boundary. Miramar staff observed that the new drilling was oriented towards the southwest, in the opposite direction to most of the drilling conducted by KCGM, implying that Northern Star were targeting a different geological model.
To date, Northern Star have not announced any results from that drilling.
In May 2022, Miramar completed a follow-up IP survey comprising a central transmitter line and two receiver lines spaced approximately 350m apart and extending for 1600m.
This Pole-Dipole IP survey highlighted a NW-trending chargeability anomaly offset approximately 400m to the northeast of the diamond holes and the orientation IP anomaly and located underneath the significant EOH aircore results (Figure 4). The new IP anomaly has a strike length of at least 250m, is approximately 400m below surface and remains open to the northwest.
The Company also reprocessed open file gravity data which highlights NW-trending gravity anomalies underlying both the 8 Mile Dam deposit and Miramar’s 8-Mile target where the gravity anomaly is also offset approximately 400 metres to the northeast by a SW-NE-trending fault (Figure 5).
Miramar is reviewing options for testing the offset 8-Mile target including aircore drilling and/or RC drilling. The Company has Programme of Work (POW) approval for drilling at this target.
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Figure 1. Google Earth image showing the 8 Mile Dam Deposit in relation to the Gidji JV Project.
