お知らせ • Mar 04
Westar Resources Limited Announces the Results of the Airborne XciteTM Electromagnetic Survey and Interpretations Completed for the Opaline Well Project in the Pilbara of Western Australia
Westar Resources Limited announced the results of the airborne XciteTM electromagnetic survey (AEM) and interpretations completed for the Opaline Well project in the Pilbara of Western Australia. The AEM program was the next systematic step in identifying priority drill targets after a successful field reconnaissance and rock-chip sampling program conducted earlier in CY2021. The AEM survey, using NRG's ExciteTM airborne electromagnetic system covered the entire project tenure, an area of approximately 70km2 and 372-line km on 200m line spacing. The survey was intended to rapidly identify discrete conductors representing potential massive sulphide drill targets. Follow up ground truthing is currently being planned. Airborne Electo-Magnetic Survey (AEM) Results: Westar undertook a high resolution XciteTM electromagnetic and magnetic survey in October 2021. The processed data was provided to specialist consultants, Newexco Pty Ltd. (Newexco) for interpretation and modelling. The main area of interest is anomaly 101, which is a high-amplitude, mid to late time EM anomaly and appears as discrete, steeply dipping, relatively conductive body at depth. A series of early-time anomalies (201, 202 and 203) appear spatially related. Anomalies 200, 101, 102 and 103 are likely attributable to stratigraphic conductors within the Cleaverville Formation, such as thin BIF units along a faulted contact. Priority Prospect - Anomalies 101, 201, 202 and 203: The most interesting and highest priority anomaly identified in the AEM survey is anomaly 101, being of relatively high-amplitude and spanning several flight lines. Anomaly 101 is a mid to late time EM anomaly and appears as a classical, stand-alone, prominent, mid to late time, twin peak EM anomaly, characteristic of a steeply dipping, relatively conductive body at depth. Anomaly 101 is the late-time part of the broader 101, 201, 202 and 203 anomalies, which overlap and overlie the late time 101 anomaly. Additional ASTER, SENTINAL 2 and radiometric data indicate anomalies 201, 202 and 203 are conceivably a weathering product from the deeper, underlying more conductive body associated with Anomaly 101, however, the possibility remains these may potentially be related to surficial cover and ground truthing is required. Anomaly 101 has been modelled as two steeply dipping plates which produce excellent late-time fit. The offset between the plates are likely an artefact of the modelling and it is probable the causative body is a more complex, single plate feature, thinning and deepening to the north. The EM anomaly extends for approximately 800m in strike length, with depth to centre top of the plate approximately 40m below surface in the south and 75m in the north, dipping steeply to the east. Anomaly 200, 102, 103 and 104: Anomaly 200 is the highest amplitude EM anomaly in the survey area, spanning nine flight lines (approximately 2km) and extends off the edge of the survey on both the north and south edges. The anomaly appears as a broad, irregular asymmetric single peak anomaly with a very large early time anomaly, grading to a low, late time anomaly and has been modelled as a series of shallow westerly dipping plates. It is possible the early time, surficial conductor may be a weathering product from the deeper conductive body, most likely a stratigraphic unit such as BIF. Anomalies 102, 103 and 104 trend north-south along the western contact of the Euro Basalt (a mixture of basalt, komatiitic basalt, sills and volcaniclastic rocks) and the Cleaverville Formation (BIF, chert, sediments and volcaniclastic rocks) and appear related. Slivers of the Wyman Formation (felsic volcanic and volcaniclastics and local sedimentary rocks) are also present in the area. These anomalies are much smaller in amplitude than Anomaly 200 and it is possible the same type of causative body is responsible for these anomalies as Anomaly 200, most likely thin BIF units along a faulted contact between the Euro Basalt and Cleaverville Formation. Next Steps: Westar will integrate the plate models and results of the Newexco findings with other geophysical datasets to plan for field reconnaissance during the upcoming field season. Future work programs will include ground-truthing of the identified anomalies, field mapping, rock-chip sampling and establishing access and logistical constraints for potential future ground-based geophysics (such as Moving Loop Electo-Magnetic, MLEM survey) and, if ultimately justified, drilling.