MutoorooHigh Resolution Airborne EM Survey
ASX Announcement 18 March 2019
HIGHLIGHTS
- Airborne EM survey planned for April to explore for Mutooroo style massive sulphide mineralisation within the Mutooroo Copper-Cobalt District.
- Survey will cover a 266 km2area in the vicinity of the Mutooroo deposit where recent surface sampling has identified several high priority copper-cobalt geochemical anomalies.
- Results will assist in identifying potential sulphide hosted coppercobalt drilling targets within trucking distance of the Mutooroo deposit.
Havilah Resources Limited (Havilah) is pleased to report that a detailed, high resolution, airborne electromagnetic (AEM) survey is planned to commence in mid-April (see Figures 1 and 2).
The AEM survey forms part of Havilah’s strategy to explore for additional copper-cobalt resources in the Mutooroo Copper-Cobalt District. This type of detailed AEM survey has never been flown over Havilah’s priority targets in the vicinity of the Mutooroo deposit and should be highly effective in identifying Mutooroo style massive sulphide mineralisation, based on previous orientation EM surveys.
The survey will be flown by UTS Geophysics utilising the VTEM TM Max Time Domain EM system. Approximately 1,344 line kms will be flown on 200m spaced lines using 1250/3050 line orientation to provide the best coverage of the interpreted north-northeast trending stratigraphy. It will cover an area of approximately 266 km2 and take at least three weeks to complete. Final data, maps and report are expected two to three months after program completion.
This type of AEM survey has proven to be very effective in detecting massive sulphide mineralisation at depths in excess of 200m (link to VTEM TM Max case study on the Caber massive sulphide deposit). The absence of thick conductive overburden and the shallow depth of oxidation (massive sulphides at approximately 30-40m depth at Mutooroo and Scorpion) within the Mutooroo area should aid in its effectiveness. Compilation of previous airborne EM surveys has highlighted a large gap in the detailed coverage which this survey will fill.
The AEM program is planned to cover (see Figure 1):
- Strong copper ± cobalt surface geochemical anomalies identified by Havilah in 2018 including at Sidewinder, Mutooroo South and Copperhead, (refer ASX announcement of 28 August 2018).
- The existing massive sulphide drill target at Scorpion and extensions along the Scorpion Trend magnetic anomalies (refer ASX announcement of 26 April 2018).
- The King Brown Prospect where previous drilling intersected anomalous near surface copper mineralisation.
- Areas under shallow cover (not suitable for surface sampling) and areas where surface sampling has not been completed.
Several survey lines will cross the Mutooroo sulphide lode system which should provide strong conductive responses against which to benchmark other conductive responses from this survey (see Mutooroo EM response from an earlier regional AEM survey in Figure 3).
Follow up exploration activities are likely to include ground EM surveying and drill testing of selected targets.
Figure 1 – Area of planned VTEM coverage around Mutooroo showing Havilah tenements (shaded) and existing prospects on aeromagnetic image.
Lab Assays Upgrade Grants Basin Iron Ore
ASX Announcement 21 January 2019
HIGHLIGHTS
- 18% average increase in grade confirmed by laboratory assays of percussion drilling samples vs. earlier reported field Niton XRF iron analyses.
- Upgraded intersections include 296m @ 24.37% Fe, 272m @ 25.48% Fe and 254m @ 26.21% Fe.
- Diamond drilling underway to provide samples for preliminary metallurgical testwork.
Havilah Resources Limited (Havilah) is pleased to report that final laboratory assays have now been received for reverse circulation (RC) drill samples from the recent Grants Iron Ore Basin drilling (refer ASX announcement 4 December 2018). There is an improvement in the laboratory iron assays compared to the preliminary handheld Niton XRF iron analyses as reported in the above ASX release by an average of approximately 18%
Figure 1: Overview map showing the recently completed RC drill holes and the currently underway diamond hole GBDD014 in the Grants Iron Ore Basin on magnetic image showing the interpreted surface expression of the basin and the existing Grants Resource outline and drill holes.
Figure 2: Zoomed in view of recently completed RC drill holes and the currently underway diamond hole GBDD014 (extension of GBRC006) and drill intersections calculated using the final laboratory assay results. Note “NSI” = no significant intersection.
This drilling is part of a comprehensive program of work currently being performed and funded by SIMEC Mining (an affiliate of the GFG Alliance) as part of their due diligence investigation of the commercialisation potential of Havilah’s Maldorky and Grants iron ore projects. The drilling program was implemented and supervised by Havilah personnel.
