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Head Office

Suite 9, 36 Ord St
West Perth, Western Australia 6005

Tel: +61 8 6555 3980
Fax: +61 8 6555 3981

Fraser Range Projects Joint Venture - IGO 70% RTR 30%

Exploration targets is Massive Ni – Cu type deposits, palaeo-channel gold and basement gold deposits 

Rumble secured the involvement of leading base metal and gold miner Independence Group NL (ASX: IGO) to explore and earn an interest in its highly prospective projects in the Fraser Range region of WA (Image 1) (Fraser Range Project).

IGO has earned its 70% interest in Rumble’s Fraser Range tenements - Rumble is now free carried to completion of a PFS.

             Image 1 – IGO 70% Rumble 30% JV - Fraser Range Projects

Thunderstorm Project

The Thunderstorm Project lies within the Albany – Fraser Province and is located some 250km SSE of Kalgoorlie, Western Australia. The Thunderstorm Project comprises of four exploration licences, E28/2366, E28/2528, E28/2529 and E28/2595 for a total area of 323km². 

Exploration by Independence Group (IGO)

First stage exploration by IGO utilised the Spectrem AEM system to map out depth of cover and to highlight conductors under shallow cover. The Spectrem AEM system is a high-definition fixed-wing, time domain airborne electromagnetic geophysical technique. The Spectrem AEM system also acquires magnetics data.

Following the geophysical survey, regional air core drilling is completed (drilling is ongoing) on wide spaced patterns (3km by 400m and 1.5km by 400m). The aim of the regional air core drilling is to test the cover depth, basement and regolith geology and geochemistry, and to highlight anomalous trends. Favourable conductors defined by the Spectrem AEM survey are then further tested by GTEM (ground transient electromagnetics) and if high priority, are drill tested by reverse circulation /diamond drilling.

Image 2 – Thunderstorm JV Project – Location of AC drilling over mapped Palaeo-drainage (from Spectrem AEM) with Au

Geophysics (image 2)

The Spectrem AEM survey has defined two major palaeo-drainage systems that cover up to 50% of the area of the Thunderstorm Project. The palaeo-drainage comprise of Tertiary – Quaternary sediments and is up to 100m in depth.

Air Core Drilling (image 2 and 3)

IGO has completed 305 holes for 25,741 meters within the Thunderstorm JV. Many holes are awaiting final check assays. All holes are vertical and are routinely assayed as 4m composites.

Image 3 – Thunderstorm JV Project – Location of Main Au Mineralisation over Palaeo-drainage (from Spectrem AEM)


Themis Prospect High-Grade Gold Intercept (image 3 and 4)

Drill hole 18AFAC30771 from 1m resplit assaying returned:

  • 25m @ 2.42 g/t Au from 42m (0.1 g/t Au lower cut off – exploration)* and

                            Includes 5m @ 10.85 g/t Au from 49m (1 g/t Au lower cut off)*.

* 1m resplit assays – All other assays are 4m composites

The mineralisation is hosted by the lower part of a poorly consolidated channel fill sequence. The mineralisation persists into an underlying, highly weathered, foliated feldspar-biotite-garnet gneiss. The paleochannel is clearly visible in IGO’s Spectrem AEM survey and is at least 55 meters deep.

       Pion Prospect Gold Intercept (image 3)

Drill hole 18AFAC20486, from 4m composite assaying returned:

  • 4m @ 3.8 g/t Au from 86m and 4m @ 0.34 g/t Au from 106m.

This mineralisation is entirely hosted within a complex sequence of carbonaceous clays, sands and quartz gravel that fill a paleochannel at least 124m deep. The mineralisation ceases 10m above the contact to weathered pyroxene-biotite-quartz gneiss.

Important: The Themis and Pion occurrences lie on the same palaeo-drainage system some 11km apart (13km by palaeo-drainage), highlighting the scale potential.

                             Image 4 – Themis Prospect Drill-hole 18AFAC30771 Section with Significant High-Grade Au Intercept

Conclusions and Next Steps

The identification of significant high-grade gold mineralisation in wide-spaced drilling, within a large complex palaeo-drainage system over a broad area, highlights the potential for both palaeo-channel and basement gold deposits.

Rumble considers the Themis Prospect gold mineralisation as the most significant gold intercept in recent years in the Fraser Range outside of the Tropicana gold system.

The main palaeo-drainage has not been tested between the two main intercepts (18AFAC30771 and 18AFAC20486), a distance of 11km (13km by drainage), highlighting the scale potential.

Drilling by IGO has outlined numerous >100ppb Au air core drill-hole intercepts (see image 3) on other palaeo-drainages that feed into the main system.

Further exploration by IGO will consist of infill air core drilling planned to test the high-grade gold mineralisation.

IGO is also completing broad-spaced (1.5km by 400m) air core drilling over the remaining untested areas – Assays Pending

Thunderdome Project

The Thunderdome Project (E28/2366) covers 140sq km’s in the main Fraser Range Gravity ridge associated with dense mafic/ultramafic rocks of the Fraser Range.

It has a large prominent dome feature clearly visible on regional airborne magnetic images. This large dome feature is one of the largest in the Fraser Range and has a fold axis of some 22km. Within this larger target area are also several smaller features which may represent later stage intrusions.

Previous exploration for nickel and copper has recently been carried out by Ponton Minerals which is part of the Creasy Group. This regional exploration was of reconnaissance air core drilling on a 5km by 15km spacing with two holes within the current project area of E28/2366. One of the historic aircore drill holes (PNAC036) was highly anomalous in copper and zinc.  Drill hole PNAC036 returned an intersection of 6m @ 0.11% Cu & 0.28% Zn from 51m (EOH 109.5m). This intersection was within a carbonaceous unit which is part of the cover sequence. 



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