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Office Location

Head Office

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

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

Munarra Gully Cu-Au-Co Project, Cue Western Australia

Exploration Targets are Multiple Copper-Gold bearing mafic (norite) intrusion deposits and High Grade Lateritic Cobalt Deposits

Rumble Resources Ltd and option agreements to acquire 80% of tenements E51/1677 and M51/122 and owns 100% of E51/1919 and E51/1927 that form the Munarra Gully Cu-Au Project with Ni – Co potential some 50km NNE of the town of Cue within the Murchison Goldfields.  

Image 1. Munarra Gully Project on historic magnetics 

M51/0122 – White Rose Copper-Gold Prospect

A differentiated copper-gold bearing mafic sill has been defined at the White Rose Prospect.  

RC drilling includes:

  • 22m @ 1% Cu from 29m coincident with 19m @ 2.19 g/t Au from 33m. Maximum Cu was 2.66% (40-41m). Maximum Au was 11.56 g/t (49-50m). 
  • 10m @ 0.74% Cu from 75m coincident with 11m @ 0.73 g/t Au from 75m.
  • 26m @ 0.79% Cu from surface and 7m @ 0.64% Cu from 28m. In addition, 5m @ 1.17 g/t Au from 13m, 5m @ 0.71 g/t Au from 20m and 9m @ 1.64 g/t Au from 27m.
  • ⃰ 23m @ 0.54% Cu from 45m and 6m @ 0.66% Cu from 70m.
  • ⃰ 15m @ 0.88% Cu, 0.77 g/t Au from surface

      Including 8m @ 1.1% Cu, 0.96 g/t Au from 4m

  • ⃰ 21m @ 0.75% Cu, 0.53 g/t Au from 24m

Entire hole mineralised – 78m @ 0.34% Cu, 0.23 g/t Au (0.1% Cu cut-off)

  • ⃰ 24m @ 0.71% Cu, 0.33 g/t Au from 65m

⃰ 0.5% Cu lower cut off

Image 2 – White Rose Prospect - Plan of 350m strike differentiated Mafic Sill with Significant Intercepts over Interpreted Geology

  • Mineralisation is considered ortho-magmatic and is associated with disseminated chalcopyrite, bornite and pyrite. The background copper is elevated for the width of the entire sill (500 – 1000ppm Cu). Mineralisation is generally low sulphur and is concentrated at the base of the mafic phase of sill.
  • The mineralised sill is interpreted to be a feeder channel, part of a larger sill complex with potential for significant mineralisation down plunge – modelling indicates the three RC traverses drilled by Rumble have only tested the upper extent of what may be a much larger system below
  • The mineralised sill feeder zone is over 350m in strike and up to 150m in width and open at depth, with significant scale potential

                                                     Image 3. RC Drill section 615325E – White Rose Prospect

                       Image 4 – White Rose Prospect Section 615580E – Significant Intercepts with Geology

Significant Copper–Gold Mineralisation Potential and Next Stages

The current drilling has identified a preserved copper-gold mineralised basal zone that is associated with a differentiated mafic sill (up to 150m thick) at White Rose. The preserved mineralisation is likely part of a larger mafic sill complex that has been further intruded by a series of younger dolerite and gabbro dykes. Rumble has now completed three (3) RC traverses (relatively shallow drilling) which have confirmed 350m of strong copper-gold mineralisation.

Rumble considers the ortho-magmatic copper-gold mineralisation to be a sill-like feeder zone/channel with potential for higher grade sulphides to occur down the dip plunge (at deeper levels) rather than along strike.

  • Important: The three RC traverses drilled by Rumble and subsequently modelling appear to have only tested the upper extent of a much larger system below  (see image 7).

                                          Image 5 – White Rose - Sectional (615580E) Geological Interpretation

Important: The style of mineralisation is likely magmatic and is atypical with respect to mineralised mafic intrusive systems due to high Cu:Ni ratios, high Au and Ag, low S and elevated PGM’s. The style is similar to known large copper rich mafic intrusive (ortho-pyroxenite) historical deposits in Brazil (Caraiba mining district – 96Mt @1.82% Cu reserve and production) and South Africa (Okiep mining district – Koperberg – 94Mt @ 1.75% Cu historic production). Gold, silver and PGM’s are associated with these copper deposits.

Next Steps                        

White Rose Prospect

Mineralisation is disseminated, sulphur poor and not magnetic (mafic sill has a low magnetic response) at the White Rose Prospect and therefore not conducive to ground TEM (transient electromagnetic) or detailed magnetic exploration methodologies.

  • Orientation IP (induced polarisation) will be conducted over the prospective mafic sill to potentially delineate chargeability and “bulk conductivity” targets at depth for drill testing.

Munarra Gully Regional

Rumble considers the White Rose differentiated Cu-Au mafic sill to be part of a larger sill complex. Widespread Cu anomalism occurs over some 25km of strike. Regional air core drilling (see table 2) has highlighted the high background copper over some 10km of strike. Given the significant cover over the project area, there is significant potential to find additional copper-gold bearing mafic sills.

  • To find other differentiated Cu-Au mafic sills within the Munarra Gully Project, copper geochemistry is the most effective tool. Further shallow air core drilling is planned to test the inferred copper-gold corridor over the 25km of strike.

​E51/1677 – New Shallow High-Grade Cobalt-Platinum Discovery

First pass reconnaissance air core drilling has discovered high-grade lateral Cobalt – Platinum mineralisation under shallow cover. Single metre assaying includes:

  • 2m @ 0.48% Co, 220 ppb Pt from 18m
  • 3m @ 0.37% Co, 75 ppb Pt from 14m
  • 2m @ 0.20% Co, 203 ppb Pt from 11m
  • 1m @ 0.55% Co, 382 ppb Pt from 13m
  • Co-Pt mineralisation is associated with a strongly lateritised pyroxenite intrusive under 5m of cover – indicating high potential for high-grade laterite cobalt deposits under shallow cover.

          Image 6 – Cobalt Prospect – Air Core Drilling Significant Intercepts over Airborne Magnetics – 1VD UC 30

High-Grade Cobalt Prospect - Mineralisation Potential and Next Stages

The high-grade cobalt mineralisation has been defined by a single air core drill traverse with close spaced (50m) follow up traverses that has demonstrated the high-grade cobalt mineralisation continuity. The prospect is part of a series of variable ultramafic units, some which have been identified as pyroxenites.

  • The Co – Pt mineralisation is completely open along strike - There is over 10km’s of strike within the ultramafic units that occur along a strongly magnetic trend (see image 2).
  • The regional air core drilling by Rumble has only tested a very small percentage of this prospective ultramafic package.
  • High potential for high-grade shallow laterite cobalt deposits

Next Steps

  • Rumble will fast-track systematic shallow air core traverses along strike to scope out any high-grade lateritic cobalt mineralisation, with up to 10km of strike potential

        Image 7 – Location of Air Core and RC Drilling over Airborne Magnetics – Cobalt and White Rose Prospects

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