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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.  

Ongoing interpretation and evaluation has identified a regional structural zone as the main control for significant copper, gold and cobalt mineralisation within the Munarra Gully Project.

  • The mineralised structure is interpreted to extend over 34 km and significantly upgrades the prospectivity for large mafic hosted copper gold deposits
  • Three significant prospects associated with the structure are the Munarra North Cu-Au, White Rose Cu-Au and Co Prospects

Image 1. Munarra Gully Project - Location of Prospect over Regional Magnetics

Munarra North Copper-Gold Prospect  (image 2 & 3)

Two exploration licence applications (ELA51/1919 and ELA51/1927 – 100% RTR) cover the northern extension of the highly prospective regional structure (shear zone). 

Review of historic exploration on recently acquired exploration licence applications (RTR 100%) has highlighted the potential for a large copper bearing mafic hosted intrusive complex at the Munarra North Prospect.

  • Significant copper mineralisation is associated with a large mafic intrusion under shallow cover at Munarra North.
  • Copper with gold and silver defined over a strike of 1.2km and is completely open along strike and down dip
  • Historic reconnaissance drilling has indicated copper anomalism occurs over a strike of 6km and is completely open
  • The copper bearing mafic intrusion is 150m in width
  • The style of mineralisation is considered similar to White Rose which is constrained to a strike length of 350m, however at Munarra North the large scale tonnage potential for multiple deposits is compelling with over 6km’s of strike and completely open
  • Important:  Historic exploration focused on gold exploration and limited partial copper assaying was completed on 5 diamond drill holes (also some very limited RC holes) at Munarra North. 

       Historic Cu-Au-Ag intercepts (partial Cu assays) include:

  • 8m @ 1.31% Cu, 0.83 g/t Au from 104m
  • 5m @ 1.7% Cu, 0.82 g/t Au, 21.2 g/t Ag from 139m
  • 8m @ 0.52% Cu, 4.24 g/t Au, 11.75 g/t Ag from 161m
  • 3m @ 0.96% Cu, 0.67 g/t Au, 20 g/t Ag from 203m

   Significant Au mineralisation (not tested for Cu) including:

  • 14m @ 2.36 g/t Au from 57m
  • 51m @ 0.8 g/t Au from 35m
  • 45m @ 0.89 g/t Au from 65m

  Broad zones of alteration and anomalous Au (not tested for Cu) including:

  • 30m @ 0.89 g/t Au from 90m (EOH)
  • 81m @ 0.32 g/t Au from 35m
  • 69m @ 0.24 g/t Au from 35m (EOH)

Image 2 – Munarra North Prospect – Drill Hole Location Plan with Significant Results

Regional air core drilling (historic) north of the Munarra North Prospect (Image 3) tested for continuity of mineralisation under partial lake cover. Four drill hole traverses (reconnaissance) were assayed for Au and Cu and highlighted the continuity of the mineralised structure with anomalous gold and copper. The northernmost line (image 3) was not assayed for copper, however, it was anomalous in gold. The historic drilling has outlined a north trending zone of copper-gold anomalism over a strike of 6km (including the Munarra North Prospect)

Image 3 – Munarra North – Area Prospectivity Plan

M51/0122 – White Rose Copper-Gold Prospect

Recent drilling by Rumble has defined copper – gold mineralisation associated with the basal zone of a differentiated mafic sill. Approximately 350m of strike of the prospective sill has been preserved at White Rose (sill subjected to faulting and regional shearing). Mineralisation is considered to be magmatic and has developed as disseminated sulphide (bornite, chalcopyrite and pyrite) at the base of the sill. RC drilling by Rumble has returned significant copper gold intercepts including:

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

Potential for Multiple Magmatic Copper-Gold Deposits Hosted in Mafic Intrusions

Previous explorers focused on shear hosted gold at Munarra North rather than the extensive copper mineralisation occurring over a strike of 6km which is completely open (along strike and down dip). Rumble has recognised magmatic Cu-Au mineralisation hosted in a differentiated mafic sill at the White Rose Prospect whereby significant Cu – Au mineralisation (22m @ 1.00% Cu from 29m coincident with 19m @ 2.19 g/t Au) was delineated.

The similarities between the Munarra North and White Rose mineralisation are very significant and Rumble considers the Munarra North area as having potential for multiple economic deposits.

Similarities between Munarra North and White Rose include:

  • Mineralisation is non-magnetic and non-conductive.
  • Mineralisation is disseminated within mafic intrusive (dolerite).
  • Although limited multi-element geochemistry at Munarra North, elemental associations are gold, copper and silver.
  • The White Rose differentiated sill is approximately 150m wide. The mafic intrusion at Munarra North is 150m wide.
  • Munarra North is a very large system (large scale tonnage potential) with a strike length of at least 6km (completely open). White Rose a fault constrained system with a strike of 350m.

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.

​E51/1677 – High Grade Cobalt Prospect

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 5 – 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 6).
  • 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

        Image 6 – Location of Air Core and RC Drilling over Airborne Magnetics – Cobalt and White Rose Prospects

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