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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

Braeside High Grade Zinc  Zn –Pb–Cu–Ag-Au–V Project , East Pilbara, Western Australia

Exploration target(s)

  • Porphyry related structurally controlled high-grade Zn-Pb-Cu-Ag-V breccia pipes
  • High level (epithermal) base metal veins
  • Sediment hosted disseminated base metal replacement zones
  • Porphyry related stock-works

The Braeside Project lies 140km east of Marble Bar and is located on the eastern margin of the Pilbara Craton in the northwest of Western Australia (see image 1). The project hosts the Braeside Pb-Ag-Zn mining district which includes the Ragged Hills mining centre (discovered in 1901) and numerous small mines along a series of north trending structures (informally called the Braeside Fault Zone - BFZ). The historic mines were operative from 1925 to 1967. The BFZ contains high grade poly-metallic mineralisation over 34km of strike with dominant galena and associated sphalerite and chalcopyrite. The BFZ and associated mineralisation are hosted in Fortescue Group mafic volcanics and volcaniclastics (Maddina Basalt and the Kylena Basalt).  The Koongaling Felsic Volcanics sequence is the same age as the Kylena Basalt (bimodal) and lies further east.

Rumble has 70% of granted licence E45/2032 and holds 100% of 5 contiguous exploration licences. To the north of the granted licence, Rumble has an option on the Barramine Project which lies along strike from the BFZ. The total area of prospective terrane for high grade Zn–Pb Cu, Ag and Au deposits is now over 1000km² with over 60km of minerlaised strike.

Prior to Rumbles acquisition there had been no modern systematic exploration on the high-grade Braeside project.

Image 1: Braeside Regional Project Location, Regional Geology and Tenements

Exploration Model - Preserved Near Complete Porphyry to Epithermal System 

Rumble completed only the second regional RC drill program at Rumble’s flagship Braeside Project, which discovered significant high-grade lead and wide zones of barium. Furthermore, the exploration results have defined four systems of mineralization that are associated with a large porphyry related polymetallic vein system with mineralization over a strike length of 35km and up to 6km in width.

The new interpretation of the porphyry related geological model has identified a preserved, near complete porphyry to epithermal system, which is a rare discovery for Archaean age rocks. The exploration model is based on the results and interpretation of geology, alteration and mineralization from the RC drilling completed.

The exciting new development has significantly upgraded the Braeside Project to a regional scale base metal system located in the East Pilbara/Paterson region known for large scale deposits.

Rumble will now be targetting large Cu-Au disseminated porphyry deposits along with high grade base metal vein/breccia pipe and epithermal Pb-Zn-Ag-In+/- Au deposits. Rumble understands that to have three deposit type targets at one project is a unique occurrence, providing Rumble shareholders with significant exposure to exploration results and discovery.

Image 2: Braeside Geological/Alteration Model

Target Types within the 4 Zones & Exploration Stages for 2019 

  1. The Lightning Ridge Eastern Zone 

Represents the highest deposition level discovered so far at Braeside. The northwest trending vein/feeder is dominantly galena – silver mineralization with high grade indium. Alteration is pervasive chlorite with low level sphalerite and red-orange adularia veinlets. Lightning Ridge is controlled by late terminating north trending faults. Geological mapping has highlighted numerous untested northwest trending vein sets that will be targeted in the upcoming field season.

Target: Multiple vein high-grade Pb-Ag-In epithermal/epizonal deposits with Cu – Zn

  1. The Boom Boom Mancini, Gossan East, Barker Well Central Zone

Represents the next (lower) deposition level to the Lightning Ridge system. Quartz – sulphide vein sets typically have a silica halo, rarely feldspar-sericite with a strongly developed broad chlorite – Zn enriched haloes and adularia veinlets. Mineralisation is Pb - Zn dominant. Later overprinting deformation (shear zones and faults) often develops Cu with minor Ag and Au.

The system extends over a strike of at least 15km and is open north into the Barramine JV.

Target: Multiple high-grade base metal (Pb dominant) sulphide – silica veins/breccia pipes deposits within broad disseminated base metal zones.

  1. The Devon Cut – Mt Brockman 2 Central Zone

Represents a lower deposition level to the Boom Boom Mancini – Gossan East – Barker Well system. Silica – sulphide fracture/feeder/vein zones are associated with pervasive sub-alkalic feldspar – silica – sericite alteration with generally broad chlorite haloes often with elevated Zn. Mineralisation is dominant Zn – Pb. Cu is often associated with later overprint. Lower order Au and Ag occurs with the higher-grade base metal zones. Vanadium (vanadate) has developed in some areas

The system occurs as three separate vein sets that strike over 20km.

Target: Multiple high-grade base metal (Zn dominant) sulphide – silica veins/breccia pipes deposits within broad disseminated base metal zones

  1. The Barium Ridge – Sugar Ramos mineralized Western Zone 

Represents the lowest deposition level discovered to date at the Braeside Project. Wide pervasive zones of Ba Kspar with silica zones and strong chloritisation of the wall-rocks have ubiquitous low order Pb mineralization along with anomalous Rb (rubidium). Only two areas, 9km apart, have been drill tested by the current programme. At Barium Ridge, the alteration has completely replaced the andesitic basalt host rocks. Anomalous gold has been intercepted (0.96 g/t) and within the alteration zones, pyrite-silica zones are present.

The Sugar Ramos area is considered very significant as magnetite – actinolite has been defined with zones of elevated copper (chalcopyrite) and gold (see image 8 for details). Central to the core of the broad alteration halo, intense sericite zones are present, potentially indicating higher temperature acidic fluid pathways have developed above a porphyry intrusion.

Image 3: Target Types within the 4 Zones & Exploration Stages for 2019 


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