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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

Braeside Cu-Zn-Pb-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
  • Volcanogenic hosted massive sulphide type systems (VMS)

The Braeside Project, located in the east Pilbara region of Western Australia, oomprising 673 km2, consisting of E45/2032 (RTR 70%), E45/4368 (RTR 70%), E45/4874 (RTR 100%) and E45/4873 (RTR 100%) located 129km east of Marble Bar in the East Pilbara Region of Western Australia.

Image 1: Braeside-Barramine Project – Tenure, Regional Geology

Target Generation - Completion of 3 Years Systematic Exploration

  • Regional Scale Porphyry to Epithermal System from surface
  • Large-scale mineralised system over 60km in strike and 8km in width
  • 45 Priority Cu-Au-Zn-Pb-Ag targets generated - all capable of discoveries
  • Camp Scale Potential with 5 deposit types delineated

Rumble acquired the Braeside Project in April 2017. The project hosts many historic high-grade, base metal, small-scale mines including the high-grade Ragged Hills mine that produced high-grade lead, zinc and silver up until 1959. Prior to Rumble’s acquisition no systematic modern exploration had been completed at Braeside. The first phase of systematic exploration commenced in May 2017 and over a period of 3 years, and multiple phases of exploration Rumble has now generated forty-five (45) Cu-Au- Zn-Pb-Ag-priority targets, all capable of significant discoveries.

The 45 targets generated by Rumble are presented in images 3 to 6. Five deposit types have been inferred by Rumble and are explained in the section below titled Geological Mineral Deposits Types.

Priority Target Ranking

  • 12 High Priority Targets - have been identified where confidence highest based on exploration work completed. These are “drill ready”.
  • 14 Medium Priority Targets - have been identified where confidence is moderate based on exploration work completed which may be considered for further drill testing or target definition.
  • 19 Low Priority targets have been identified where confidence is low based on exploration work and requires additional targeting prior to drilling.

Image 2 – Northern Braeside – Location and Status of Prospects – Plan A1   

Image 3 – Central Braeside – Location and Status of Prospects – Plan A2

Image 4 – Southern Braeside – Location and Status of Prospects – Plan A3       

Geological Mineral Deposit Types

Exploration along with spectral mineral mapping and alteration studies (includes two CSIRO studies) has outlined at least five (5) Zn-Pb-Ag-Cu-V-Au styles of mineralisation at Braeside.

Image 5 – Braeside Project – Braeside Geological/Alteration Model

Porphyry Related Polymetallic Vein Deposits (image 5)

A large-scale NNW trending mineralised fracture system extends over 60km at Braeside. The fracture system comprises of multiple open vein sets/zones with wide intense alteration haloes hosted in predominantly andesitic basalts with intercalated volcaniclastic sediments. Up to four (4) vein/zone styles have been recognised with polymetallic epithermal veins (higher deposition level) occurring in the eastern part of the fracture system ranging to deeper deposition levels to the west where large barium Kspar zones occur close to a major flat lying hiatus (Hamersley Formation/Fortescue Formation contact). Image 5 presents the porphyry related polymetallic vein deposit geological model. The dominant sulphides are galena and sphalerite with significant silver, copper and vanadium occurring at appropriate deposition levels. Low level gold develops preferably in the lower Ba Kspar zone along with elevated copper and rubidium.

In summary, the high-level mineralisation to the east is considered epithermal polymetallic style with elevated silver to 1108 g/t and indium to 515 g/t. The lower level mineralisation to the west is considered to lie in the upper carapace zone to an alkalic porphyry system with characteristic intense sericite alteration with zonal calcic alteration (actinolite) and magnetite. Gold to 1.45 g/t (grab) and 1m @ 0.96 g/t are associated with intense barium oxide Kspar (celsian-hyalophane) altered zones. Disseminated chalcopyrite occurs within the alteration zones.

Rumble considers the potential for porphyry related polymetallic deposits is high. Targets include:

  • Multiple, structurally controlled high-grade Zn-Pb-Ag-Cu-V breccia pipes and epithermal veins.
  • Cu +/- Au with Zn-Pb-Ag sheeted vein system related to the upper altered carapace zone to a deep alkalic porphyry.

Sediment Hosted Non-Sulphide Zn Deposits

Associated with the large-scale NNW trending fracture system are flat lying zones of low to medium grade Zn occurring as sauconite (Zn smectite). Sauconite occurs in fresh fine to medium grain volcanic siltstones and sandstones with grades up to 3% Zn. The sauconite is not considered a “later” secondary process and likely represents syngenetic mineralisation associated with the fracture system. Dating has shown the age of the Pb mineralisation (associated with Zn) is the same as the host andesitic basalts and volcaniclastics and the nearby fertile Koongaling Felsic Volcanics (thought to be the source of the metals). The sauconite potentially developed in the surface porous sediments in the early stages of diagenesis as mineralisation fronts pervaded from the mineralising fracture zones.

Rumble considers the potential for large flat lying non-sulphide Zn mineralisation zones (sauconite) is high, especially between multiple fracture systems where flow-through fluid convection with hydraulic/hydrostatic pressure may occur.

Shear Hosted Pb-Zn-Cu-V Zones (image 2, 3 and 4 for locations)

In the northern portion of the Braeside Project, significant mineralisation associated with sheared felsic and andesitic rocks occur at the Camel Hump, Camel Hump South and Barramine Cu prospects (see image 3 and 4). High-grade Pb, Cu, and V occur with Ag and Zn within a NW trending shear zone (predominantly under cover) over a strike of 2km at the Camel Hump prospects. Grab sampling has returned:

  • Cu to 8.62%, Pb to 31.9%, V2O5 to 1.2%, Ag to 137 g/t and Zn to 2.07%.

At the Barramine Cu prospect, workings (partly covered) occur over a NW trending strike of 1km with Cu to 28.2% and Ag to 101 g/t.

The style of mineralisation (epigenetic) is fault/shear-controlled zones – polymetallic orogenic shear zone type.

Sediment Hosted Syngenetic Zn Sulphide Deposits

Onlapping Hamersley Formation shales (Jeerinah Formation) immediately west of the andesitic basalts hosting the Braeside Base Metal Fracture System are strongly elevated with zinc, lead, silver and gold. The Jeerinah Formation is a very regionally extensive (with significant black shale) shale formation (up to 1800m thick) derived from a sulphate rich sea beginning around 2.63Ga. The underlying Fortescue Formation was formed between 2.78 – 2.63Ga. Within the Jeerinah Formation and immediately west of the main Hamersley Formation basal contact, bimodal volcanics (mafic and felsic – Barramine Volcanic Member -1km thick) occur within the Jeerinah Formation. The implication is a rift tectonic margin may have developed with potential for SEDEX and VMS style deposits.

Exploration by Rumble has highlighted significant Zn in soil anomalism (up to 1858ppm) and grab sampling has returned up to 1.83% Zn from shale with elevated gold to 0.21 g/t. Three prospect/targets are considered sediment hosted syngenetic Zn sulphide type (Bayonne Bleeder, Bonecrusher and No Dice Chicun – see images 3, 4 and 5 for locations).  Rumble considers the main Hamersley/Fortescue Formation contact and the overlying shales with intercalated bimodal volcanics (later reactivated volcanism after the main Fortescue volcanic events) to be prospective for SEDEX and VMS base metal deposits.

 

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