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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

Earaheedy High Grade Zinc Project, Wiluna Western Australia

Exploration target(s) are flat lying MVT (Mississippi Valley Type) carbonate hosted Zn-Pb deposits and associated higher angle Zn-Pb fault breccias.

Rumble Resources Ltd has a binding option agreement to acquire up to 75% of the Earaheedy Zinc Project (E69/3464 – 75 km²) and 100% of application E69/3543, located approximately 110km north of Wiluna, Western Australia, covering most of the known zones of primary carbonate-hosted zinc –lead mineralisation in the Earaheedy Basin.

                               Figure 1.  Project Location and Regional Geology – Earaheedy Project

Historic Exploration Overview

Broad spaced drilling (completed in the 1990’s) defined several prospects containing oxidised and primary Zn-Pb mineralisation (zinc dominant), most of which are confined to a single, flat lying to shallow northeast dipping laterally continuous dolomite horizon over 20 kilometres strike. The initial drill spacing was 5 to 10km. The current drill spacing is approximately 1km by 1km. Three prospects

Review of the historic drilling has concluded that approximately half the drill holes did not intercept the target horizon.

A total of 64 drill holes were previously completed within the project area (E69/3464), with 35 drill holes intercepting the stratiform zinc horizon (including partial end of hole intercepts). The historic drilling was completed by Renison (RGC) 1991 -1992 and Zenith in 2007 (8 RC holes completed). Rumble is confident that all holes are located accurately and the sampling and assay techniques represent best practice for the period. 

Mineralisation has been defined over an area of approximately 20km by up to 3.5km in width and is completely open.

                                  Figure 2. Project Geology and Significant Drill Hole Intercepts (also see figure 3)

Significant Zn and Pb intercepts include:

  • TDH4 – 11.3m @ 4.34% Zn, 0.85% Pb from 150.2m including 2.3m @ 14.42% Zn, 1.15% Pb from 150.2m
  • TDH28 – 55m @ 0.87% Zn from 323m including 11m @ 1.2% Zn from 325m and 5m @ 2.32% Zn from 354m
  • TDH14 – 31m @ 1% Zn from 222.5m including 10.4m @ 3.28% Zn from 225m
  • TRC70 – 5m @ 2.52% Zn from 126m to EOH
  • TRC47 – 20m @ 1.86% Zn from 103m to EOH
  • TRC49 – 6m @ 1.36% Zn from 112m to EOH
  • NRC09 – 4m @ 1.7% Zn from 127m to EOH

Significant silver (Ag) mineralisation intercepts include:

  • TDH16 – 4m @ 559 g/t Ag (18oz/tonne) from 257m and 2m @ 149 g/t Ag from 223m

Gravity Survey and Targets (Figures 3, 4 and 5)

Two surveys covering an area of 24km² were completed on 100m by 100m and 200m by 100m spacings (1080 stations). The surveys targeted the main basement fault zone (interpreted from aero-magnetics) and the stronger base metal drill-hole intercepts from the historic drilling. Gravity inversion modelling has defined six (6) first order targets that occur over the main basement fault structure (Figure 3.). The targets are determined by variations in density contrasts (iso-shells). Targets EG1 to EG6 (see figures 3 & 5) are defined by the 0-200 (0.20 g/cm³) iso-shell.

Of Importance:

  • The six gravity targets sit below the overlying Frere Iron Formation and their dip length strongly correlates with width of the carbonate formations that host the historic Zn mineralisation (see figure 4).
  • The steep dip of the gravity targets (steep southwest) also reflect the inferred dip of the underlying basement fault.
  • The depth of the gravity targets gradually deepen to the southeast in line with the basement fault and dip of the hosting sediments.
  • The gravity targets (EG1 to EG6) are interpreted to be associated with high angle fault/fault breccias that extend from the basement and are hosted in the main carbonate units.
  • The targets represent bodies defined by density contrasts and these bodies may reflect denser carbonate rich zones or more significantly (based on the widespread Zn and Pb metal distribution), base metal mineralisation (epigenetic replacement).
  • The gravity targets (iso-shells) are up to 1.5km in strike length (EG1) and up to 300m in width.
  • Review of the historic drilling has indicated no drill hole has intercepted any of the gravity targets.
  • Historic drill holes that are close to the gravity targets include TDH19 (approximately 250m into the hanging wall of target EG1 - see figure 4) which returned a wide low-grade intercept of 56m @ 0.46% Zn from 209m.

                             Figure 3.  Drill Hole Intercepts with Gravity Targets over TMI Aeromagnetic Plan – Southeast Area

                      Figure 4 - Section AA (see Figure 3 for location of target) – Mineralisation Model and Proposed Target

       Figure 5 - 3D Image of Gravity Targets (Isoshells) highlighting historic drill holes not intersecting gravity shells– (See figure        3 for locations)       

Target Potential and Style

The target style for the Earaheedy Zn project is considered Mississippi Valley Type (MVT) with economic sphalerite – galena mineralisation hosted in high to moderate angle fault/fault breccia.

Widespread flat lying carbonate replacement by low grade Zn and Pb sulphides has been delineated by historic drilling at Earaheedy. The area of flat lying mineralisation is very significant (20km by 3.5km) indicating extensive metal input and is completely open along strike and down dip. The historic drilling is wide spaced and has not tested the zone within the carbonates overlying the main basement fault.

Previous work by Rumble has highlighted strong metal zonation Zn:Pb ratios paralleling the basement fault (refer to ASX Announcement 12/10/2017 – Option Agreement to acquire Earaheedy Zinc Project). Metal zonation is characteristic of MVT deposits in the Devonian Lennard Shelf of Western Australia and has proven to be a useful vector to aid in delineating high-grade faults mineralisation.

The exploration completed to date at the Earaheedy Project has shown similarities to the historical Pillara (Blendevale) Zn-Pb deposit located in the Lennard Shelf of Western Australia (previously mined by BHP and Billiton from 1987 at Cadjebut, continued by Western Metals until 2003 and Teck/Xstrata between 2006 and 2008). The Pillara deposit occurred over a strike of 2 km and was located 80 to 500m below surface. The geological resource was 20Mt @ 8.3% Zn, 2.5% Pb, 17ppm Ag (based on 3% cutoff)1. The deposit produced 10.3Mt @ 6.9% Zn and 2.3% Pb. Of note, the discovery drill-hole (8m @ 8.9% Zn, 3.5% Pb below 210m)1.

 

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