Elizabeth Hill

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Project Overview

Elizabeth Hill is historically one of Australia’s highest grade silver mines and has produced over one million ounces at an average of 2,195 g/t Ag (70.24 Oz/t Ag) from an initial resource of just over four million ounces. The deposit was also unique for the exceptional native silver nuggets including, as previously reported, a single 180 Kg nugget. Mining ceased in 2000 due to a depressed silver price and a fall out between the JV partners East Coast Minerals and Legend Mining hence the remaining considerable untapped resource.

Limited sporadic exploration in the ML was done after mining ceased up to 2009 however numerous targets remain to be further tested to follow up on historical work as well as new targets not yet tested.

LOCAL GEOLOGY

The Elizabeth Hill Silver Project is situated approximately 45 km south of Karratha in the Achaean Pilbara Block of the Pilbara Craton. Grid power and groundwater are available on site, and the area has an abundant skilled workforce nearby.

The project area is located over the eastern part of the Munni Munni Intrusive Complex, at the contact of basement granites and the Munni Munni sequence. Localised geological controls on the Elizabeth Hill mineralisation appear to be a structurally controlled southerly plunging shoot, occurring along the eastern boundary of the Munni Munni fault. The Munni Munni fault is a major north-south regional structure with a horizontal displacement in excess of 500 m, along which the Elizabeth Hill Mineralisation has been intersected over only a 100 m north-south zone along the boundary of the fault. The area also hosts an ultramafic unit called the J Reef, a significant host of Ni-Cu-PGEs. VMS targets have also been identified within this mineral rich ML.  

ProjectElizabeth Hill
CommoditySilver, Nickel, Copper, PGE
LocationPilbara, Western Australia
Deposit StyleRemobilised hydrothermal Ni–Cu ± Ag ± PGE system
Key AttributesHigh grade silver deposit partially mined with numerous Ag/Cu/Ni/PGE anomalies
Asset StageResource update plus resource definition
Results– 9.7m @ 8,326 g/t Ag (267oz/t Ag) from 15m in drillhole 21EHDD003
– 24.8m @ 829 g/t Ag (27oz/t Ag) from 2m including 11.7m @ 1,735 g/t Ag (56oz/t Ag) and 1.7m @ 19,865g/t Ag (639oz/t Ag) from 23m, in drillhole 21EHDD001,
Historic average mine grade was 2,195 g/t Ag (70.24 Oz/t Ag)
Next Phase of WorkReview remaining resource potential, local and regional trenching and target generation
Deal PartnerAvailable
Deal TermsTBC

Exploration summary

DRILLING PROGRAMME Results

The drill program consisted of a total of 1,991 metres in 22 holes across the Project and the results below are from the 4 diamond drill holes completed for 211m from the first stage of the drilling program.

  • Exceptionally high silver grades have been returned from the Elizabeth Hill diamond drilling program with assays including:
    • 9.7m @ 8,326 g/t Ag (267oz/t Ag) from 15m in drillhole 21EHDD003; and,
    • 24.8m @ 829 g/t Ag (27oz/t Ag) from 2m including 11.7m @ 1,735 g/t Ag (56oz/t Ag) and 1.7m @ 19,865g/t Ag (639oz/t Ag) from 23m, in drillhole 21EHDD001
  • • Additionally, significant assay results for base metals have also been returned from the same intervals, these include:
    • 14.2m @ 0.18% Cu, 0.14% Ni, 0.36% Pb, 0.12% Zn and 140 g/t Co from 10.5m including 9.7m @ 0.18% Cu, 0.14% Ni, 0.27% Pb and 0.13% Zn in drillhole 21EHDD003; and,
    • o 24.8m @ 0.15% Cu, 0.11% Ni, 0.3% Pb, 0.22% Zn and 222 g/t Co from 2m in drillhole 21EHDD001
  • Interpretation of these diamond core results suggest the mineralised envelope at Elizabeth Hill may be larger than work by previous explorers has suggested
  • This mineralisation starts at surface in highly weathered, soft and easily extractable material

Schematic Cross Section of results from Elizabeth Hill orebody drilling, April 2022
Native silver with associated copper (green) in drill core, drillhole EHDD003, 16.5m depth, Elizabeth Hill, September 2021
Abundant sulphide in veins, clasts and disseminated throughout the core, EHDD004, 87m, Elizabeth Hill, September 2021
Birds eye view of drill rig set up, Elizabeth Hill, September 2021

Reopening of Mine

In January 2021, Alien commenced plans to reopen the original mine site.

Alien has purchased mining headframe, machinery and equipment to re-open and access the historic Elizabeth Hill silver mine after over 20 years of the mine lying dormant. The previous owner produced over 1m oz silver with exceptional grades of 2,195 g/t (70/oz t). Re-opening of the existing underground workings will provide access to the unmined orebody in the workings as well as enable detailed mapping and sampling of the orebody to better understand potential extensions. It will also enable an opportunity to update the silver resource directly from underground, as well as enabling a significant opportunity to expedite drilling of the polymetallic mineralised halo also from underground. This will also include the establishment of an on-site camp.

As a critical part of the development of this project, Alien are very fortunate to have the original miner who carried out the underground development engaged to open up the historic mine. Having been untouched for over 20 years, the initial work needed will be to dewater the mine and then to re-establish the dewatering system that was already in place via the existing steel lined water bores located just northeast of the main shaft. A substantial head frame will then be installed over the main shaft to facilitate safe and approved access via a cable system to underground. Once in place, the cleaning and making safe of the underground workings will be possible. Work has commenced to get the equipment to site and installed and it is hoped that this will be completed and a safe and open underground access by the end of Q1 2022.

First Head Frame erected over vent shaft, Elizabeth Hill

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