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.
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.
|Location||Pilbara, Western Australia|
|Deposit Style||Remobilised hydrothermal Ni–Cu ± Ag ± PGE system|
|Key Attributes||High grade silver deposit partially mined with numerous Ag/Cu/Ni/PGE anomalies|
|Asset Stage||Resource update plus resource definition|
|Results||Pure silver intersection, average mine grade was 2,195 g/t Ag (70.24 Oz/t Ag)|
|Next Phase of Work||Review remaining resource potential, local and regional trenching and target generation|
From initial data review work it is apparent that there remains both underexplored resource potential within the existing ‘mine’ as well as an ‘open pit’ surface resource and extensions of the deeper mineralisation some of which has been partially mined to date and some of which has not been fully tested to date.
Initial review of historical records and technical reports by Alien confirms evidence of untested further high-grade mineralisation. Due to the abundance of native silver in the main mineralised system reported in historic reports and as evidence from the unique nuggets extracted to date and with single assays returning up to 30,000 g/t Ag (900 Oz/t Ag) it is evident that this deposit contained and still contains exceptional high-grade silver.
Alien has identified several significant priority exploration targets based on a combination of limited historic exploration on such targets, early-stage work outlining mineralisation but not having been followed up as well as simply no work having been carried out to date.
Alien’s Program of Works (“POW”) has been approved by the Western Australia Mines Department for initial trenching and drilling at the Elizabeth Hills Mining Licence. The POW covers up to 1.25 kilometre of trenching programs and 4,000m of drilling (RC and diamond drilling). Trenching programs to test for new or repeat silver orebody due south of existing deposit. Drilling program to target the historical resource area and to test for potential strike extensions. Field exploration is underway started in mid-December and will run for a number of months.
Alien acquired an aeromagnetic survey for Elizabeth Hill and the surrounding Munni Munni North tenement. Alien and Southern Geoscience Consultants (SGC) used this new data to identify numerous targets. The highest priority of these have been used in the planning of the initial trenching work.