Aeris has a number of advanced projects in the Tritton region which are currently the subject of development studies with the intent on progressing each towards production. These include the the Avoca Tank and Budgery deposits and Murrawombie open pit expansion. Extension of the Tritton mine at depth and development of the Murrawombie underground project are in progress.
Murrawombie - Open Pit Extension: Pre-Feasibility Study completed
A modest expansion cut back of the Murrawombie open pit has been designed to mine an estimated 700 thousand tonne of sulphide ore. The open pit project targets ore which is not suitable for underground mining, so is complementary to the Murrawombie underground project. Mining of the pit expansion will assist with the final closure of the heap leach pads, saving on mine rehabilitation costs. The Murrawombie open pit expansion is currently scheduled to occur after the completion of the Murrawombie underground project.
Avoca Tank: Pre-Feasibility Study completed
Avoca Tank is in the far north of the Girilambone Complex. It is a high grade sulphide deposit with a defined Ore Reserve estimate and completed pre-feasibility study. Avoca Tank is planned to provide higher grade supplementary feed for the Tritton operations.
Avoca Tank copper mineralisation is associated with three stacked lenses hosted at the contact between an upper sequence of interlayered metasediments and a lower sequence of mafic volcanics. The mineralised lenses vary in size from 15m to 60m (strike), 130m to 360m (down dip) and 2m to 30m (true thickness).
It is located only 2.5km north-west of the current operating North East and larsens deposit, and the process leading to application of a Mining Lease is underway.
The deposit remains open at depth below 450m vertical. There is further opportunity for future depth extension when underground drilling platforms are available. Aeris remains confident in the likelihood of Avoca Tank type repeat discoveries, given the prospective geology in and around the northern end of the Girilambone Mafic Complex.
Environmental Impact Statement Documents
Budgery: Concept Study completed
The Budgery Deposit is part of the Budgery Complex and is located approximately 20km south of the Company’s processing plant by a sealed road. Significant drilling has already been conducted, sufficient to support a concept mining study for an open pit. Work is being undertaken to quantify what oxide material is capable of being treated through heap leaching to improve on already positive economics. A drill out of oxide material to a higher level of confidence has been planned. An updated Mineral Resource based on 2010 drilling will be used to progress the mining studies.
The current mineralised system is large and known to continue at depth. There is limited drilling at depth and this presents an opportunity to increase the Mineral Resource down dip from the current reported Mineral Resource, which extends 250m vertical.