NE Tasmania – A Continuation of Victorian Western Lachlan Fold Belt
Gold deposits in North East Tasmania lie within a continuation of the Western Lachlan Fold Belt in Victoria – one of the world’s largest orogenic gold provinces.
The Western Lachlan Fold Belt in Victoria hosts the >3 MOz Fosterville Mine, Bendigo and other Tier 1 goldfields and has produced >80 MOz gold.
NE Tasmania hosts the Beaconsfield Mine (2.3 MOz), New Golden Gate Mine (0.3 MOz) and Lefroy Goldfield (0.2MOz), along with hundreds of smaller historic gold mines and occurrences.
While Victoria is currently experiencing intense gold exploration activity, NE Tasmania has had very little modern gold exploration undertaken.
Continuation of Western Lachlan Fold Belt from Victoria into NE Tasmania
Gold deposits in NE Tasmania share the same geological setting as their Victorian counterparts:
- Ordovician turbiditic meta-sediments (Mathinna Super-Group).
- Ordovician to Devonian deformation and metamorphism (Western Lachlan Orogen).
- Associated with nearby Devonian granitoid intrusives.
- Gold commonly in quartz veins occupying dilational zones along large- scale faults related to folding and deformation during the Lachlan Orogen.
- Predominantly NW oriented lodes controlled by regional structures and rheological contrasts between sedimentary units.
- Intrusion Related Gold System (IRSG) deposits also occur in NE Tasmania.
Timing of Geological Events in NE Tasmania vs Melbourne and Bendigo Zone of Western Lachlan Fold Belt in Victoria (after Bierlein et al, 2005)
NE Tasmania Exploration Licence Applications
Stellar has 12 first-in-time Exploration Licence Applications (ELAs) covering an area of 2,534 km2 in NE Tasmania which is highly prospective for Victorian-style and IRGS gold exploration and contains ~77 recorded historic gold occurrences and 25 recorded historic tin occurrences:
- 10 first-in-time ELAs were registered in September 2020 covering an area of 2,295 km2. These are expected to be granted by the end of June 2021.
- 2 first-in-time ELAs were registered in March 2021 covering an area of 240 km2. These are expected to be granted later in 2021.
Stellar ELA’s, NE Tasmania Geology and Mineral Occurrences
NE Tasmania Gold Exploration Targets
Numerous gold exploration targets have been identified within Stellar’s ELA’s areas based on the following targeting criteria:
- Ordovician turbiditic meta-sediments (Mathinna Super-Group)
- Ordovician to Devonian deformation and metamorphism (Western Lachlan Orogen)
- Devonian granitoid intrusives nearby
- Predominantly NW Regional scale structural trends/lineaments identified in aeromagnetic and gravity surveys and corresponding mapped faults. Intersecting NE trends/faults also identified in some of the ELA’s
- Intrusive Related Gold Style (IRSG) targets identified from aeromagnetic surveys on some ELA’s
- Location of recorded gold (and tin) occurrences
- Ground open for application
A number of desktop orogenic and IRGS gold exploration targets have already been identified using full GIS targeting capability developed by Stellar’s technical team including; recently reprocessed aeromagnetic, radiometric and gravity data, geology, recorded gold and tin occurrences, historic drilling and geochemical data. A summary of the gold exploration targets within each of Stellar’s 12 NE Tasmania ELA’s is shown in the table below.
Summary of Stellar NE Tasmania ELA Gold Targets
Proposed Exploration Program
NE Tasmania Gold Exploration Project – Proposed Work Program Summary