The project area lies within the Woods Point Walhalla Synclinorium structural domain of the Melbourne Zone, a northwest trending belt of tightly folded Early Devonian Walhalla Group sandy turbidites. The domain is bounded by the Enoch’s Point and Howe’s Creek Faults, both possible detachment-related splay structures that may have controlled the intrusion of the Woods Point Dyke Swarm and provided the conduits for gold bearing hydrothermal fluids.

Most gold mineralisation in the Woods Point to Gaffney’s Creek corridor occurs as structurally controlled shear-zone hosted dilational breccias and stringer quartz vein systems hosted by dioritic dyke bulges. The A1 Mine is central to this corridor, with gold mineralisation contained within the steeply dipping main southern diorite dyke bulge and a smaller northern diorite dyke. The dyke is cut and offset by a series of mainly reverse faults which host most of the gold mineralisation.

Gold is associated with intense quartz-ankerite-muscovite-sulphide wall rock alteration around dilational breccia veins with branching quartz-sulphidic stringer veins or narrow veins within reverse fault systems hosted by the dyke or where fault offsets show the dyke contact on one vein wall and metasedimentary rocks on the other. Wide zones of quartz stinger veins and carbonate-sulphide altered wall rock are more amenable to bulk mining techniques.

After 6 years of mine decline development, gold production commenced at the A1 Gold Mine in March 2016. The mining method is predominantly mechanised long hole stoping of bulk mining resources supplemented by hand held air leg mining of high grade narrow vein shear zones. Full scale production commenced in September 2016 from the 8352 longhole stope (Figure 4), defined during 2015/16, representing a major milestone for the Company since its ASX listing in 2012. Approximately 85,000 wet tonnes of ore was mined from the 8352 stope during 2016/17.

Ore mined from the A1 Gold Mine is trucked to the Company's fully permitted and operations processing facility at Porcupine Flat, near Maldon (Porcupine Flat Processing Plant):

- 130,000 - 150,000 tpa CIP gold processing facility with additional crushing capacity.
- Permitted and Operational:
- Generally operating to expectations;
- Adding crushing capacity to achieve +160ktpa.
- Additional 3 year tailings capacity already permitted.
- Fresh water supply from mine.
- State Grid Power.
- Main Road Access.
- Viable cartage distance to all of Centennials deposits.