The Tomingley gold deposits are interpreted as orogenic gold systems positioned within a major structural zone. This style of deposit is well documented globally with the more significant example in Australia being the Archean greenstone belts of the Yilgarn Craton in WA.

Roswell
The Roswell deposit is hosted in the Mingelo Volcanic Formation, a strongly deformed and hydrothermally altered Ordovician aged belt of volcanics that are predominantly andesitic volcaniclastic breccias, lesser sandstone/siltstone units, lavas and black mudstones. The volcanics are overlain by the younger Cotton Formation siltstones.

The mineralisation at Roswell is primarily hosted by two ‘brittle’ volcanic units (monzodiorite and andesite) as per the structural setting observed at the Tomingley gold deposits. These volcanics host structural zones generated by a competency contrast between the ‘brittle’ volcanics and ‘ductile’ volcaniclastic sediments.

Mineralisation is characterised as similar to the Tomingley gold mineralisation, with quartz carbonatepyrite-arsenopyrite veins hosted in phyllic altered volcanics. These sheeted quartz veins are orientated as steep east dipping, striking approximately 10o east of north, and are typically constrained within the volcanic units. The mineralisation has been defined by drilling over a strike length of approximately 600 metres and remains open to the north and at depth. The higher grade mineralisation occurs in the s ........

Underground Mining
In May 2020 the NSW Government Resources Regulator granted approval for the development of an exploration drive from the existing underground Wyoming One operation to the Roswell deposit.

The underground mine plan prepared for the Roswell deposit utilises this drive to enable the extraction of ore prior to the completion of the Roswell Open Cut. The exploration drive extends into the upper half of the currently planned stoping area, and will enable both upwards and downwards development. There is the possibility that in time the Roswell decline may daylight into the Roswell open cut pit ramp, although this is currently not scheduled until 2027 – 2029, assuming the Roswell underground extends at depth.

Stoping configurations are predominantly single-lift stoping (25m vertical interval) with strike length of 20-25m. The stoping method involves establishing a slot using conventional long-hole drill and blast techniques and then the primary stopes mined in a checker board pattern retreated along strike to the central access. The primary stopes are paste-filled and then the secondary stopes are accessed by mining through the paste-filled primary stopes. The secondary stopes are then mined, being left unfilled. The installation of brow cables and the use of a concurrent strike-retreat blasting sequence, and use of paste fill, will assist in controlling ground stability.

Ore production is scheduled to be 840 ktpa which would ........

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