The Gloster gold deposit is hosted in an oxidised quartz diorite intrusive unit intruding a sequence of felsic to intermediate volcaniclastic units. The majority of the gold mineralisation is hosted in a sequence of flat 30° to 40° northeast dipping narrow quartz veins and fractures that are best developed within the more brittle quartz diorite intrusive unit. The quartz veins are stacked and extend from the surface to at least 100m depth. Weathering extends to a vertical depth of up to 100m. Within the weathered profile gold mineralisation has been localised by supergene enrichment processes and may not necessarily be closely associated with the quartz veins.

In the fresh rock zone the gold is typically associated with quartz-carbonate-sericite- chloritepyrite mineralisation. A zone of gold depletion occurs in the top 20m of the regolith above the gold resource which includes a 5m- thick zone of transported alluvium and colluvium. White and red to brown clays dominate the upper oxidised profile down to the base of complete oxidation.

The mining method assumed in the Ore Reserve study is the same as that currently employed at the Gloster Gold Mine, which utilises drill and blast, excavator and truck open pit mining. The existing pit has been designed to be developed in a series of progressive cutbacks.

Geotechnical and hydrogeological recommendations have been applied during pit optimisation and incorporated in design with ongoing reviews. Mining dilution and ore loss factors have been dealt with in the estimation of the OK Mineral Resource. This is considered consistent with the current reconciliation to production, the style of estimation and experience from Regis’ other Duketon operations which use the same estimation approach, and is consistent with the suitability of earthmoving equipment to the orebody type (moderate grade and wide mineralised zones).

A site visit was made by the Competent Person to the Gloster deposit in April 2017. Discussions were held with Regis personnel on aspects of possible slope stability, pit dewatering, temporary ramps, waste dumping and other issues relating to the estimation of Ore Reserves. Further work in the area of slope stability was carried out after these visits and the results incorporated both in the resource model, the optimisation and design of the reserve pit.

The existing Moolart Well CIL Processing facility will be utilised to treat the Ore Reserve and a recovery factor of 93% has been assumed in the estimation of the Ore Reserve.

Full feasibility level metallurgical testwork was completed on the original Gloster Mineral Resource. Metallurgical performance of the Gloster ore through the Moolart Well processing facility validates the chosen recovery factor for the Ore Reserve estimation.

The Gloster Gold Mine is a fully operational open pit mining operation. This Ore Reserve has been investigated based on being satellite ore feed for the Moolart Well processing plant. The processing parameters are based on actual costs of the existing Moolart Well processing plant and reagent consumption.