Robinsons – Browns (R-B) Zone, 2 km east of Costerfield (see Figure below). Costerfield Zone, near the crest of the dome, centred on the Costerfield township and hosting the major producing mines and deposits and.Western Zone, approximately 1.5 km west of Costerfield, on the western flank of the Costerfield Dome.Antimony Creek Zone, approximately 6.5 km southwest of Costerfield, on the outer western flank of the Costerfield Dome.Within the district, four north-northwest – trending zones of mineralization have been identified. The gold-antimony veins in the Costerfield district are hosted within the Silurian Costerfield Siltstone unit. The north-trending Heathcote-Mt William fault system marks the western boundary of the Melbourne Trough in the Costerfield area. At the base of the Supergroup is the Costerfield Formation, which is conformably overlain by the Wappentake (sandstone/siltstone) and Dargile (mudstone) Formations, the McIvor Sandstone and the Mount Ida Formation (sandstone/mudstone). These rocks form the Murrindindi Supergroup. Stratigraphy in this area comprises a thick sequence of Lower Silurian to Lower Devonian shelf and flysch sedimentary rocks, dominated by turbiditic siltstone, with minor sandstone and argillite. The Costerfield gold-antimony vein district, of which the Augusta Lodes are part, is located on the northern end of the Darraweit Guim Province. Gravity gold concentrate is sold to a refinery in Melbourne, Victoria, and gold-antimony flotation concentrate is trucked to the port of Melbourne and shipped to a smelter in China. The circuit includes primary mobile crusher, primary and secondary ball mills, rougher, scavenger, cleaner flotation, gravity circuit, and filtering. Costerfield is currently planning a second mine portal at Brunswick. Ore is trucked on the surface from the Augusta mine portal to the Brunswick processing plant, where it is stockpiled and blended into the processing circuit. The stopes are subsequently backfilled with cemented rock fill to supply stability, reduce dilution, and allow for mining above and below developed levels. Levels are then mined out on retreat with long hole stopes drilled to a minimum width of approximately 1.5 m. Level spacing is at 10 m centers and horizontal development is advanced in a minimum of 1.8 m wide drives in both directions of the deposit. Ore is accessed by a primary spiral ramp. The mining method employed is long-hole stoping with cemented rock fill. Mandalay Resources expects Youle to be the sole ore source by the third quarter of 2020. The Brunswick deposit is being mined in conjunction with the Youle deposit, which produced its first ore in August 2019. The Augusta mine has been operational since 2006 and was the sole ore source for the Brunswick processing plant until December 2013, when ore production started from the Cuffley deposit located approximately 500 m to the north of the Augusta mine workings. By 2013, through extensive improvements and investments in mining and processing methods, the processing plant's capacity was expanded to approximately 13,000 tonnes per month from 5,000. Purchased in 2009, Mandalay Resources immediately restarted capital development and mining. The Costerfield operation is located in Victoria, Australia, within the Costerfield mining district, approximately 10 km northeast of the town of Heathcote, Victoria.
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