The Golden Mile deposit occurs in the Kalgoorlie Terrane within the southern portion of the NNW trending Archaean Norseman-Wiluna Greenstone Belt. The greenstone belt has been multiply deformed and regionally metamorphosed to grades varying from lower greenschist to amphibolite grade.

The stratigraphy covered by the Fimiston Project tenements consists of a basal ultramafic unit called the Hannan Lake Serpentinite. This ultramafic unit is overlain successively by the high magnesian Devon Consols Basalt, Kapai Slate, tholeiitic Paringa Basalt and the Black Flag sediments. Differentiated zones of dolerite and gabbro texture occur within the mafic sequence. The Golden Mile Dolerite, hosting the bulk of the Golden Mile and Mount Charlotte gold mineralisation, is a strongly differentiated layered gabbro, approximately 700m in thickness. The Golden Mile Dolerite is situated conformably between the Paringa Basalt and the Black Flag sediments. This entire stratigraphic sequence is intruded by numerous porphyry dykes of intermediate to felsic composition.

The Fimiston style gold mineralisation, which accounts for the bulk of the economic gold ore of the Golden Mile deposit, is hosted dominantly in the Golden Mile Dolerite with lesser mineralisation hosted in the Paringa Basalt. The Golden Mile deposit is an intensely mineralised Archaean shear zone system developed between the Adelaide and Golden Pike faults. Gold mineralisation occurs over a north-south strike length of 4,250m, a width of 1,850m and has been historically mined to a depth of about 1,200m underground.

The mineralisation consists of numerous narrow, generally 1-2m wide, but locally up to 20m wide, vertically and laterally extensive lodes, up to 1,200m vertical and over 1,000m along strike length. The Fimiston lodes occur in three principle orientations: Main 140o/80oW, Caunter 115o/55oW to 80oW and Cross Lodes 050o/90o to 80oN-S. The deposit lies within a regional syncline and is divided into the Eastern Lode System and the Western Lode System, divided by the steeply dipping reverse Golden Mile Fault. The Main and Caunter lodes are the dominant sets in both the Western and Eastern Lode Systems. The lodes in the Western Lode System display good lateral and vertical continuity whereas lodes in the Eastern Lode System are segmented by numerous steep reverse faults. The lodes in the Western and Eastern Lode System form a funnel shaped array which is sub-vertical in the Western Lode System and steeply west dipping in the Eastern Lode System.

The Mt Charlotte style gold mineralisation accounts for the bulk of the economic gold ore of the Mt Charlotte deposit, but may be seen in some areas of Fimiston Pit. It is predominantly associated with pyrite in carbonate alteration haloes around quartz veins with a minor proportion as relatively coarse free gold within the veins, commonly close to their margins. The veins vary in width from a few millimetres to a maximum of about 2 metres but are commonly between 2 cm and 50 cm wide. The vein spacing varies from 20 cm to tens of metres but is typically from 50 cm to 2 metres in areas mined as ore. Quartz is the dominant vein-fill mineral; accessory vein minerals include calcite, ankerite, scheelite, pyrite, pyrrhotite, and gold.

The Hidden Secret style gold mineralisation is hosted within the Williamstown Dolerite at the contact with the Kapai Slate and Devon Consols Basalt and spatially associated with a porphyritic intrusion and the Towns Fault. Gold is hosted in deformed a quartz vein 2- 20cm wide. Vein minerals include pyrite, telluride, silica, carbonate and fuchsite.

Multiple drill programs were completed in FY2020 across various project areas at Mt Charlotte. Results are encouraging with more drilling planned in FY2021 as the full scale of the mineralised system and how it interacts with Fimiston is being modelled and tested.

Mt Ferrum is a shear-hosted Fimiston-style lode located 600m east of the Sam Pearce decline of the Mt Charlotte mine. Mineralisation is hosted within Paringa Basalt and strikes NNE. Infill resource definition drilling has identified a series of hangingwall and footwall structures, and stockwork mineralisation in Williamstown Dolerite to the west of the main lode. Mineralisation is thought to be controlled by the structural architecture and is the subject of a geological review currently underway.

Kal East is a narrow, high-grade Fimiston-style lode lying 250m to the east of existing infrastructure at the Mt Charlotte mine. Infill resource definition drilling has identified more complexity than expected, defining a series of hangingwall and footwall structures. Mineralisation is hosted primarily within Williamstown Dolerite and the highest grade is constrained within a steeply dipping southerly plunging shoot. Internal zones within the Williamstown Dolerite are important in controlling the distribution of gold.

Belgravia is a series of mineralised lodes lying 100m north of existing infrastructure at the Mt Charlotte mine. Mineralisation is hosted within pillowed and variolitic Devon Consols Basalt in proximity to the Hannans Lake Serpentinite, the contact of which is intruded by felsic porphyritic rocks. Infill resource definition drilling has identified eight separate NNW- striking lodes with en échelon geometry. The lodes are overprinted by stockwork mineralisation, with veins dipping to the north similar to the Mt Charlotte-style stockwork orientations.

The selected mining method for the Fimiston Open Pit is a bench mining open pit method. The proposed open pit cutbacks will be mined using conventional open pit mining methods (drill, blast, load and haul) under an owner operator model, utilising 800t class excavators and 240t class trucks. This method is consistent with the current and historic mining method of the Fimiston Open Pit and is deemed appropriate given the proposed cutbacks are an extension of the current Fimiston Open Pit.

The shovels and trucks is moving the ore and waste rock from the Pit floor to the next step in the gold recovery process – the Primary Crusher. The WENCO Production Monitoring Control System coordinates the dig plan of the blast with the schedule supplied by the mining planners in the Mine Technical Services Department to create an operating manual for the Pit for that day.

Ausdrill provides a custom manufactured machine for Production and Ancillary Services on site (The Rock Commander 330 / and the 350 Longreach) which is designed around an excavator track based frame to enable reach and flexibility whilst providing a highly efficient way to access drill and aide in the mining sequence in the pit famous for large stopes and underground networks.

The new Fimiston open pit production profile (100% in JORC compliant Reserves) consists of several large mining areas, aiming to consistently maximise fleet productivity: Oroya Brownhill, Fimiston South Stage 1, Golden Pike South, Fimiston South Stage 2, Golden Pike North.

Fimiston South, located at the southern end of the Super Pit, will be KCGM’s single largest cutback in a decade, with a ~10:1 strip ratio (including Inferred Resource ^ material) and ~850Mt total material movement.

A two stage, 12 year mine life is planned. Stage 1 will commence in the second half of FY21, and Stage 2 will commence in FY23. Stage 1 has received full regulatory approval from the relevant government authorities, whilst the application for Stage 2 has been submitted for approval.

Golden Pike is a priority mining front, due to high grades (Reserves 25Mt @ 2.0g/t) and low strip ratio (average 2.9:1). Although this is the deepest open pit working area at ~600m below surface, it benefits from the investment made by previous owners. The waste pre-stripping at Golden Pike has been completed in the preceding ~10 years.

Mining continues at the Golden Pike South cutback, whilst the Golden Pike North cutback will commence in FY24, once the East Wall. The new plan has Golden Pike South finishing in FY24 (previously FY21) and Golden Pike North being mined from FY24 to FY29 (previously FY24 to FY26).

Mining of the Oroya Brownhill (OBH) cutback commenced in March 2020, following a comprehensive review of various east wall remediation strategies for the May 2018 slip. Eight years of mining is currently planned in two stages, with an average strip ratio of 9.0:1 (including pre-strip) at an average grade of 1.5g/t.

Mt Charlotte Underground Mine
The main historical method of mining at Mt Charlotte was open stoping. Typically, large stable open stopes were mined and then the rib/crown pillars were mass blasted, with waste rock fill above cascading onto the broken ore.

The Mount Charlotte underground mine is accessed via a portal Sam Pearce decline within the Fimiston Open Pit. Production in Mount Charlotte is carried out utilising a combination of remnant Sublevel caving, modified Avoca and conventional longhole open stoping. Where possible, stopes are backfilled with development waste to save haulage costs.

Currently stoping under rock fill (SURF) is used to recover remnant resources. Extraction is from drawpoints until waste rock dilution becomes excessive. Ore from Mt Charlotte is transported to the Fimiston Plant via the Sam Pearce Decline. The underground stopes are backfilled with either mine waste or crushed rock for stability purposes. Fill is delivered through the Glory Hole. Development of the Hidden Secret deposit located 400m east of Mt Charlotte commenced during 2016. Planned stope extraction will utilise the modified Avoca method.

Overland Conveyor
A conveyor previously used to transport ore has been reversed and is now used to convey waste rock from the Fimiston Operational Area to the Glory Hole for underground fill. The conveyor passes under Boorara Road and over Williamstown Road. An unsealed access road is in place along the length of the conveyor.

The Mt Charlotte Underground Mine currently produces ore at the rate of 1.15M tonnes per annum (tpa) which is transported directly to the ROM at the Fimiston Plant via the Sam Pearce decline located within the Fimiston Open Pit north eastern wall. Waste rock produced during mining at Mt Charlotte is not brought to the surface, instead it is used to backfill underground voids. Small volumes of waste rock from the Fimiston Open Pit are crushed at Fimiston before being conveyed to the ‘Glory Hole’ Pit to be used for backfilling of underground stopes at Mt Charlotte.

The ore from the Fimiston Open Pit and Mt Charlotte Underground Mine is processed at KCGM’s Fimiston and Gidji Processing Plants. The Fimiston and Gidji Processing Plants were commissioned in 1989.

The Fimiston Processing Plant operates in accordance with Prescribed Premises Licence L6420/1988/14 with an approved production capacity of 14,500,000 tonnes per year, whilst the Gidji Gold Processing Plant operates in accordance with Prescribed Premises Licence L5946/1988/13 with an approved production capacity of 438,000 tonnes per year.

The Crushing Services International (now CSI Mining Services) team crush raw material mined from Mt Charlotte and the open pit, where it then heads to the processing plant, or as waste to the Glory Hole. The team also supplies stemming material for the Blast Crew to use when backfilling blast holes and road base to sheet mine roads.

The Crushing Facilities and Stockpiles consist of contractor owned ‘secondary’ crushing fac ........