Summary

Mine Type	Underground
Status	Care and Maintenance
Commodities	Gold Copper Silver
Mining Method	Block caving Sub-level caving
Production Start	...
Mine Life	...
Snapshot	The Ridgeway underground mine was developed shortly afterwards and commenced production in 2002, with Ridgeway expanding into block cave mining in 2009 (Ridgeway Deeps). Active mining ceased at Ridgeway in September 2017 and this mining area is currently under care and maintenance, however mining is proposed to recommence in Ridgeway Cadia Continued Operations Project With confirmed mineable resources extending well beyond the 30 June 2031 life of the current Project Approval, Cadia has commenced planning for the continuation of mining operations. This continuation of mining operations project is known as the Cadia Continued Operations Project (CCOP). The CCOP proposes to extend existing operations beyond 2031 through using the existing infrastructure and supporting services in combination with the continuation of underground mining within both the Cadia East Underground Mine (Cadia East) and Ridgeway Underground Mine (Ridgeway) mining areas.

Deposit type

• Breccia pipe / Stockwork
• Porphyry
• Vein / narrow vein

Summary:

The Ridgeway deposits are considered to be examples of alkalic porphyry gold copper-style mineralization.

The deposit is a subvertical body of quartz-sulfide vein stockwork mineralization with an elliptical, pipe-like geometry, elongated along a northwest-striking axis. Stockwork dimensions are approximately 400 m east-west, 250 m north-south and the deposit extends to a depth in excess of 1,000 m.

The top of the Ridgeway deposit is about 500 m below the surface and has approximate dimensions of 450 m east-west, 250 m north-south and extends about 1,000 m below the surface.

Mineralization at Ridgeway and Ridgeway Deeps occurs in dense quartz vein stockworks and sheeted arrays localized in and around the small <50-100 m diameter) composite diorite to quartz-monzonite intrusive complex. The most strongly developed quartz stockwork veining and alteration, and the highest copper and gold grades, occur immediately adjacent to the monzonite.

The frequency of the veins and intensity of alteration decreases away from the intrusive complex margin (Wilson et at., 2003). Ore minerals include bornite and chalcopyrite with lesser covellite and gold and occur in veins and as disseminations (Wilson et al., 2003).

Sulfide minerals are zoned from a bomite to chalcopyrite (plus gold) core, outwards and upwards through a chalcopyrite-rich to an outer pyrite-rich domain.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Commodity Production

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		May 13, 2025
.......................	.......................		May 13, 2025