Six mineralisation styles are known in the Cadia district:
• Cadia Hill: Intrusion and volcanic-hosted, sheeted quartz vein mineralisation;
• Cadia East: Volcanic-hosted, disseminated and sheeted quartz vein mineralisation;
• Cadia Far East: Volcanic and intrusion hosted mainly sheeted quartz vein mineralisation;
• Cadia Quarry: intrusion hosted mainly sheeted quartz vein mineralisation;
• Ridgeway: intrusion and volcanic hosted quartz stockwork vein mineralisation;
• Big Cadia, Little Cadia: iron-rich skarns.
The Cadia East and Cadia Extended consist of alkalic porphyry gold-copper style mineralization and the Big Cadia deposit is a skarn-style occurrence.
The Cadia East–Far East deposit occupies a mineralised zone 2.5 km in strike length, 600 m in width and over 1,900 m in vertical extent. It is located below and to the east of the Cadia Hill deposit.
Geology
Mineralisation is developed in the FRV, and in a series of subvertical to steeply northdipping monzodioritic to quartz monzonitic dykes, that are termed the Cadia Far East intrusive complex (CFEIC). The syn-mineral nature of at least some of the intrusions is indicated by the presence of mineralised xenoliths within monzonite porphyry dykes that also host porphyry-style veining and alteration.
The Weemalla Formation has been intersected at depth, and consists of finely-bedded siltstone interbedded with basaltic volcanic rocks. Overlying th ........