Cadia Continued Operations Project

Frequently asked questions

CCOP (general)

The Cadia site has sufficient mineable resources to provide for many decades of mining, however, government mining approvals are always issued for a defined period and need to be extended to allow ongoing mining. Newcrest would like to continue our operations at Cadia beyond our existing Project Approval of 2031 and to have the opportunity to mine and process the identified ore reserves.

Cadia produces gold doré from a gravity circuit and gold-rich copper concentrates from a flotation circuit at Cadia. The concentrates are piped to a dewatering plant in Blayney, with concentrates piped to a dewatering plant in Blayney, which are then sent by rail to Port Kembla (NSW) for export.

Gold and copper are essential minerals to many innovative technologies around the world — such as smart and renewable energy, aquaculture and electric cars, as well as in industries such as construction, medicine, electronics and manufacturing.

New TSF

TSFs are purposely designed and engineered containment structures used to store the resulting material (known as tailings) from finely-ground processed ore bearing rock that was mined and has been through several sizing, grinding, and processing steps to produce gold doré and copper concentrate product. These tailings are discharged as dense slurry into the TSF.

Modern gold and copper processes seek to maximise the extraction of economic minerals, chemicals and reagents before the tailings are deposited. As such, Cadia does not use cyanide in any stage of processing.

Cadia currently has three Tailings Storage Facilities – the Northern Tailings Storage Facility (NTSF), Southern Tailings Storage Facility (STSF) and the Cadia Hill Pit Tailings Storage Facility (PTSF). Ongoing development of the mineral resource at Cadia will require additional infrastructure, which includes an additional TSF to replace these existing facilities which do not have sufficient capacity to provide for mining beyond current approvals.

This Conceptual TSF4 Study Area has been identified for the general location in which the proposed TSF could be constructed. The Study Area is larger than what which actually be required for the proposed TSF and associated infrastructure, however, this area is subject to further investigation to determine the appropriate location and of the proposed TSF. This area will be refined throughout the assessment process.

New water storage facility

Cadia sources its water from diverse sources, including from site rainfall runoff, treated effluent water from Orange City Council and local creeks and rivers under water licence allocations. Water stewardship is a high priority for Cadia and we regularly look at ways to source, manage and secure our water supply for our operations in a way that minimises the impact to other users, local communities and the environment. As part of this, Cadia is assessing options associated with another water storage facility (a water storage facility and associated infrastructure) to provide additional water security for the continued operations.

The design of the proposed Water Storage Facility is currently under investigation and there are multiple options being investigated. This Conceptual Water Storage Facility Study Area is the general area we are investigating for a water storage facility. The in which the proposed TSF could be constructed. The Study Area is larger than what which actually be required for the proposed TSF and associated infrastructure, however, this area is subject to further investigation to determine the appropriate location and of the proposed TSF. This area will be refined throughout the assessment process.

New subsidence zone

Cadia uses an underground mining method called panel caving, which is a bulk mining method requiring ore and rock to fracture under controlled actions. This underground mining causes caving and subsidence of the of overlying host rock which in turn causes changes on the surface above the underground mining area.

A schematic of the panel caving method is shown below.

Subsidence associated with this period of mining is being assessed through a review of the subsidence model against the proposed mine plans. As this becomes available, we will update our information on this webpage.