Australia

Cadia Hill Mine

Click for more information

Categories

Overview

Mine TypeStockpile
Commodities
  • Gold
  • Copper
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
ShapshotOperations at the Cadia Hill open pit ceased by 2014.

In December 2019, Cadia Holdings received approval from the New South Wales Department of Planning and Environment (NSW DPE) to fully utilise the decommissioned Cadia Hill mine pit for deposition of dewatered tailings. Now the pit has been used for tailings storage as a mined-out Cadia Hill open pit TSF.

Surface stockpiles from Cadia Hill containing approximately 0.3 Moz gold and 0.04 Mt of copper remain in Mineral Resource (As of 2023, it has remained unchanged since 2018).
Related AssetCadia Valley Operation

Owners

SourceSource
CompanyInterestOwnershipInvestor's Info
Newmont Corp. 100 % Indirect
Cadia Holdings Pty Ltd. (operator) 100 % Direct
Cadia is 100% owned by Newcrest through its wholly owned Subsidiary, Cadia Holdings Pty Ltd.

On November 6, 2023, Newmont Corporation completed the acquisition of Newcrest Mining Limited to create the world’s leading gold company with robust copper production.

Deposit type

  • Vein / narrow vein
  • Porphyry

Summary:

The Cadia Hill deposit is a sheeted quartz vein system located almost entirely within the quartz monzonite porphyry phase of the Cadia Intrusive Suite.

The predominant alteration is propylitic (chlorite-epidote) with narrow domains of structurally-controlled phyllic (sericitic) alteration. Mineralization is in part related to chlorite matrix hydrothermal breccias that cut the deposit. Unusually, compared to the other mineralized systems in the area, potassic alteration is confined to K-feldspar rich vein haloes and to some quartz veins.

The vein system forms a broad, 300 m wide tabular envelope that dips 60° to the southwest. Chalcopyrite with lesser bornite, pyrite and gold occur in the quartz veins and as disseminations throughout the intrusive wallrock.

Reserves

Lock

- subscription is required.

Mining Methods

Lock

- subscription is required.

Comminution

Crushers and Mills

Milling equipment has not been reported.

Summary:

Concentrator 1:

• Primary crushing in a 60-inch x 113-inch gyratory crusher. This was the main primary crusher for the original Cadia concentrator and now primarily used for surface stockpile reclaim;
• Coarse ore stockpile (COS) to a live capacity of 40,000 t and subsequent reclaim facilities;
• Distribution bin and double-deck vibrating screens for feed size preparation;
• Secondary crushing, treating screen oversize, using MP1000 cone crushers;
• High pressure grinding rolls (HPGR) unit treating screen undersize prior to the SAG mill;
• Primary open circuit milling in a single 40-ft SAG mill fitted with a 20 MW motor. The motor will be upgraded to 22 MW. Oversize pebbles from the SAG mill are returned to the distribution bin;
• Secondary milling in three ball mills, with the two original mills fitted with 8.7 MW motors, and a more recently installed third ball mill with a 16 MW motor. The mills are in closed circuit with cyclone classification for a target grind size of P80 of 150–190 µm.

Concentrator 2:

• Reclaim and conveying system to transfer ore from Concentrator 1 COS to Concentrator 2 facilities;
• Secondary and tertiary crushing using MP800 cone crushers and open circuit prescreening;
• Dedicated coarse (crushed) ore stockpile (COS) and apron feeder reclaim facilities;
• Primary open circuit milling in a single SAG mill fitted with a 7.5 MW motor;
• Secondary milling using a 7.5 MW ball mill and parallel Vertimill VTM1250, in closed circuit with classifying cyclones.
• Tertiary milling using a Vertimill VTM 3000.

Cadia’s operating and financial performance in FY22 was impacted by reduced throughput rates during the planned replacement and upgrade of the SAG mill motor which commenced in early July 2021 and was successfully completed in November 2021, together with the expected decline in grade.

Processing

Lock

- subscription is required.

Production

Combined production numbers are reported under Cadia Valley Operation

Production Costs

Commodity production costs have not been reported.

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Source Source
Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2024
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2024

Aerial view:

Lock

- subscription is required.