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Australia
Cadia East Mine (Cadia Valley Operation)

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 Location:
22 km SW from Orange, New South Wales, Australia

  Address:
1460 Cadia Rd, Cadia
South Orange
New South Wales, Australia
2800
Phone  ...  Subscription required
Fax+61-02-6366-4333
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Copper
  • Silver
  • Molybdenum
Mining Method
  • Panel caving
Production Start...


Owners

Source: p. 17,171
CompanyInterestOwnershipInvestor's Info
Newcrest Mining Ltd. 100 % Indirect
Cadia Holdings Pty Ltd. (operator) 100 % Direct

Contractors

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Deposit Type

  • Vein / narrow vein
  • Porphyry


Summary:

The Cadia East deposit occupies a mineralized 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 orebody.

At Cadia East, sheeted quartz-calcite-bornite-chalcopyrite ± molybdenite veins, oriented sub-parallel to E-SE trending monzonite intrusions define a high grade resource at depth (Wilson, 2003). Pervasive biotite-orthoclase-albite-magnetite ± actinolite alteration envelopes surround these veins forming a zone of calc-potassic alteration. Propylitic (epidote-magnetite-hematite-chlorite) alteration extends laterally away from this calc-potassic core (Wilson, 2003). Distinctive hematite dusting of hydrothermal feldspars occurs throughout the propylitic alteration at Cadia East, a characteristic feature of many alkalic porphyry Au-Cu deposits (Holliday and Cooke, 2007).

The Cadia East mineralization consists of a package of steeply dipping, sheeted quartz veins forming a near vertical slab with dimensions approximately 2.5 km long, greater than 1.6 km deep and at least 200 m to 300 m wide. A high grade gold core is found at depth towards the eastern end of this vein package. Smaller pods of higher grade material are located above and lateral to the high-grade core.

Mineralization at Cadia East can be divided into two broad overlapping zones: an upper, copper rich disseminated zone and a deeper gold-rich zone associated with sheeted veins. The upper zone forms ........


Mining Methods

  • Panel caving


Summary:

Cadia East deposit is a large underground mining operation using the panel caving method (Cadia East Project). The deposit is mined in a number of lifts each comprising multiple panels.


Crushing and Grinding
Flow Sheet: Source

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

Flow Sheet: Subscription required

Summary:

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Combined production numbers are reported under Cadia Valley Operation


Reserves at June 30, 2022:
Mineral Resource Cut-Off Criteria: Cadia East Underground- Net Smelter Return (NSR) of approx. A$18.00/t milled.

Ore Reserve Cut-Off Criteria: Cadia East Underground - NSR of approx. A$22.11/t milled.

CategoryTonnage CommodityGradeContained Metal
Probable 1,200 M dmt Gold 0.42 g/t 16 M oz
Probable 1,200 M dmt Copper 0.29 % 3.5 Mt
Probable 1,200 M dmt Silver 0.7 g/t 27 M oz
Probable 1,200 M dmt Molybdenum 82 ppm 0.099 Mt
Indicated 2,600 M dmt Gold 0.35 g/t 30 M oz
Indicated 2,600 M dmt Copper 0.26 % 6.8 Mt
Indicated 2,600 M dmt Silver 0.65 g/t 55 M oz
Indicated 2,600 M dmt Molybdenum 66 ppm 0.17 Mt
Inferred 500 M dmt Gold 0.24 g/t 3.8 M oz
Inferred 500 M dmt Copper 0.17 % 0.85 Mt
Inferred 500 M dmt Silver 0.47 g/t 7.5 M oz
Inferred 500 M dmt Molybdenum 25 ppm 0.012 Mt



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2022
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Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Sustainability Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Year-end Mineral Reserves 2018
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2016
Fact Sheet 2015
Technical Report 2011
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