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Australia
Ridgeway 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
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Fax+61-02-6366-4333
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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Sub-level caving
Production Start...
The mine was placed into care and maintenance in March 2016 with minor production resumed during 2017 to supplement plant feed following the Cadia East seismic event in April 2017.
Ridgeway is currently on care and maintenance subject to further studies, all necessary approvals, permits, internal and regulatory requirements and further works.


Owners

Source: p. 171
CompanyInterestOwnershipInvestor's Info
Newcrest Mining Ltd. 100 % Indirect

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Porphyry


Summary:

The Ridgeway deposit is a higher grade Au-rich alkalic porphyry deposit. Copper-gold bearing quartz veins are centered on small (50-100 m diameter) multiphase monzonitic ‘pencil’ porphyries and hosted in an Ordovician volcano sedimentary succession. The known vertical extent of the mineralized system is 1,100 m, with the top of the ore zone located 500 m below the present day surface. The deposit remains open at depth.

Mineralization at Ridgeway and Ridgeway Deeps occurs in dense quartz vein stockworks and sheeted arrays localized in and around a small (50 m to 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.


Mining Methods

  • Sub-level caving


Summary:

Underground mining of the Ridgeway deposit commenced in 2002, with ore being supplied to the new 4 Mtpa Ridgeway concentrator adjacent to the Cadia concentrator. The upper portion of the Ridgeway deposit has been mined using sub-level caving (SLC).


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 December 31, 2018:
No change in Ore Reserves or Mineral Resources has been made since 31 December 2018.

Cut-Off Assumptions: Mineral Resource NSR of A$12.50/t milled; Ore Reserve NSR of A$22.40/t milled.

CategoryTonnage CommodityGradeContained Metal
Probable 80 Mt Gold 0.54 g/t 1.4 M oz
Probable 80 Mt Copper 0.28 % 0.23 Mt
Probable 80 Mt Silver 0.66 g/t 1.7 M oz
Indicated 110 Mt Gold 0.57 g/t 1.9 M oz
Indicated 110 Mt Copper 0.3 % 0.31 Mt
Indicated 110 Mt Silver 0.74 g/t 2.5 M oz
Inferred 41 Mt Gold 0.38 g/t 0.5 M oz
Inferred 41 Mt Copper 0.4 % 0.17 Mt
Inferred 41 Mt Silver 0.43 g/t 0.56 M oz



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 24, 2022
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Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2019
Annual Report 2018
Year-end Mineral Reserves 2018
Year-end Mineral Reserves 2017
Fact Sheet 2015
Technical Report 2011
Annual Report 35
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