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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
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Sub-level caving
Processing
  • Gravity separation
  • Flotation
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.
No change in Reserves or Resources has been made since 31 December 2017.


Owners

 
CompanyInterestOwnershipInvestor's Info
Newcrest Mining Ltd. 100 % Indirect

Deposit Type

  • Porphyry
  • Breccia pipe / Stockwork


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


Processing

  • Gravity separation
  • Flotation

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Summary:

The process plant comprises a crushing, grinding and flotation circuit to produce a gold rich copper concentrate. A gravity circuit recovers a proportion of the gold which is smelted on site to produce gold doré. A notable aspect of Concentrator One’s design is the use of high capacity equipment in a single processing line to minimise capital and operating costs.

Underground ore from Ridgeway is processed in Concentrator Two, which uses similar processes to the adjacent Concentrator One, with the major difference being the size of the facility, which is designed to treat lower volumes of higher grade ore.

The concentrates from both treatment plants are combined and pumped as slurry to a filtration plant where the concentrate is de-watered and transported by rail to Port Kembla for export.


Combined production numbers are reported under Cadia Valley Operation


Reserves at December 31, 2018:

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 Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Year-end Mineral Reserves 2017
Fact Sheet 2015
Technical Report 2011
Subscription required - Subscription is required.

Aerial view:

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