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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
  • Owners
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  • Mining
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  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Block caving
Processing
  • Gravity separation
  • Flotation
Latest NewsNewcrest to work with Jacobs on Cadia expansion     March 7, 2019


Owners

Source: p. 131
CompanyInterestOwnershipInvestor's Info
Newcrest Mining Ltd. 100 % Indirect

Deposit Type

  • Porphyry
  • Vein / narrow vein


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 a relatively small cap to the overall mineralized envelope and has a core of disseminated chalcopyrite (and rare bornite), capped by chalcopyrite-pyrite mineralization (Fox et al., 2009).

The upper zone mineralization is stratigraphically controlled within the volcaniclastic unit. This zone is transitional to the deeper vein style mineralization. The deeper zone is localized around a core of steeply dipping sheeted quartz-calcite-bornite-chalcopyritemolybdenite, with the highest gold grades associated with the bornite-bearing veins. Copper and molybdenite form a mineralized blanket above and to the east of the higher grade gold envelope.


Mining Methods

  • Block 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


Processing

  • Gravity separation
  • Flotation

Source: Subscription required

Summary:

Ore mined from the Cadia Valley deposits is treated in two operating process plants producing gold rich copper sulphide flotation concentrate for export, and gravity gold doré.


Combined production numbers are reported under Cadia Valley Operation


Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Probable 1,400 Mt Gold 0.47 g/t 21 M oz
Probable 1,400 Mt Copper 0.3 % 4.1 Mt
Probable 1,400 Mt Silver 0.78 g/t 34 M oz
Indicated 2,900 Mt Gold 0.36 g/t 34 M oz
Indicated 2,900 Mt Copper 0.26 % 7.6 Mt
Indicated 2,900 Mt Silver 0.68 g/t 64 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 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 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
Subscription required - Subscription is required.

News:

NewsDate
Newcrest to work with Jacobs on Cadia expansion March 7, 2019

Aerial view:

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