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Australia
Dalgaranga Mine

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 Location:
70 km NW from Mt Magnet, Western Australia, Australia

  Regional Office:
Level 1, 41-47 Colin Street
PO Box 1449
West Perth
Western Australia, Australia
6005
Phone  ...  Subscription required
Fax+61 8 9481 0411
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life6 years (as of Jan 1, 2016)
The gold miner poured first gold at Dalgaranga in May 2018.
Latest NewsNRW commits to Gascoyne raising for Dalgaranga project     April 1, 2019


Owners & OPERATOR

 
CompanyInterestOwnership
NRW Holdings (operator)
Gascoyne Resources Ltd. 100 % Direct
NRW has been awarded a 72 month mining contract commencing 1 March 2018. The total value of the contract is over $300 million, with mining taking place at Gilbey’s Golden Wing and Sly Fox Open Pits.

Deposit Type

  • Porphyry


Summary:

The project is located in the Dalgaranga Greenstone Belt in the Murchison Province of Western Australia. The North-East trending belt consists of high magnesium basalt, tholeiitic basalt, intermediate volcanic, felsic intrusive porphyry, and a volcano-sedimentary sequence dominated by black shale and volcaniclastic lithologies. The Greenstone sequence is intruded by large gabbro complexes in the north (Mt Farmer, Mt Charles) and to the west (Dalgaranga Hill). The stratigraphy has been folded into two regional synforms which plunge in opposite directions separated by a regional fault/shear along the western side of the Mt Farmer gabbro sill. The Dalgaranga Greenstone Belt is intruded by a number of post tectonic granites separated by zones of amphibolite and mafic schists intruded by pegmatites.

The main body of mineralisation is hosted by a porphyry - shale / volcaniclastic package and varies from 20 to 110 metres in width. A combined thickness of the main zone and parallel mineralised zones is up to 200m wide. The style of mineralisation at Gilbeys is a quartz pyritecarbonate veined ductile shear system.

The major control on mineralisation at Gilbeys is structure. A major ductile shear hosts the mineralisation, with the ore grade material developing as consistently wide sub parallel lodes in the areas of strongest shearing. A flat and late vein stage is visible in the footwall and ore-zone, these quartz + sulphide veins appear to be variably mineralised.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The operation is made up of two open pits; a single staged pit at Golden Wings and a two staged cutback of the existing Gilbeys pit, and a mining schedule developed to allow the process plant to process at the design capacity of 2.5Mtpa.


Processing Technologies

  • Gravity separation
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)


Summary:

For extractive recovery testwork, samples were ground to 90µm and subjected to gravity separation followed by cyanide leaching. The porphyry samples were subjected to a timed direct cyanide leach and the shale samples were subjected to a 20 hour CIL leach. The RC composite samples from Gilbeys and Golden Wings were also subjected to a 20 hour CIL leach. The CIL leaches were utilised due to the presence of organic carbon in the samples and the 20 hour was based on the proposed plant residence time being 19 hours.

Significant amounts of gravity gold are present in all samples and gold leaching kinetics are very fast with the majority of leaching complete at 12 hours. Gravity gold recoveries at 90 µm grind from Gilbeys core samples ranged from 29.6% to 45.9%. Gravity gold recoveries from Golden Wings RC samples ranged from 26.7% to 71.1% at 90µm grinds. A conservative gravity recovery of 30% was utilised for FS design purposes.

The gold recoveries used for optimisation and financial modelling purposes are shown below.The recent testwork shows recoveries generally ranging from 91.1% to 93% for Gilbeys, and a consistent +96% for Golden Wings, dependant in location and material type, the fresh shale ore, which represents a small component (<10%) of the material in the mine plan has a lower recovery of 77%.

The process flow diagrams (PFD) for the Dalgaranga Feasibility Study (FS) have been developed from the process design criteria (PDC) prepared by Mintrex. The plant design proposed is simple but robust and broadly comprises the following:

• Primary Crushing;
• Crushed Ore Stockpile;
• Grinding and Classification;
• Gravity Recovery;
• Leaching and Adsorption;
• Elution and Electrowinning; and,
• Smelting.

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 91.3
Gold Head Grade, g/t  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityUnitsLOM (Projected)
Gold oz 541,000

Operational Metrics:

Metrics
Stripping / waste ratio 7 *
Waste tonnes, LOM 99,986 kt *
Ore tonnes mined, LOM 14,104 kt *
Total tonnes mined, LOM 113,090 kt *
Annual processing capacity 2.5 Mt *
* According to 2016 study.

Reserves at December 31, 2016:

CategoryTonnage CommodityGradeContained Metal
Proven 3.1 Mt Gold 1.28 g/t 129,000 oz
Probable 10.2 Mt Gold 1.3 g/t 423,500 oz
Measured 2.9 Mt Gold 1.41 g/t 133,000 oz
Indicated 13.4 Mt Gold 1.33 g/t 574,000 oz
Inferred 9.3 Mt Gold 1.4 g/t 408,000 oz

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required *
C1 cash costs Gold AUD  ......  Subscription required *
Assumed price Gold USD  ......  Subscription required *
* According to 2016 study / presentation.

Operating Costs:

Units2016
OP mining costs ($/t mined) AUD 19 *
Processing costs ($/t milled) AUD  ......  Subscription required
Total operating costs ($/t milled) AUD  ......  Subscription required
* According to 2016 study.
Subscription required - 'Investor' subscription is required.

2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscription required
OP OpEx $M AUD 268
Processing OpEx $M AUD 168
Total OpEx $M AUD  ......  Subscription required
Net revenue (LOM) $M AUD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - 'Investor' subscription is required.

Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 15, 2019
....................... Subscription required ....................... Subscription required Subscription required Oct 15, 2019
....................... Subscription required ....................... Subscription required Subscription required Oct 15, 2019
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2016
Subscription required - Subscription is required.

News:

NewsDate
NRW commits to Gascoyne raising for Dalgaranga project April 1, 2019
Gascoyne Resources: Dalgaranga Construction Update March 19, 2018
Gascoyne Resources: Dalgaranga Construction Update - 3 Months to First Gold February 15, 2018
Gascoyne Resources: Dalgaranga Construction Update - Less Than 5 Months Gold January 8, 2018
Gascoyne Resources Provides Construction Update for Dalgaranga Gold Project November 3, 2017

Aerial view:

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