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Australia
Meekatharra Gold Operations (MGO)

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 Location:
1 km E from Meekatharra, Western Australia, Australia

  Regional Office:
Level 6
197 St Georges Terrace
Perth
Western Australia, Australia
6000
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Fax+61-8-9462-3499
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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 & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Sub-level caving
  • Sub-level open stoping (SLOS)
  • Longhole stoping
  • Bench stoping
Processing
  • Smelting
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life4 years (as of Jan 1, 2019)
Meekatharra Gold Operations (MGO) include the historic gold mining centres of Meekatharra North, Paddy’s Flat, Yaloginda, Nannine and Reedy’s. The MGO processing hub incorporates the 1.6-1.8 Mtpa Bluebird processing plant.

The Bluebird underground mine recommenced in FY21.
Latest NewsWestgold starts third underground mine with Triton launch     July 22, 2021


Owners

Source: p. 10
CompanyInterestOwnershipInvestor's Info
Westgold Resources Ltd. 100 % Indirect
Ownership Tree
The CMGP (Central Murchison Gold Project (Meekatharra Gold Operations (MGO) + CGO (Cue Gold Operations) consolidated) tenements are held by the Big Bell Gold Operations (BBGO) of which Westgold has 100% ownership.

Deposit Type

  • Sedimentary - Volcanogenic
  • Banded iron formation hosted
  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

MGO is located in the Achaean Murchison Province, a granite-greenstone terrane in the northwest of the Yilgarn Craton. Greenstone belts trending north-northeast are separated by granite-gneiss domes, with smaller granite plutons also present within or on the margins of the belts.

The Paddy’s Flat area is located on the western limb of a regional fold, the Polelle Syncline, within a sequence of mafic to ultramafic volcanics with minor interflow sediments and banded iron-formation. The sequence has also been intruded by felsic porphyry dykes prior to mineralisation. Mineralisation is located along four sub-parallel trends at Paddy’s Flat which can be summarized as containing three dominant mineralisation styles:
• Sulphide replacement BIF hosted gold. Quartz vein hosted shear-related gold.
• Quartz-carbonate-sulphide stockwork vein and alteration related gold.

The Yaloginda area is a gold-bearing Archaean greenstone belt situated ~15km south of Meekatharra. The deposits in the area are hosted in a strained and metamorphosed volcanic sequence that consists primarily of ultramafic and high-magnesium basalt with minor komatiite, peridotite, gabbro, tholeiitic basalt and interflow sediments. The sequence was intruded by a variety of felsic porphyry and intermediate sills and dykes.

The Reedy’s mining district is located approximately 15 km to the south-east to Meekatharra and to the south of Lake Annean. The Reedy gold deposits occur with- in a north-south trending greenstone belt, two to five kilometres wide, composed of volcano-sedimentary sequences and separated multiphase syn- and post-tectonic granitoid complexes.

The Paddy’s Flat Trend is mineralised a strike length of >3,900m, a lateral extent of up +230m and a depth of over 500m.

Bluebird is mineralised a strike length of >1,800m, a lateral extent of up +50m and a depth of over 500m.

Triton – South Emu is mineralised a strike length of >1,100m, a lateral extent of several meters and a depth of over 500m.


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level caving
  • Sub-level open stoping (SLOS)
  • Longhole stoping
  • Bench stoping


Summary:

The Bluebird plant receives underground ore from the Paddy’s Flat, South Emu - Triton and Bluebird underground mines and supplementary lower grade open pit ore from Five Mile Well, Maid Marion, Albury Heath and Aladdin open pits.

The Bluebird underground mine recommenced in FY21, following the temporary suspension of development works due to a skilled labour shortage. During the temporary closure, an extensive underground drilling program was completed producing excellent results and extending the resource significantly.

With the recommencement of mining at Bluebird, Westgold now operates three underground mines at MGO, including Paddy’s Flat and South Emu – Triton. At steady state production, these three mines are expected to deliver more than 100,000oz per annum to the Bluebird processing plant with potential supplemental ore available from the Aladdin, Albury Heath and Maid Marion deposits.

Open Pit
A majority of the open pits have a final design wall angle of 39-46 degrees. Dilution of the ore through the mining process has been accounted for within the Ore Reserve quoted inventory. Various dilution ratios are used to represent the style of mineralisation. Minimum mining widths have been accounted for in the designs, with the utilisation of 40t or 90t trucking parameters depending upon the size of the pit excavation.

Underground
In large disseminated orebodies sub level caving, sub level open stoping or single level bench stoping production methodologies are used. In narrow vein laminated quartz hosted domains a conservative narrow bench style mining method is used. In narrow flat dipping deposits a Flat Long Hole process is adopted (with fillets in the footwall for rill angle) and or jumbo stoping. Minimum mining widths have been applied in the various mining methods.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
SAG mill
Ball mill


Processing

  • Smelting
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The MGO (Meekatharra Gold Operations) project hub incorporates the 1.6-1.8 Mtpa Bluebird processing hub.

MGO has an existing conventional CIL processing plant – which has been operational in various periods since the late 1980’s.

Gold extraction is achieved using single stage crushing, SAG & ball milling with gravity concentration and Carbon in Leach.

A long history of processing through the existing facility demonstrates the appropriateness of the process to the styles of mineralisation considered.

No deleterious elements are considered, as a long history of processing has shown this to be not a material concern.

Recoveries & Grades:

CommodityParameter202120202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required84.186.791.9
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required2.562.341.36

Production:

CommodityUnits202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required112,430101,33937,182
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,121,935 t1,628,282 t1,550,040 t1,096,663 t
Tonnes processed  ......  Subscription required  ......  Subscription required1,310,499 t1,627,141 t1,516,658 t925,069 t
Annual processing capacity  ......  Subscription required  ......  Subscription required1.5 Mt1.7 Mt
Subscription required - Subscription is required.

Reserves at June 30, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven 1,393 kt Gold 2.05 g/t 92 koz
Probable 3,956 kt Gold 2.64 g/t 336 koz
Proven & Probable 5,349 kt Gold 2.49 g/t 428 koz
Measured 2,443 kt Gold 3.12 g/t 245 koz
Indicated 23,887 kt Gold 1.88 g/t 1,443 koz
Inferred 19,079 kt Gold 2.04 g/t 1,252 koz
Total Resource 45,411 kt Gold 2.01 g/t 2,940 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,492 / oz† 1,303 / oz† 1,436 / oz†
C1 cash costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,260 / oz† 1,133 / oz† 1,255 / oz†
All-in costs Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 2,131 / oz† 1,842 / oz† 3,154 / oz†
C2 total cash costs Gold AUD  ......  Subscription required†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required92.4   78   70.6  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required181.3   167.6   56.5  
Gross profit M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 3, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Annual Report 2016
Annual Report 2013
Subscription required - Subscription is required.

News:

NewsDate
Westgold starts third underground mine with Triton launch July 22, 2021
Westgold restarts Bluebird following labour concerns July 8, 2021

Aerial view:

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