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Australia
Mount Monger Operation (Aldiss Centre, Daisy Centre, Imperial/Majestic Mine, Mount Belches Centre)

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 Location:
47 km SE from Kalgoorlie, Western Australia, Australia

  Address:
PO Box 750
Kalgoorlie
Western Australia, Australia
6433
Phone  ...  Subscription required
Fax+61-8-9024-2013
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 / Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Longhole open stoping
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Latest NewsMacmahon finalises contract with Silver Lake Resources     April 3, 2020


Owners

 
CompanyInterestOwnership
Silver Lake Resources Ltd. 100 % Direct

Deposit Type

  • Breccia pipe / Stockwork
  • Sedimentary
  • Banded iron formation


Summary:

The Daisy Milano mine lies between the Christmas Flats and Lorna Doone Pits and contains several mineralized structures including the one which is also exposed in the Christmas Flats Pit. Gold is hosted in narrow quartz veins at or near contacts between NNW-trending porphyritic dikes and the surrounding andesite which is either pillowed or brecciated.

SW, and cross-cut by moderately N-dipping tourmaline-bearing quartz veins, post-dating gold mineralization (and also found in the Lorna Doone Pit). Gold-bearing quartz veins are usually steeplydipping WSW, parallel to the dikes but sometimes dip more gently near faults. These quartz veins are typically very narrow (<1 cm to 5 cm) and can define ptygmatic folds within porphyritic dikes. The ore-shoot in the mine plunges moderately to SE.

The gold mineralisation at Majestic and Imperial deposits is hosted by a quartz diorite stock on the western side of the regional scale Yindarlgooda Dome. Gold zones are characterised by open breccias, quartz veins and zones of foliation associated with pyrite + chalcopyrite + pyrrhotite, overprinting silicasericite alteration. The highest grade gold-copper zones at Imperial are characterised by a micro breccia sulphide fracture network fill with semi-massive sulphides that almost completely overprints the silicasericite alteration, in discrete zones that are up to 5m true width.

The Cock-eyed Bob is hosted within the upper ‘Santa Clause’ member of the Banded Iron Formation (BIF) of the Mount Belches group. The Mount Belches group is located in the southern Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia.

The ‘Flora Dora’ deposit is hosted within the lower ‘Maxwells’ member of the Mount Belches group and the ‘Santa’ deposit is hosted within the upper ‘Santa’’ member both members are located in the southern Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia.

Aldiss deposits Main Zone, Harry’s Hill, Tank/Atreides, Italia/Argonaut, French Kiss and Spice are hosted in amphibolites and metasediments striking north/south and dipping steeply to the west. The vast majority of the gold mineralisation occurs in amphibolite rock that has metamorphic foliations generally running subparallel to the sedimentary layering. The gold mineralisation dips steeply to the west with a variety of plunges from 30° to the north at the Karonie main zone deposit to 30° south at French Kiss.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole open stoping


Summary:

Daisy Complex is currently mined using handheld and mechanised methods. Airleg development and stoping is undertaken in narrower ore zones while in all other areas ore production is derived from single and twin boom jumbo development and selective longhole stoping.

Mining from the Majestic open pit commenced July 2016 and will continue until Q2 FY2018

The Mount Belches mining centre is located 18km from the Randalls Mill and currently comprises the Maxwells and Cock-eyed Bob underground mines.

For Cock-eyed Bob Mechanised Longhole Open Stoping has been adopted as the primary stoping method.

Multiple open pit ore sources and identified targets: Harry’s Hill, French Kiss, Karonie South, Spice, Tank, Atriedes, Main Zone.


Crushing and Grinding


Processing

  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

All ore from the Mount Monger Operation is processed through the 1.3 mtpa Randalls facility, located 65 km south east of Kalgoorlie and is 15 km from the Daisy Complex.

Gold recovery consists of both a gravity circuit containing two gravity concentrators an intensive cyanidation unit and hybrid CIP circuit comprising two leach tanks and six adsorption vessels. Gold is stripped from the loaded using a pressure Zadra type elution circuit consisting of two elution columns and the gold is subsequently recovered from the cathodes of the gravity and electrowinning cells.

Recoveries & Grades:

CommodityParameter2019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 3.74.23.53.4
Subscription required - Subscription is required.

Production:

CommodityUnits2019201820172016
Gold oz  ......  Subscription required  ......  Subscription required135,837131,109
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,286,196 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required1,236,600 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 1,517 kt Gold 2.6 g/t 123 koz
Probable 3,569 kt Gold 3.2 g/t 370 koz
Proven & Probable 5,086 kt Gold 3 g/t 493 koz
Measured & Indicated 19,269 kt Gold 3.5 g/t 2,153 koz
Inferred 11,755 kt Gold 4.1 g/t 1,534 koz
Total Resource 31,024 kt Gold 3.7 g/t 3,688 koz

Commodity Production Costs:

CommodityUnits2020201920182017
Credits (by-product) Gold AUD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required -6 / oz
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 1,359 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2020201920182017
Capital expenditures (planned) M AUD  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 9, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Corporate Presentation 2017
Quarterly Report 2017
Quarterly Report 2016
Quarterly Report 2015
Press Release 2012
Subscription required - Subscription is required.

News:

NewsDate
Macmahon finalises contract with Silver Lake Resources April 3, 2020
Silver Lake lines up Macmahon for $200m contract February 19, 2020

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