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Australia
Mt Morgans Operation

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 Location:
73 km E from Leonora, Western Australia, Australia

  Regional Office:
Level 19, 58 Mounts Bay Road
Perth
Western Australia, Australia
6000
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Fax+61-8-6323-9099
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • 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
  • Smelting
  • Intensive Cyanidation Reactor (ICR)
  • Filter press plant
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2027
Mt Morgans Gold Operation (MMGO) comprises a 2.5 Mtpa CIL treatment plant, the Jupiter open pit and Westralia underground mining areas.
Latest NewsDacian plots comeback following WA labour shortages     April 30, 2021


Owners

Source: p. 36, 85
CompanyInterestOwnership
Dacian Gold Ltd. 100 % Indirect
Mt Morgans Gold Operation is 100% owned by Dacian Gold Ltd.

Deposit Type

  • Banded iron formation hosted
  • Vein / narrow vein
  • Mesothermal
  • Intrusion related


Summary:

All Dacian Gold deposits are located within the Yilgarn Craton of Western Australia.

The Westralia (including Morgans North) deposits banded iron formation (BIF) hosted sulphide replacement, mesothermal Archaean gold deposits comprising sedimentary packages composed predominantly of BIF but also including chert, mudstone, shales, conglomerate and minor felsic volcaniclastic rocks. All are intercalated within or separated by ultramafic volcanic rocks and variably intruded by felsic porphyry dykes and lamprophyres. Gold mineralisation is associated with microscopic quartz carbonate veinlets within BIF. BIF acts as the primary host for mineralisation though other rock types including basalt, porphyry intrusive and ultramafic may also be mineralised in smaller volumes and with less continuity.

The Jupiter deposit is interpreted to comprise structurally controlled mesothermal gold mineralisation related to syenite intrusions within altered basalt. A majority of mineralisation is associated with large shallow east dipping shears, with significant mineralisation developing where these shears cross cut syenite intrusions or the altered basalt proximal to the syenite intrusions. A number of small structures in the form of shears, faults and veins dip either steeply to the west, or moderately towards the north-west, north and/or north-east.

At Maxwells, gold mineralisation is hosted within the BIF and is mineralised over a strike length of ~1km. Gold mineralisation is best developed in the regolith profile, although bedrock mineralisation is also present. The thicker mineralized packages and higher grades (up to 29.40g/t) appear to occur when high strain structures cross-cut the BIF, causing brittle deformation. Quartz veining is also found in association with these structures. Anomalous assays can be associated with unaltered BIF, carbonate or haematite altered bands, low sulphides (<25% pyrite replacement), regularly banded BIF and strongly fractured BIF.

The Cameron Well prospect is interpreted to comprise structurally controlled mesothermal gold mineralisation related proximal to syenite intrusions that alter the dominant basalt host. Mineralisation is dominantly flat-lying supergene mineralisation within a deeply weathered oxide profile. Within the transitional and fresh rock component of the Mineral Resource, mineralisation is hosted predominantly by sheared basalt with a strong early biotite alteration that is overprinted by a later phase of quartz-carbonate veins and chlorite-silica-pyrite alteration associated with mineralisation. Shears are often proximal or directly adjacent to felsic intrusive dykes. In some instances, the felsic intrusions are also mineralised. Mineralised structures strike in a number of orientations including northsouth dipping to the east, west-northwest with a sub-vertical dip, north-west striking with a subvertical dip and more recently north south striking with a shallow east dip.

The Mount Marven deposit is interpreted to comprise a series of lode structures striking 330-0150 and dipping approximately 60-750 . Mineralisation is associated with haematite alteration, vein quartz content, oxidation level, silicification and coarse pyrite. Contacts between the basalt and porphyry intrusive bodies are often mineralised.


Mining Methods

  • Truck & Shovel / Loader
  • Longhole open stoping


Summary:

At Mt Morgans, the Company’s five year mine plan includes the continuation of mining the Jupiter open pits and recommencement of mining at Mt Marven with a southern extension following the completion of the firststage of Mt Marven. Underground mining is planned to recommence within the Greater Westralia area, with mining campaigns focussed on extraction of stoping blocks across the existing Westralia, Craic and Transvaal underground mines as well as development of a new underground mine at Phoenix Ridge.

Open pit
Mining the Jupiter open pits of Doublejay and Heffernans continues through to the end of FY2024 when the Doublejay pit is completed. A total of 5.8Mt at 1.2g/t Au for 225,000oz will be mined from Jupiter during the three year period.

After almost four years of mining, commencing in December 2017, the Heffernans pit will reach the final design floor 200m below surface during late H1 FY2022.

The Doublejay pit is mined in three stages around the historic Joanne and Jenny pits, with the stages referred to as DBJ07, DBJ15 and DBJ14. Both DBJ07 and DBJ15 pit stages are completed during FY2022, with the quantity of ore mined increasing during the second half of the year as pre-stripping is completed and the high-grade Cornwall Shear Zone (CSZ) beneath the historic Joanne pit is exposed on mining benches. The DBJ14 stage spans the three year period FY2022-24, with pre-stripping over FY2022 prior to exposing high-grade ore zones underlying the CSZ.

For the Jupiter open pit Ore Reserve, mechanised open pit mining remains the selected mining method.

Underground mining
FY2022 sees the recommencement of underground mining at Mt Morgans, with a mining campaign planned for the Westralia underground targeting extraction of stoping blocks in the vicinity of existing development within the Beresford South and Allanson mine areas. A total of 150,000t at 4.0g/t Au for 19,400oz is planned to be mined during the year. Beyond FY2022, underground mining at the Greater Westralia Area takes a staged approach, whereby the Mineral Resource contained within stoping blocks identified as being economically viable across the various underground mine areas will continue to be systematically drilled prior to investment in mine development capital. A total of 860,000t at 4.0g/t for 111,000oz is planned to be mined from the Westralia underground during the period FY2023 to FY2026.

For the Westralia underground Ore Reserve, the underground mining method of top-down long hole open stoping with pillars remains the selected mining method.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Pebble crusher 220 kW 1
SAG mill 8.5m x 3.5m 4400 kW 1
Ball mill 5.5m x 8.9m 4400 kW 1


Processing

  • Gravity separation
  • Smelting
  • Intensive Cyanidation Reactor (ICR)
  • Filter press plant
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Mt Morgans process plant was commissioned in late March 2018 and is designed to treat an ore throughput of 2.5 million tonnes per annum. The processing plant includes a Semi Autogenous Grinding, Ball Milling and Pebble Crushing (SABC) comminution circuit followed by conventional gravity and carbon-in-leach (CIL) process.

The metallurgical process is commonly used in Western Australian and international gold mining. The same process configuration was previously utilised at Mt Morgans during the 1990s.

A metallurgical test work program was completed during the 2016 DFS using samples from diamond drill core and RC drill chips to determine: - physical properties for comminution circuit design; - optimal grind size; and - gold recovery.

Description
The crushing and milling of ores is designed to produce a P80 passing 106 microns. The MMGP ores exhibit coarse gold able to be recovered using gravity concentrators. Leach residence time will be 28 hou ........

Recoveries & Grades:

CommodityParameter202120202019
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required

Production:

CommodityUnits20222021202020192018
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required34
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2021202020192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required2,834 kt
Waste  ......  Subscription required  ......  Subscription required8.3 Mbcm
Tonnes milled  ......  Subscription required  ......  Subscription required2,664 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required2.5 Mt2.5 Mt
Subscription required - Subscription is required.

Reserves at June 30, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven 8,030 kt Gold 0.9 g/t 226 koz
Probable 3,301 kt Gold 1.5 g/t 158 koz
Proven & Probable 11,330 kt Gold 1.1 g/t 385 koz
Measured 9,130 kt Gold 1.01 g/t 298 koz
Indicated 14,720 kt Gold 1.73 g/t 819 koz
Inferred 8,530 kt Gold 2.6 g/t 713 koz
Total Resource 32,410 kt Gold 1.75 g/t 1,827 koz

Commodity Production Costs:

CommodityUnits20212020
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Financials:

Units20222021202020192018
Capital expenditures (planned) M AUD  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required1.4  
Gross profit M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required-32.9  
After-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required-5.4  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required33.5  
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required17.5  
Subscription required - Subscription is required


Heavy Mobile Equipment as of March 5, 2021:
HME TypeModelQuantityLeased or
Contractor
Drill ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 23, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 23, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 23, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 23, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 23, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 23, 2021
....................... Subscription required ....................... Subscription required Subscription required Dec 23, 2021
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 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Press Release 2017
Feasibility Study Report 2016
Subscription required - Subscription is required.

News:

NewsDate
Dacian plots comeback following WA labour shortages April 30, 2021
Dacian marches into 2021 with Mt Morgans expansion goal January 5, 2021
Dacian moves forward on underground mining strategy October 28, 2020
Dacian Gold bounces back with Mt Morgans high-grade discovery June 21, 2019
Dacian Gold closes in on 10-year mine life at Mt Morgans December 19, 2018
Macmahon contract wins guide 2018 revival August 24, 2018
Dacian Gold Pours First Gold At Mt Morgans April 3, 2018
Dacian Gold: Mt Morgans Gold Project Update - On Time And On Budget January 11, 2018
Dacian Gold Provides Update on Construction Activities at Mount Morgans Project November 16, 2017

Aerial view:

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