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Australia
Isaac Plains Complex (Isaac Downs Mine)

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 Location:
10 km E from Moranbah, Queensland, Australia

  Regional Office:
Level 32, 12 Creek Street
GPO Box 2602 Brisbane QLD 4001
Brisbane
Queensland, Australia
4000
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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
Commodities
  • Coal (metallurgical & thermal)
Mining Method
  • Truck & Shovel / Loader
  • Dragline
Production Start...
Mine Life8 years (as of Jan 1, 2019)
The Complex comprises the Isaac Plains Mine and processing facilities, the adjoining Isaac Plains East and Isaac Downs mining areas, and the Isaac Plains Underground development project.

Stanmore Resources acquired Isaac Plains in November 2015, after the operation was placed in care and maintenance in late 2014 by the previous owners.

Mining recommenced at the Isaac Plains Mine in January 2016 and transitioned to the operations at Isaac Plains East from July 2018 through to January 2019. Most mining operations now occur at Isaac Downs.

Isaac Downs was approved for construction and operation in July 2021, and is expected to produce up to approximately 35Mt of ROM coal over 16 years.


Owners

Source: p. 128,129
CompanyInterestOwnership
Golden Energy and Resources Ltd. (GEAR) 75.33 % Indirect
Stanmore IP South Pty Ltd (operator) 100 % Direct
Stanmore Resources Limited is a 75.33% indirect subsidiary of Golden Energy and Resources Limited, and has two principal assets - the producing Issac Plain Complex and Issac Down.

Contractors

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Deposit Type

  • Sedimentary


Summary:

IPC lies within the Permo-Triassic Bowen Basin. The Bowen Basin consists of 10 kilometre (km) thick sequences of volcanic, shallow marine and terrestrial sediments and is categorised back-arc to foreland basin.

The general stratigraphy of IPC includes (oldest to youngest)
- Lower-Permian Reids Dome Beds;
- Lower-Upper Permian Back Creek Group;
- Upper Permian Blackwater Group, and Rewan group.

Coal seams occur within the Rangal Coal Measures which are Late Permian in age. These seams dip gently to the east at approximately 5 degrees.

The coal seams found within the Rangal Coal Measuresare the Leichhardt, Leichhardt Upper and Leichhardt Lower, and Vermont.

The seams have a cumulative thickness of approximately 7-10 m across the deposit.

The Vermont seam was not included in the resource estimate due to the lack of geological information. The results at hand indicate the coal to be of poorer quality.


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

The depth limit of potential open-cut mining varies based on multiple and variable inputs. Presently the limit of open-cut mining is likely to occur between 100 to 150m (depth from surface). If underground mining were to take place, a minimum mining thickness of 1.5m would be required. As such a minimum seam mining thickness was applied to depths >150m, thereby excluding any seams <1.5m thickness from the resource estimate.

Absolute depth of resource was a maximum of 330m from topography.

The mining methodology considered for this estimate is:

• a combination of cast, doze, dragline or truck & excavator to move waste into the adjacent strip or dump. The strip width selected is nominally 55m at IPM and 50m at IPE.
• Drilling and blasting (D&B) of the in situ waste.
• A maximum horizon of 50m of waste is allocated to the dragline.
• Remaining waste is removed by truck and excavator.
• Coal mining using excavators and rear dump trucks haul the coal to the Isaac Plains Complex Coal Preparation Plant (IPC CHPP) for washing.
• Parting > 0.3m thick is stripped separately.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2021202020192018
Coal (metallurgical & thermal) kt  ......  Subscription required  ......  Subscription required  ......  Subscription required1,128
All production numbers are expressed as clean coal.
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Operational Metrics:

Metrics2021202020192018
Waste  ......  Subscription required  ......  Subscription required25.8 Mbcm23.4 Mbcm
Stripping / waste ratio  ......  Subscription required  ......  Subscription required8.8 bcm/t14.2 bcm/t
Coal tonnes mined  ......  Subscription required  ......  Subscription required2,929 kt of ROM coal1,643 kt of ROM coal
Tonnes processed  ......  Subscription required  ......  Subscription required2,951 kt1,602 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required3.5 Mt
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Reserves at December 31, 2021:

CategoryOreTypeTonnage CommodityMarketable Coal
Proven Total 33.8 Mt Coal (metallurgical & thermal) 24.3 Mt
Probable Total 8.8 Mt Coal (metallurgical & thermal) 6.9 Mt
Proven & Probable Total 42.5 Mt Coal (metallurgical & thermal) 31.2 Mt
Measured Total 71.8 Mt Coal (metallurgical & thermal)
Indicated Total 43.2 Mt Coal (metallurgical & thermal)
Inferred Total 48 Mt Coal (metallurgical & thermal)
Total Resource Total 163 Mt Coal (metallurgical & thermal)

Commodity Production Costs:

CommodityUnits2021202020192018
Cash costs (sold) Coal (metallurgical & thermal) AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 82.3 / t  
Total cash costs (sold) Coal (metallurgical & thermal) AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 110 / t  
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Financials:

Units202120202019
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment as of July 5, 2019:
HME TypeModelSizeQuantity
Excavator ....................... Subscription required 600 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
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