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Australia
Isaac Downs Mine (Isaac Plains Complex)

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 Location:
10 km E from Moranbah, Queensland, Australia

  Regional Office:
Level 15, 133 Mary Street
Brisbane
Queensland, Australia
40000
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • 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 Life16 years (as of Jan 1, 2020)
Construction of the new underpass and diversion of the Peak Downs Highway to allow coal haulage from Isaac Downs have been completed. The dragline transitioned to Isaac Downs where, following a major maintenance shutdown, commenced overburden uncovery at low strip ratios marking the official transition to full production at Isaac Downs.


Owners

Source: p. 128,129
CompanyInterestOwnership
Golden Energy and Resources Ltd. (GEAR) 75.33 % Indirect
Stanmore IP South Pty Ltd (operator) 100 % Direct
Stanmore IP South Pty Ltd, a wholly owned subsidiary of Stanmore Resources Limited (formerly known as Stanmore Coal Limited), is the proponent for the Isaac Downs Project.

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:

Isaac Downs is located in the northern part of the Permo-Triassic Bowen Basin containing principally fluvial and some marine sediments. The economic seams are contained in the Late Permian Rangal Coal Measures which are approximately 100 m thick. The Rangal Coal Measures are underlain by the Fort Cooper Coal Measures and overlain by the Late Permian to Early Triassic Rewan Group. The transition from the Rangal Coal Measures to the Rewan Formation is 15 to 60 m above the first major seam of the Rangal Coal Measures. The Fort Cooper Coal Measures comprise typically tuffaceous sandstones, siltstones, mudstones and coal seams. The transition between the Rangal Coal Measures and the Fort Cooper Coal Measures is generally clearly marked by the Yarrabee Tuff - a basin-wide marker bed comprised of weak, brown tuffaceous claystone. The first coal seam of the Fort Cooper’s is the Girrah Seam which is 25 metres or more below the Vermont Seam within the Project area.

Alluvium occurs along the Isaac River. The alluvial sediments comprise a fining-upward sequence of unconsolidated sand, silt, clay, gravel, and lithic fragments. The alluvium may extend to a distance up to 750 m from water courses. However, the lateral extent of alluvium may be highly variable.

In the Project area, the Rangal Coal Measures dip to the east to north east (2 to 6 degrees) and include interbedded sandstone, siltstone, and lesser amounts of carbonaceous mudstones, coal, and tuff. A weathered ........


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

The mine will utilise an open cut mining technique where strips and blocks will be mined in succession, thus allowing waste from one strip or block to be dumped into a previously mined out area. Waste from an initial strip or boxcut will be dumped into an out of pit dump (ex-pit spoil) to the west of the pit area.

Under the BFS mine planning scenario, the initial Isaac Downs box cut will be established where the coal seam is close to the surface topography using an excavator and truck operation at low strip ratios. Subsequently, the dragline will be ‘walked’ from Isaac Plains to Isaac Downs and a standard Bowen Basin dragline operation will be established from north to south, supported by excavator and truck pre-strip operations.

A series of mine stage plans has been developed for the Project, showing the progression of mining activities at each stage. These stage plans have underpinned the assessment and management of Project impacts during and post operations. The Project open cut mining will involve the following activities:
- clearing of any vegetation;
- stripping and stockpiling of topsoil;
- drilling and blasting of pre-strip overburden;
- removing the pre-strip overburden using truck and shovel fleets and/or dozers;
- drilling and blasting of overburden;
- overburden removal by dragline;
- coal mining using excavators;
- progressive rehabilitation of overburden emplacement areas.

The coal will be ........


Crushing and Grinding


Processing

Source: Subscription required

Summary:

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Production:

CommodityUnitsAvg. Annual (Projected)LOM (Projected)
Coal (metallurgical & thermal) Mt 2.219
All production numbers are expressed as clean coal.


Reserves at December 31, 2021:

CategoryTonnage Commodity
Proven 14.2 Mt Coal (metallurgical & thermal)
Probable 0.3 Mt Coal (metallurgical & thermal)
Proven & Probable 14.4 Mt Coal (metallurgical & thermal)
Measured 29 Mt Coal (metallurgical & thermal)
Indicated 3 Mt Coal (metallurgical & thermal)
Measured & Indicated 32 Mt Coal (metallurgical & thermal)



Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Dragline ....................... Subscription required Oct 23, 2020
Excavator ....................... Subscription required 600 t ....................... Subscription required Dec 31, 2020
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 23, 2020
....................... Subscription required ....................... Subscription required Subscription required Nov 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 16, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Half-year Report 2022
................................... 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 2020
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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