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Australia
Mount Thorley Warkworth Operation (Mount Thorley Mine, Warkworth Mine)

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 Location:
12 km SW from Singleton, New South Wales, Australia

  Regional Office:
Level 18 Darling Park Tower 2 201 Sussex Street
Sydney
New South Wales, Australia
2000
Phone  ...  Subscription required
WebsiteWeb
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Coal (semi-soft coking)
  • Coal (thermal)
Mining Method
  • Truck & Shovel / Loader
  • Dragline
Processing
  • Wash plant
  • Spiral concentrator / separator
  • Flotation
  • Dense media separation
Mine Life23 years (as of Jan 1, 2018)
Mount Thorley Warkworth (MTW) is an integrated operation of two open cut coal mines, Warkworth Mining Limited (WML) and Mount Thorley Operations (MTO).


Owners & OPERATOR

Source:
CompanyInterestOwnership
Coal & Allied (NSW) Pty Ltd (operator)
POSCO Australia Pty Ltd. 20 % Direct
Yancoal Australia, Ltd. 82.9 % Direct
Yancoal manages Mount Thorley Warkworth on behalf of the joint venture partners:
- Mount Thorley: Yancoal Australia Ltd (80 per cent) and POSCO Australia Pty Ltd (20 per cent).
- Warkworth: Yancoal Australia Ltd (84.5 per cent) through CNA Warkworth Australasia Pty Ltd (55.722 per cent) and CNA Resources Ltd (28.75 per cent), Nippon Steel Australia Pty Ltd (9.53 per cent) and Mitsubishi Materials (Australia) Pty Limited (6 per cent).

Deposit Type

  • Sedimentary


Summary:

Mount Thorley Warkworth (MTW) is located within the Sydney Basin of New South Wales (NSW), a world–class export thermal coal mining district.

The Sydney Basin is a north-south trending basin, containing generally flat lying Permian Triassic sequences, approximately 250 km long, averages 100 km in width, ranges from 2km to 4km in depth and covers an area of approximately 37,000 km2 onshore and 15,000 km2 offshore.

Sedimentation in the Sydney Basin can be divided into many distinct depositional episodes, related to marine transgression and regression an terrestrial sedimentation. In the Sydney Basin the total thickness of the sedimentary package ranges on average from 2 to 3 km over much of the basin, based primarily on drill-hole records and deep seismic profiles.

Coal bearing formations in Permian aged sediments are extensive in the Sydney Basin and range in depth from near the surface to over 1 km. The Sydney Basin is divided into five major coalfields; Southern, Central, Newcastle, Hunter and Western, and comprised of black anthracite coal bed of a few centimetres to several meters, interbedded with sandstones, shales, tuffs and claystone. During coal bore drilling in the late 19th Century a number of bores encountered flows of natural gas.

The Late Permian coal measures show sources of both oil and gas, with the offshore basin possibility more prone to oil Fine grained sediments deposited during the brief marine incursions that took place during the Late Permian may also have some potential as oil sources.


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

Mining Method
Overview
The proposed mining method within MTW is the same as that currently employed. Large electric face shovels, hydraulic excavators and front-end loaders are utilised to load haul trucks to remove pre-strip and parting material. Draglines are used to expose lowest coal seams. Ancillary equipment in the form of drills, graders, rubber-tyred dozers and water carts will provide the mining equipment with support as required. Coal is extracted by front-end loaders and/or excavators loading haul trucks.

The current mining equipment will continue to be used. In general, changes may occur due to replacement or as technology changes.

Overburden and Interburden Material
Overburden removal at MTW is centred on shovel pre-stripping methods and dragline “stripping”. Multiple bench pre-stripping is used to expose shallower coal seams with a combination of dragline and shovel operations to remove lower interburden. Overburden removal operations generally proceed as follows:

- Tree clearing and timber harvesting is carried out under contract. Topsoil removal is carried out under contract using small earthmoving equipment such as a D6 bulldozer with a loader and trucks.

- Overburden is drilled. Generally holes stop short of the coal seams to reduce blast damage to vthe coal. Hole diameters range from 200mm to 270mm. Drill patterns depend on hole depth and hole diameter but pattern sizes will generally range from 5m x 6m to 10m x 12m.

- The overburden material is blasted according to design parameters specific to the geology, the presence of water, and the type of machine intended to dig the material. Overburden and interburden greater than 2.0m in thickness require fragmentation by drill and blasting.

- Overburden/interburden removal is performed by one of three basic methods:

- Shovel / Truck Fleet: The majority of the uppermost seams in the sequence are exposed using an electric shovel loading 240 and 320 tonne trucks. Overburden waste is hauled to dumps located across the site.
- Dragline: Single or double pass removal of loose overburden into previous strip, leaving a thin layer of material overlying the coal seam.
- Dozers: Dozers will be used to remove thin layers of interburden by directly pushing blasted overburden material into the previous void.

Coal
If the coal seam was uncovered by dragline, the thin layer of rock will be cleaned by tracked and wheeled dozers and graders. The coal seams may be blasted, ripped by dozers or free-dug by loaders depending on the nature and thickness of the coal. FrontGend loaders will operate with 180 tonne capacity trucks which haul the raw coal to either the North or South CPPs.

Mine Design
There are currently three operational pits at MTW:
- Loders pit,
- West pit and
- North pit.

Coal is planned to be mined from up to three different pits of which Loders will be completed in 2019. The Company advised RPM that the final highwall overall design slope for the North, West and Loders pit is 55 degrees and the end walls (northern and southern walls) vary between 25 and 35 degress for operational reasons. In all pits the overall slopes may vary depending on the depth of the pits, the number of benches and the number of required access roads.


Crushing and Grinding


Processing

  • Wash plant
  • Spiral concentrator / separator
  • Flotation
  • Dense media separation

Source: Subscription required

Summary:

Mineral Processing
Coal will be washed in both the North CPP and South CPP in accordance with market requirements.

North CCP
The North CPP has a nominal capacity of 6.6 million washed saleable tonnes per annum, additional capacity is available through the North CHPP’s bypass facility. This system has not been tested to its maximum capabilities, however historically around 6% of the Run-of-Mine (ROM) coal has been bypassed annually or as high as 1Mt per annum.

The North CPP is a two module plant, each capable of a raw feed rate of 800tph. Raw coal is screened into two sizes, with coarse coal of diameter > 1.4mm treated in a single or two-stage dense medium cyclone circuit and the fine fraction washed in a two-stage spiral process.

The coarse coal circuit relies on relatively simple gravity separation, with coal particles floating in a magnetite and water mixture known as dense medium. The heavier non-coal material sinks while the coal floats ........


Production:

CommodityUnits202020192018201720162015
Coal (M/T) kt  ......  Subscription required ^  ......  Subscription required  ......  Subscription required11,81712,39611,864
All production numbers are expressed as clean coal. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required96.9 Mbcm103.16 Mbcm
Coal tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required18.1 Mt17.1 Mt
Raw coal annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at :


Financials:

Units201720162015
Revenue M AUD  ......  Subscription required  ......  Subscription required 692  
EBITDA M AUD  ......  Subscription required  ......  Subscription required 164  


Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Cable reel truck ....................... Subscription required 2 May 23, 2019
Dozer (crawler) ....................... Subscription required 6 May 23, 2019
Dozer (crawler) ....................... Subscription required 21 May 23, 2019
Dozer (rubber tire) ....................... Subscription required 4 May 23, 2019
Dozer (rubber tire) ....................... Subscription required 1 May 23, 2019
Dragline ....................... Subscription required 1 May 23, 2019
Dragline ....................... Subscription required 1 May 23, 2019
Dragline ....................... Subscription required 1 May 23, 2019
Drill ....................... Subscription required 1 May 23, 2019
Drill ....................... Subscription required 4 May 23, 2019
Drill ....................... Subscription required 2 May 23, 2019
Excavator ....................... Subscription required 2 May 23, 2019
Excavator ....................... Subscription required 1 Dec 31, 2019
Excavator ....................... Subscription required 4 May 23, 2019
Grader ....................... Subscription required 1 May 23, 2019
Grader ....................... Subscription required 1 May 23, 2019
Grader ....................... Subscription required 2 May 23, 2019
Grader ....................... Subscription required 2 May 23, 2019
Grader ....................... Subscription required 1 May 23, 2019
Loader (FEL) ....................... Subscription required 3 May 23, 2019
Loader (FEL) ....................... Subscription required 2 May 23, 2019
Scraper ....................... Subscription required 2 May 23, 2019
Shovel ....................... Subscription required 3 May 23, 2019
Truck (dump) ....................... Subscription required 360 t 12 May 23, 2019
Truck (dump) ....................... Subscription required 240 t 9 May 23, 2019
Truck (dump) ....................... Subscription required 240 t 46 May 23, 2019
Truck (dump) ....................... Subscription required 190 t 17 May 23, 2019
Truck (service) 4 May 23, 2019
Truck (water) ....................... Subscription required 7 May 23, 2019
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Jul 17, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required May 6, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 17, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Annual Review 2017
Annual Report 2016
Annual Review 2015
Other 2014
Other 2013
Other 2011
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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