LOY YANG MOBILE PLANT AND EARTHWORKS
Since purchasing the State Electricity Commission's mobile plant fleet in 1992, RTL has been providing mobile plant hire and earthworks to the Loy Yang Mine. During this time RTL has developed a strong relationship with AGL Loy Yang.
RTL supply the mine with mobile plant on a wet and dry hire basis. AGL Loy Yang use dry hire plant 24 hours a day for work around the coal and overburden dredgers. Wet hire plant is used for infrastructure works in the mine which include:
- The provision of a base fleet of mobile plant.
- Earth and civil works including loading, carting and dozing activities, road making and drainage.
- Excavation of ash ponds.
- Overburden removal contracts.
- Provision of plant, labour and materials to perform conveyor shifting services and other various services to support routine operational activities.
In 2001 RTL entered into an Alliance Contract with Yallourn Energy, now known as Energy Australia, to undertake the operation of the Yallourn Mine. Under this contract RTL introduced the innovative dozer push mining system which provides the most cost-effective coal system in the Latrobe Valley.
- Introduction and management of the dozer push mining system.
- Overburden removal.
- Excavation of ash ponds.
Dozer Push Mining System
RTL’s dozer push mining system is based around a fleet of highly modified Caterpillar D11 Dozers pushing to high volume throughput Feeder Breakers which feed coal onto a face conveyor system.
The D11 Dozers are fitted with a 94m³ coal blade believed to be the biggest such blade in the world. At 3.63m high, the special purpose blade is capable of moving 70t of brown coal per push. The dozers are fitted with GPS guidance and on board survey capability which is downloaded from a central computer server.
RTL is currently working with Caterpillar on remote control capability for the dozer fleet.
The feeder breakers have been developed specifically for the Yallourn Mine with the ability to deliver up to 3000t per hour onto the conveyor belt system.
RTL transport operates a fleet of heavy haulage prime movers and floats. These are capable of hauling earthmoving and construction equipment, along with other over dimensional loads. RTL Transport also operates a range of semi-trailers to meet general freight requirements.
The RTL Transport fleet operates under VicRoads accredited mass and maintenance management protocols. Specific abilities of RTL Transport include:
- Carting any mine infrastructure up to 10m wide and 22m long.
- Transporting dozers from D4 to D9, excavators from 5-70t and compactors up to 40t.
- Fully qualified and certified pilot’s escorts and vehicles for the escorting oversize loads and taking out of VicRoads Permits.
RTL have completed a number of landmark projects. Some examples include:
PRINCES HIGHWAY EAST DUPLICATION, FLYNN TO ROSEDALE ($43m)
The Princes Highway East Duplication Project, Flynn to Rosedale, was a design and construct contract issued by VicRoads. The duplication addressd road safety, improved road capacity and provided continuity between overtaking lanes.
Major environmental challenges were working in area containing vulnerable species, endangered flora and indigenous artefacts on Gunaikurnai Land.
Major safety challenges included working adjacent to live, high-speed traffic (over 10,000 vehicle movements per day), plant/personnel/heavy vehicle interaction and working adjacent to overhead and underground services.
The project involved approximately 8.5km of duplication in total, comprising of:
- A four-lane divided carriageway with a 15m wide median.
- Two new bridges over Flynns Creek.
- A new bridge at Blind Joes Creek.
- New culverts, including a major structure at Middle Creek.
- Provision of a replacement truck stop at the existing Flynns Creek Bridge.
- Wide median treatments at Flynns Creek Road, Wrights Lane and Cricket Street intersections.
- Strengthening of the existing bridge over Blind Joes Creek.
LONGFORD GAS CONDITIONING PLANT ($40m)
In October 2013, RTL Mining and Earthworks was awarded the $8m site preparation contract for earthworks, roads and drainage for the new Exxon Mobil Gas Conditioning Plant at Longford.
Over the duration of the project the client continually expanded the scope of RTL’s work. This can be attributed to RTL’s ability to meet the client’s high-specification civil requirements.
RTL commenced site works on 3rd December 2013, on a greenfield site to the east of the existing gas plant. The initial program of works was six months duration, consisting of:
- 150,000m³ of earthworks and 43,000m² of plant road construction.
- 700Lm of insitu concrete trench construction.
- 2,300Lm of HDPE fire service main.
- 15,000m³ HDPE lined, storm water pond.
- RCP drainage.
- Cyclone mesh security fencing.
- 10,000m² asphalting.
Further work awarded included mechanical, electrical, underground pipeline and associated works. The original $8m contract eventuated into RTL completing $40m worth of work.
MORWELL RIVER DIVERSION ($120m)
Diversion of the Morwell River through the Yallourn Open Cut was undertaken under an alliance style contract for Yallourn Energy (now Energy Australia). The project commenced in 2000 and was completed on time and under budget in 2005.
The project involved the placement of 13 million m³ of engineered fill to create an elevated aqueduct some 3.5 km in length. The embankment accommodated 4 conveyor tunnels through which coal is transported to the power station. The project was a finalist in the 2006 Victorian Construction Achievement Awards.
RIVERS AND ROADS RELOCATION ($100m)
In 2006 RTL were awarded an alliance style contract to divert the Morwell River and other tributaries around the Morwell Open Cut. A new alignment of the Strzelecki Highway and the Morwell River was required by the client in order to expand the open cut mine at Hazelwood Power Station.
- 10 million m³ of earthworks.
- Diversion of the Morwell River as well as smaller diversions of Wilderness Creek and Eel Hole Creek.
- Relocation of 7.5km of the Strzelecki Highway included the construction of two bridges as well as all roadworks and drainage.
- Re-routing of the existing OD9 route including upgrading 5km of rural roads.
VICTORIAN DESALINATION PLANT
RTL was engaged as the principal earthworks provider on the Victorian Desalination Plant project.
RTL was the first contractor on site and maintained a presence on site until the plant gained final acceptance.
The initial project was to form a bench for the reverse osmosis desalination plant.
RTL’s scope was increased to include:
- All road works.
- Box cut construction.
- Storm water drainage.
- Acid sulphate soil treatment.
- Earthworks for treated water storage ponds and dune construction.
- Excavation for all underground services.
- Construction of subsoil drainage and all site dewatering.
MORWELL MAIN DRAIN
RTL were awarded the contract for the remediation work for the Morwell Main Drain in 2012. The drain was of series safety concern due to been situated between the Princes Freeway and the Morwell Open Cut Mine.
The remediation works included lining 1,800m of drain with a combination of clay and impervious liners. The works were successfully completed before winter in 2013.