20181205_143855 - LW10 bund wall filling
20181210_100935 - LW10 drain Gypsum spre
20181205_143243 - LW10 bund wall filling
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181130 - LW12 Rock Chute Filter Layer (5
181128 - LW12 Rock Chute Spreading Gypsu
181128 - LW12 Rock Chute Spreading Gypsu
181104 - LW12 1st Lift (2)
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20181128 - LW12 rock chute Gypsum spread
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20181207_114443 - LW10 drain final trim

BMA Broadmeadow MinE, Civil Repairs and Upgrades

BHP Billiton Mitsubishi Alliance (BMA)

Moranbah, Queensland

$7.4 million

Broadmeadows underground coal mine is located in the Bowen Basin Region of Queensland, 25km from Moranbah.


ALLROADS was awarded four separate packages of work to ensure the environmental responsibilities of the mine were met while maintaining coal mining production capabilities. Due to the high-quality performance of the original packages of works, ALLROADS were then awarded subsequent packages.

 

Three core areas of work were as follows:

 

1. Bulk earthworks to construct engineered bund walls and drains to alleviate surface subsidence caused by underground mining operations including:​

  • Clearing and grubbing, strip and re-spread topsoil,

  • Stormwater drainage installation and treatment of non-cohesive sodic soils,

  • Ground Surface Treatment, Clay Core construction, and general bulk earthworks.

2. Formation of rock-lined drainage chutes, drop structures and check dams to repair erosion damage in numerous locations along the Isaac River banks and subsidence cracks adjacent to the work area including:

  • Detailed excavation,

  • Import and placement of quarry rock of various sizes for rock structures.

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3. Construction of heavy plant access road and borehole drilling hardstand to facilitate expansion of the mine’s production capabilities including:

  • Bulk cut to fill earthworks,

  • Import and placement of quarry materials for unbound pavement construction.

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Water management was a priority throughout the project given the hot and dry environment at the site, with temperatures in excess of 45 degrees. To combat this ALLROADS deployed a fleet of up to five water trucks at any one time for optimum moisture to be achieved during earthworks operations and to ensure environmental expectations were met in regard to dust control. 

  • 5.3ha of clearing & grubbing, topsoil strip and subsequent respread

  • 45,000m3 cut to fill earthworks (bulk and detailed excavation)

  • Import and placement of 4,400t of quarry materials for rock lined drains and structures

  • 33,500m2 ground surface treatment including Gypsum stabilisation

  • Supply, spread and compact 5,400t haul road granular pavement materials

  • 60,000m3 of clay core construction and 80,000m3 of general Bulk Earthworks

  • Detailed Project Management Plans and Construction Methodologies

  • Compliance with Coal Mining Safety and Health Act 1999, Coal Mining Safety and Health Regulation 2017 and BMA HSE regulations.
     

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