The development of the Amoma pit, the fourth and last pit in the Ahafo South permitted gold mining area in Ghana, presented numerous challenges, including no pre-existing roads leading in or out of this remote location. Extreme topography and adverse weather conditions required extensive research and engineering to address the issues related to logistics, water management, sedimentation control, and security.
We undertook design, engineering, and construction oversight of a 10-km (6.2-mile) long mine haul road and associated infrastructure. This included a lined pit-water storage pond, pit-water pump station, delivery pipeline, mine waste dump, mine pit safety berms, and a large sediment control dam, as well as an integrated network of surface water management channels and associated structures.
The haul road alignment, which also traversed low-land terrain that frequently floods during Ghana’s wet season, was constructed well above the original ground surface. It was designed, with perimeter safety berms, to support two-way traffic for large haul trucks that, when fully loaded, weigh up to 280 tonnes.
The mine haul road stream crossings included one major concrete bridge and 16 multi-plate steel culverts.