The simplest solution to handle groundwater inflows in underground mines is to deal with dewatering design early within the mission lifecycle, with the simplest underground dewatering options established lengthy earlier than the primary shaft is sunk, in keeping with John Goulding, Examine Supervisor Mine Engineering at Cementation Africa.
“Hydrogeological research type a part of the mine’s preliminary feasibility work, with drill holes to know what volumes the mine is more likely to encounter,” he explains. “Cementation Africa, as a number one underground mining contractor, makes use of this information as the premise for planning a dewatering technique in a multi-disciplinary engineering course of that intersects mine design, shaft infrastructure, energy programs and operational logistics.”
Cementation Africa has constructed a popularity for addressing dewatering challenges by an built-in engineering strategy that hyperlinks design, development and operational realities underground, he says.
“Our energy lies in our capability to design and execute dewatering options throughout the total mission lifecycle – from feasibility by to the operation of pump stations,” he explains. “This contains the civil, mechanical, electrical and management design elements that should come collectively in an underground dewatering system.”
Early planning is crucial to making sure that pump stations, settling and storage infrastructure are appropriately positioned and sized to handle anticipated inflows. It additionally permits engineers to include flexibility into the system, permitting it to reply as mining circumstances evolve.
Louis du Plessis, Undertaking Engineer Mine Engineering at Cementation Africa, notes that the corporate is commonly concerned at an early stage, supporting shoppers with feasibility-level engineering and possibility assessments.
“By conducting research and technical assessments to information mines’ decision-making, we might help them decide probably the most applicable strategy earlier than committing to main infrastructure investments,” du Plessis says. He emphasises that the complexity of underground dewatering requires options tailor-made to every mine’s particular infrastructure and working circumstances.
“This implies working very intently with our shoppers, understanding what they want, and designing round that,” he says. “This collaborative course of results in engineering options aligned with operational realities relatively than purely theoretical designs.”
Cautious consideration should even be given to the sensible placement of infrastructure. Pump stations should be positioned the place they are often accessed safely and maintained effectively, whereas pipelines should be routed by shafts and haulages with out interfering with different crucial companies equivalent to energy cables and air flow programs.
“Even with research and modelling, there stays appreciable uncertainty concerning the volumes of water that miners will encounter throughout growth and mining,” Goulding says. “This makes it important to design dewatering methods that may adapt to various circumstances relatively than merely working at a set capability.”
To accommodate this uncertainty, programs might embrace spare pumping capability or be designed for future enlargement. As well as, configurations can enable water to be transferred between completely different ranges of the mine as operations deepen, guaranteeing that dewatering stays efficient all through the lifetime of the mine.
