Optimising longhole open stoping design using geospatial techniques: a case study from Ghana
DOI:
https://doi.org/10.55779/ng61554Keywords:
Datamine, Deswik, geospatial techniques, Longhole open stoping, underground miningAbstract
Underground mining is a critical process for extracting mineral resources from deep within the earth, requiring meticulous planning and design to ensure operational efficiency and safety. Traditional LHOS design often relies on empirical methods, which may not fully utilise geological data or optimise for economic and geotechnical constraints. This study aimed to evaluate the application and effectiveness of integrated geospatial techniques in optimising the LHOS design for a steeply dipping gold orebody in Ghana. The study objectives were achieved through a comprehensive approach that included a literature review of related works, the application of a mineable stope optimiser, the design of underground infrastructure, the installation of lasers for drive development, and the reporting of material volume and dilution. The block model was employed to generate mineable stopes, with the underground mine design extending across seven levels, each spaced 25 m apart. The design strategically left stopes above the second level (125 mRL) as unmined pillars for stability. Key infrastructure elements included a ventilation and hoisting shaft, two internal ramps, crosscuts, footwall drives, and ore drives. Open stoping operations were planned to commence on the second level, retreating towards the footwall drive, with ore being tipped into a nearby ore pass for hoisting. Implementation utilised geospatial techniques, with lasers installed to guide drive development and ensure accuracy. Analysis of the optimised design indicated a Life of Mine (LoM) of 15 years, with projected material movement detailed. The workflow demonstrated how geospatial tools can enhance precision in stope layout and infrastructure planning. This study underscores the importance of precise engineering in the successful exploitation of deep-seated mineral resources.
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Copyright (c) 2026 Saviour MANTEY, Obed Gyamfi AMPONSAH, Isaac Selasi Kojo ATTIPOE
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