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Ventilation System Design For The Wassa Underground Mine

Brian Prosser, Keith Wallace
Tuesday, April 30, 2019
First presented: 
North American Mine Ventilation Symposium
Mine Ventilation

This paper describes a ventilation project at the Wassa gold mine in Ghana.  Golden Star (Wassa) (GSWL), a subsidiary of Golden Star Resources, owns and operates the mine. Golden Star holds a 90% interest in GSWL, while the Ghanaian Government holds the remaining 10% ownership, earning a 5% royalty on the gross revenue of GSWL’s gold production. Construction of the underground mine began in mid-2015 and pre-commercial production started in June 2016. Commercial production from the underground mine was achieved in January 2017. This paper describes the ventilation studies performed to support the initial development and production at the mine. The initial ventilation design included four, parallel surface exhaust fans.  Future designs will include booster fans, new primary fans, and additional connections to surface. The paper describes the long-term ventilation planning goals and expectations as the mine achieves a production of 4,000 tpd with truck haulage to surface.

Feature Author

Brian Prosser

Mr. Prosser has over 20 years of experience in the design and planning of large underground ventilation systems, ventilation and air climatic surveys, network analysis, dust and gas control, and the development of network ventilation and fire models. He has experience overseeing numerous ventilation studies involving nuclear waste repositories, hard rock mines, and coal mines. Brian has performed ventilation studies, surveys, optimization and planning for mines located in North America, South America, Europe and Indonesia. Brian has been responsible for survey planning, coordination with third party consultants and vendors, business development and job estimating. He has also conducted ventilation short courses to expand the knowledge base of clientele.

Mine Ventilation Specialist
SRK Clovis
Keith Wallace
Mr. Wallace has over 30 years of underground ventilation experience. He manages a small team of engineers in the design and implementation of underground mine ventilation systems for mining and civil projects around the world. Worldwide there are less than five firms that specialize in only underground mine ventilation.
Mr. Wallace has been active in the ventilation community by serving on the executive committee of the Underground Ventilation Committee of the Society of Mining Engineers, publishing over 30 papers on various aspects of ventilation and was the editor of the 12th US/North American Mine Ventilation Symposium. He has been in involved with numerous ventilation studies at both metal/non-metal mines, coal mines and tunnel construction projects throughout the world. Mr. Wallace is also active in developing ventilation software and organizing and has conducted over 40 workshops on ventilation planning and design to mining professionals.
Mine Ventilation Specialist
MS Eng. Mineral Engineering, Underground Ventilation
SRK Clovis
SRK Africa