Once considered a background engineering service, ventilation is emerging as a central factor in the safety, productivity, and economic viability of Zimbabwe’s underground mines, Mining Zimbabwe can report.
For Dr Tonderai Chikande, President of the Mine Ventilation Society of Zimbabwe (MVSZ), ensuring that ventilation systems keep pace with the full Life of Mine (LoM) has become one of the sector’s most pressing challenges. He notes that as mines deepen and mechanise, ventilation can no longer be treated as a secondary concern. Instead, it plays a decisive role in whether operations remain safe and economically sustainable.
“Ventilation is no longer a background engineering service,” Dr Chikande explained. “It has become a primary determinant of safety, productivity, energy performance, and the economic viability of mines—whether large-scale mechanised operations or smaller conventional and artisanal workings.”
In recent years, Zimbabwe’s mining sector has pushed into deeper ore bodies while increasing mechanisation to boost production. Rising safety standards and higher energy costs have reinforced the need for ventilation to be treated as a strategic priority rather than a reactive afterthought.
Heat and Environmental Pressures at Depth
Deep-level mining brings inherent risks, particularly the challenge of rising underground temperatures. In some operations, rock temperatures can exceed 60°C, creating extreme heat and humidity. Mechanised mines add to this pressure with diesel fleets, high-powered machinery, and electrical infrastructure, all of which intensify thermal loads.
For large mechanised operations, Dr Chikande says robust cooling systems, high-volume fans, and carefully engineered airflow networks are essential. Conventional mines must balance adequate airflow against energy costs, while artisanal miners face the gravest risks; narrow shafts and minimal monitoring leave workers vulnerable to heat stress and oxygen deficiency.
The Complexity of Airflow Management
Managing airflow is not just about heat; it requires meticulous network planning. As mines expand laterally and vertically, airway resistance increases, making it harder to deliver sufficient ventilation to working faces. Dr. Chikande warns that many conventional operations only respond once problems arise, rather than anticipating them.
Large Mines: Require advanced modelling, booster fans, and staged infrastructure aligned with LoM plans.
Small/Artisanal Operations: Informal development can unintentionally block airflow, increasing exposure to dust, fumes, and gases.
Early integration of ventilation design into mine planning is the key to preventing these hazards.
Mechanisation and Automation Demands
The move toward mechanised and automated mining brings fresh challenges. Diesel particulate matter, concentrated production zones, and higher energy use all increase airflow requirements. Simultaneously, tele-remote and autonomous operations demand stable underground conditions to keep machinery and sensors functioning reliably.
Technology is playing an increasingly central role. Dr Chikande observes that larger mines are turning to real-time environmental monitoring, automated airflow controls, and integrated sensor networks. Even smaller operations can benefit from low-cost monitoring tools and structured airflow management to improve safety and efficiency.
Strategic Planning for the ‘Life of Mine’
Ventilation infrastructure is capital-intensive and difficult to relocate, yet mining layouts evolve constantly as ore bodies shift. Proactive planning is essential.
“Regular updates to ventilation models, involving specialists in strategic mine planning, and progressive expansion of infrastructure can prevent costly retrofits,” says Dr Chikande.
Smaller operations can achieve flexibility through modular fans and staged airway development, allowing systems to adapt as the mine grows.
Energy Efficiency: The Bottom Line
Ventilation is a major energy consumer, sometimes accounting for nearly half of the total power consumption in deep mines. Rising energy costs and sustainability pressures have put efficiency at the forefront. Mechanised operations are adopting technologies such as variable speed drives (VSDs) and ventilation-on-demand (VoD) systems, while conventional and artisanal miners are encouraged to focus on simple, well-planned airflow strategies.
Dr Chikande concludes that across all mining sectors, the challenge remains the same: ventilation must shift from reactive compliance to a core component of strategic mine planning. Without this shift, safety, productivity, and operational viability remain at risk.
