📋 Case Study
Deep-Level Gold Mine BEME Fleet Transition (South Africa)
Extreme geothermal heat (>45°C), limited ventilation capacity, and high grid tariff volatility
🏗️ Project Overview
Transition of 24-unit LHD fleet at 3.2 km depth in Mponeng Mine
🎯 Challenge
Extreme geothermal heat (>45°C), limited ventilation capacity, and high grid tariff volatility
🔧 Design Approach
Hybrid opportunity charging + overnight depot charging; liquid-cooled battery packs with mine-water heat exchangers; dynamic load scheduling integrated with onsite solar microgrid
📐 Design Diagram
AI-generated project design illustration
📐 Key Calculations
Battery Thermal Margin
(Rated Max Temp − Ambient Temp) × Cooling Coefficient
Result: 12.3°C margin
Ensures <2% SoH loss/year
Ventilation Heat Load Reduction
Diesel Exhaust Heat − BEME Rejected Heat
Result: −820 kW
Enables 23% ventilation fan energy reduction
📊 Results
100% diesel displacement by Year 3; 37% lower OPEX; zero underground NOx emissions; 14-month ROI💡 Lessons Learned
- •Liquid cooling integration requires early collaboration with ventilation engineers
- •Real-time SoH telemetry reduced unscheduled downtime by 68%
- •Grid-tied solar + storage cut peak demand charges by 41%
✅ Key Takeaways
- 1Liquid cooling integration requires early collaboration with ventilation engineers
- 2Real-time SoH telemetry reduced unscheduled downtime by 68%
- 3Grid-tied solar + storage cut peak demand charges by 41%