# Equipment Recommendation for Open-Pit Coal Mine ## 1. Mine Production and Overburden Details - **Annual ROM coal production target:** 8 million tonnes (Mt) - **Mine life:** 15 years - **Stripping ratio:** 5:1 (overburden: ROM coal) - **Overburden type:** Medium-hard sandstone loose soil cover--- ## . Total Overburden and Material Quantities ### Total ROM Coal Over 15 Years: \[ 8 \text{ Mt/year} \times 15 \text{ years} = 120 \text{ Mt} \] ### Total Overburden: \[ 5 \times 120 \text{ Mt} = 600 \text{ Mt} \] ### Total Material Movement: - **Total overburden + ROM coal:** 720 Mt --- ## 3. Equipment Selection Criteria ### Key factors: - **Productivity:** Match with annual targets - **Compatibility:** Excavator, loader, dump trucks - **Operating conditions:** Medium-hard sandstone, loose soil cover - **Flexibility:** Ability to handle variability and different working conditions - **Cost considerations:** Capital and operating costs --- ## 4. Recommended Equipment ### a) Excavation Equipment - **Type:** Hydraulic excavators - **Capacity:** 3,000–5,000 tonnes/hour - **Justification:** - High productivity for large volumes - Suitable for medium-hard sandstone with possible reliance on hydraulic digging power - **Example:** 100–150 tonne excavators (e.g., Komatsu PC200, Hitachi EX800) ### b) Loading Equipment - **Type:** Hydraulic shovels or backhoe loaders - **Capacity:** Match excavator size - **Justification:** - Efficient loading of dump trucks - Compatibility with excavator type ### c) Haulage Equipment - **Type:** Dump trucks - **Capacity:** 200–300 tonnes/truck - **Number:** Approximately 20–30 trucks, depending on cycle time - **Justification:** - Large capacity reduces number of trips - Suitable for long hauls - Compatible with excavator and shovel --- ## 5. Equipment Compatibility and Operating Conditions | Equipment Type | Capacity | Compatibility | Operating Conditions | Flexibility | Cost Consideration | |------------------|------------|-----------------|------------------------|--------------|-------------------| | Excavators | 100–150 tonne | High (matching large trucks) | Medium-hard sandstone, loose soil | High | Capital cost offset by productivity | | Dump Trucks | 200–300 tonne | Directly compatible with excavators | Medium-hard conditions | High | Operating costs balanced with cycle efficiency | --- ## 6. Summary of Recommended Equipment - **Excavator:** 1 x 150 tonne hydraulic excavator - **Loading shovel:** 1 x 150 tonne shovel (integrated with excavator) - **Dump trucks:** 20–30 trucks, 250 tonne capacity each --- ## 7. Justification - **Productivity:** Large-capacity excavators and trucks meet the annual production targets efficiently. - **Compatibility:** Equipment sizes are compatible for seamless operation. - **Operating conditions:** Hydraulic excavators handle medium-hard sandstone effectively. - **Flexibility:** Equipment can adapt to changing conditions and load variations. - **Cost:** High initial investment balanced by high productivity and lower cycle times, reducing operational costs over mine life. --- # Final Recommendation Use **large-capacity hydraulic excavators (100–150 tonnes), matching high-capacity dump trucks (200–300 tonnes),** to optimize productivity, ensure compatibility, and operate effectively under medium-hard sandstone conditions for the 15-year mine life.