JNTU B.Tech IV Year MINE PLANNING Previous Question Paper (September - 2021 - R16)

Mine modelling is the process of creating a digital, three-dimensional representation of a mineral deposit, including its geological structure, grade distribution, and rock mass characteristics. It integrates data from drill holes, geophysical surveys, and geological mapping into a coherent spatial database.

Its importance in planning includes:

• Resource Estimation: Provides accurate calculations of ore tonnage and grade, which are fundamental for economic feasibility studies.
• Risk Mitigation: Allows for the identification of geological uncertainties and structural hazards before mining commences.
• Optimization: Enables the simulation of different mining sequences and pit designs to maximize the net present value (NPV) of the project.
• Operational Efficiency: Facilitates precise scheduling, equipment selection, and waste management strategies.

The methodology of mine planning is a structured, iterative process designed to convert a mineral resource into a profitable mining operation. The key steps are:

1. Data Collection and Validation: Gathering geological, geotechnical, and metallurgical data to build a reliable block model.
2. Economic Parameters Definition: Establishing cut-off grades, commodity prices, operating costs, and capital expenditure requirements.
3. Pit Optimization: Utilizing algorithms (such as the Lerchs-Grossmann or Pseudoflow) to determine the ultimate economic pit limit based on the block model and economic constraints.
4. Mine Design: Designing the physical layout, including haul roads, benches, ramps, and waste rock dumps, ensuring compliance with safety and environmental regulations.
5. Production Scheduling: Sequencing the extraction of ore and waste over the life of the mine to meet production targets and processing capacity.
6. Financial Analysis: Evaluating the project's viability through cash flow modeling, sensitivity analysis, and NPV calculation.
7. Review and Iteration: Continuously updating the plan based on actual operational performance and changing market conditions.