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

Technical factors in mine planning are critical for ensuring safety, economic viability, and operational efficiency. The primary technical factors include:

• Geological characteristics: Detailed assessment of ore body geometry, thickness, dip, depth, and structural discontinuities, along with the physical and chemical properties of the ore and host rock.
• Geotechnical parameters: Rock mass rating (RMR), stress conditions, and stability analysis to determine appropriate support systems and slope angles for open pits or pillar dimensions for underground mines.
• Mine method selection: Choosing between open-pit or underground methods based on depth, stripping ratio, and ore body continuity.
• Production capacity and scheduling: Determining the optimal extraction rate based on equipment performance, lead times, and market demand.
• Infrastructure and logistics: Planning for haulage systems, ventilation requirements, power supply, drainage, and waste rock disposal sites.
• Mineral processing and recovery: Evaluating the metallurgical characteristics to ensure efficient beneficiation and high recovery rates.

A long-term approach in mine planning involves strategic decision-making that spans the entire life-of-mine (LOM), typically covering periods of 10 to 30 years or more. This approach focuses on maximizing the net present value (NPV) of the project while ensuring sustainable resource extraction.

Key components of the long-term approach include:

1. Strategic Reserve Estimation: Defining the total mineable reserves and establishing cut-off grades that remain economically viable over the long term despite market fluctuations.
2. Ultimate Pit or Mine Limit Design: Determining the final boundaries of the mine to ensure the most efficient extraction of the ore body while minimizing the stripping ratio.
3. Capital Expenditure (CAPEX) Planning: Phasing major investments in heavy machinery, processing plants, and site infrastructure to align with production milestones.
4. Environmental and Closure Planning: Incorporating progressive reclamation, tailings management, and final mine closure strategies from the early design stages to mitigate long-term environmental liabilities.
5. Flexibility and Risk Management: Building in contingencies for geological uncertainty, commodity price volatility, and regulatory changes to ensure the mine remains resilient throughout its operational life.