Questions
5 questions on average
Difficulty
Medium
Importance
Medium yield; focus on standard definitions.
Overview
Mine Surveying and Planning is a critical technical domain covering the accurate measurement, mapping, and projection of geological deposits for extraction. It forms the backbone of operational decision-making, ensuring safety and resource optimization in PSU mining projects.
Mine Survey Instruments
This section covers the precision tools used for establishing control points both on the surface and underground. Aspirants must focus on the specific application of instruments like Theodolites, Total Stations, and Gyro-theodolites in constrained mining environments.
- Gyro-theodolite: Essential for meridian determination in underground surveys
- Total Station: Integrates EDM and angular measurements for rapid data collection
- Laser Profiler: Used for volumetric analysis of stopes and tunnels
- Dumpy Level: Standard instrument for bench leveling in open-cast mines
Surface & Underground Surveying
Surveying techniques differ significantly between open-cast and underground environments due to visibility and geometric constraints. Understanding the transition from surface coordinate systems to underground networks is a common examination focus.
- Traversing: Primary method for establishing horizontal control in mine tunnels
- Correlation Survey: Techniques like Weisbach triangle or Direct Leveling to link surface to underground
- Triangulation: Used for large surface area control points
- Closure Error: Must be distributed proportionally to the length of the traverse legs
Reserve Estimation & Mine Plans
Estimation involves calculating mineral tonnage based on geological data, with plans serving as the statutory requirement for mine safety. Exams often test the calculation methods for volume and tonnage of ore bodies.
- Area of Influence Method: Classic technique for calculating mineral reserves
- Isopach Maps: Used to represent thickness variations of a coal seam or ore body
- Standard Scale for Mine Plans: 1:1000 or 1:2000 as per Coal Mines Regulation (CMR)
- Tonnage Factor = (Volume of Ore / Density) in cubic meters per tonne
GIS, Surpac & MineSight
Modern mining utilizes digital tools for 3D modeling and spatial analysis, which are increasingly appearing in technical sections of PSU exams. Familiarity with the basic workflow of these software packages is key.
- GIS: Combines spatial coordinates with attribute data for environmental management
- Surpac: Widely used for block modeling and geological database management
- MineSight: Focuses on mine planning, sequence scheduling, and pit design
- DTM (Digital Terrain Model): Core output for calculating overburden removal volumes
Formula Sheet
Tonnage = Volume * Bulk Density
Closure Error = Sum of observed angles - Theoretical sum
Volume = (Area 1 + Area 2) / 2 * Distance (Prismoidal formula)
Exam Tip
Focus on the specific function of the Gyro-theodolite and the standard scale ratios for statutory mine plans, as these are high-frequency 'memory-based' questions in PSU exams.
Common Mistakes
- Confusing the application of triangulation vs. traversing for different mining conditions.
- Neglecting the mandatory scale requirements for statutory mine plans defined in the Coal Mines Regulations.
- Incorrectly applying coordinate transformation formulas during surface-to-underground correlation.
More Revision Notes
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