Mining core
Mine Surveying
5 self-contained study topics — notes, diagrams, formulas, and worked examples for exams and GATE.
Topics
- Survey Instruments for MinesMine surveying converts slope measurements into plan coordinates using zenith-angle reduction and azimuth-based ΔN/ΔE components. Total stations, GNSS, and gyro-theodolites are standard in Indian open-pit and underground mines per DGMS survey requirements.
- Underground TraverseUnderground traverses propagate coordinates through headings and distances; closure error e = √(ΔN²+ΔE²) measures misclosure, and Bowditch adjustment distributes it proportionally to leg lengths. Gyro azimuth and plumb transfers anchor the underground network to surface control.
- Levelling and ContouringLevelling computes reduced levels via RL₂ = RL₁ + BS − FS; gradient G expresses rise or fall as percentage. Contours at chosen interval map pit topography and orebody geometry for reserve and scheduling work.
- Volume ComputationsMine volumes use prismoidal, trapezoidal, or strip methods on survey cross-sections; tonnage follows as volume × bulk density. Open-pit progress, stockpile inventory, and reserve statements all depend on consistent section spacing and area computation.
- Mine Plan PreparationMine plans at statutory scale tie mine-grid coordinates to extraction boundaries, sections, and workings for DGMS submission. Section spacing and scale 1:n govern map accuracy and volume reliability; digital twins integrate CAD/GIS for live planning.