Question

Match the drilling pattern with mining operation

• A. P→II,Q→III,R→I,S→II
• B. P→III,Q→IV,R→I,S→II
• C. P→II,Q→I,R→IV,S→III
• D. P→III,Q→IV,R→II,S→I

Hint:

Drilling patterns are identified by shape: fan cuts for drifting, burn cuts for shaft sinking, ring patterns for stoping, and symmetric longhole patterns for raising.

Answer 1

The Correct Option is D

Pattern P: Fan-shaped drilling is characteristic of drifting or tunnel development. Among the given, Pattern P matches III only in option logic.
Pattern Q: The shown burn-cut pattern (plan and side view) is typical of shaft sinking. Hence Q corresponds to IV in the matching choices.
Pattern R: The ring-shaped drilling pattern is used in sublevel stoping, aligning with II.
Pattern S: Symmetric longhole drilled rectangular raise pattern corresponds to drop raising, matching I in the answer structure.
Thus the correct mapping is:
\[ P \rightarrow III,\quad Q \rightarrow IV,\quad R \rightarrow II,\quad S \rightarrow I \] Final Answer: P→III,Q→IV,R→II,S→I