Question:
Which sampling method is most commonly used for grade control in open-pit mining during production?
Which sampling method is most commonly used for grade control in open-pit mining during production?
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RC drilling is widely used for
\[
\boxed{\text{Production grade control in open-pit mines}.}
\]
Updated On: Jul 14, 2026
- Channel sampling
- Reverse circulation drilling
- Grab sampling
- Bulk sampling
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The Correct Option is B
Solution and Explanation
Step 1: Recall the purpose of grade control.
Grade control requires rapid, representative sampling of the ore before blasting and excavation.
Step 2: Identify the preferred sampling method. Reverse circulation (RC) drilling provides fast, reliable, and representative chip samples, making it the standard method for production grade control. Hence, \[ \boxed{\text{Reverse circulation drilling}} \] is the correct answer. Therefore, \[ \boxed{(B)} \] is the correct answer.
Step 2: Identify the preferred sampling method. Reverse circulation (RC) drilling provides fast, reliable, and representative chip samples, making it the standard method for production grade control. Hence, \[ \boxed{\text{Reverse circulation drilling}} \] is the correct answer. Therefore, \[ \boxed{(B)} \] is the correct answer.
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