ExamVeda
Login
Home

The average vertical stress in a coal pillar of a B...

This question belongs to Mining Engineering Introduction To Mining Engineering
Introduction to Mining Engineering
?

The average vertical stress in a coal pillar of a B & P panel is found to be 8 MPa. The depth of the pillar and the average density of overburden rock are 200 m and 2500 kg/m3 respectively. Assuming pillar stress to be the same in all coal pillars of that panel, the extraction ratio of the panel is

Answer & Solution
Correct Answer: Option A
Let's discuss the solution. Join the discussion
Examveda
Question posted by Examveda
Community

Join the Discussion

No comments yet Be the first to discuss this question.
Keep Learning

Related Questions on Introduction to Mining Engineering

When the occurrence of mineral (e.g. rare minerals) is randomly distributed in a rock then which of the distribution pattern is statistically followed?
A. Normal distribution B. Skewed distribution C. Lognormal distribution D. Poisson distribution
Which of the following combination of SDL based mining is expected to give best production and productivity of SDL?
A. 3 level heading district B. 4 level heading district C. 5 level heading district D. 6 level heading district
It is very difficult to control shaley roof if coal is not left with the shale why?
A. It is weak in nature B. It has weathering effect C. It has great affinity to absorb moisture and get departed from immediate roof D. It reacts with coaly surface
In connection with lowering or raising of persons by means of bucket etc. for a shaft exceeding "A" m in depth, there shall be significant cover overhead for protection from things falling down the shaft. A is given by
A. 130m B. 190m C. 270m D. 500m
More Related Questions on Introduction to Mining Engineering