Certificate In Strata Control - Coal Exam Practice Questions - Certificate In Strata Control - Coal (South Africa) Exam

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What is the areal extraction ratio e for a square bord and pillar panel where pillar width w = 18 m and bord width B = 6 m?

43.75% 25.00% 56.25% 33.33%

Correct Answer:

43.75%

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