Dust plan shall be maintained in every mine having working below ground plan on a scale having representative factors of not less than . . . . . . . . clearly, showing by distinctive colours, code letters and numbers.
A. 500 : 1
B. 1000 : 1
C. 1500 : 1
D. 2000 : 1
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Legislation And General Safety
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