Documents A Comparative Study of Various Empirical Methods to Estimate the Factor of Safety of Coal Pillars

American Journal of Mining and Metallurgy, 2014, Vol. 2, No. 1, 17-22 Available online at http://pubs.sciepub.com/ajmm/2/1/3 © Science and Education Publishing DOI:10.12691/ajmm-2-1-3…