APCOM 77 : papers presented at the 15th International Symposium on the Application of Computers and Operations Research in the Mineral Industries Brisbane, Australia 4th-8th July 1977 : sponsored by the Australasian Institute of Mining and Metallurgy, Australian Computer Society, [and] The Australian Society for Operations Research. (Symposia series (Australasian Institute of Mining and Metallurgy) ;, 1977)