Is openpit production scheduling "easier" than its underground counterpart?

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Bibliographic Details
Title: Is openpit production scheduling "easier" than its underground counterpart?
Authors: O'Sullivan, D.1, Brickey, A.2, Newman, A.3
Source: Mining Engineering; Apr2015, Vol. 67 Issue 4, p68-73, 6p
Database: Applied Science & Technology Source
Description
ISSN:00265187