Abstract: The output production coefficient is a coefficient of mineral deposit which shows calculation ratio of the volume of mineral product to the volume of mine rock mass during a certain production period. In this study, we describe the methods to determine the output production coefficient for complex deposits. The solution of the task allows to optimize parameters of current plans of open mine rock works and will define the mode of mine work. Besides this coefficient will give some more detailed information about resources of opencast mine and its vulnerability. The calculation of this value characterizes the research of this opencast mine as a local criterion. In this connection, the task to develop some methods of the determination of output production coefficient is our current task for today.