The Ganji quarry is located in Tsukumi City, Ooita Prefecture. This quarry mainly supplies limestone for cement material to Ooita Plant which is one of the biggest cement plant in our company and produces other various limestone products for steel industry, chemical industry, construction industry, etc.
This quarry has two production systems of No.1 and No.2. The No.1 production system produces cement material for Ooita Plant and the No.2 production system produces other products for our customers. We reconstructed its underground processing plant and for rationalization unified two control centers from the year 2001 to 2005.
This report presents the background and outline of this reconstruction.