Hi, OPEX of 360$ per tonne based on nameplate capacity of 6,000tpa or 500 tonnes per month. This puts BSM as one of the lowest cost producers of graphite in the world. Hope that helps.
Source, section 4.6 of this document (expected 180.000$ opex for 5 months)
http://www.asx.com.au/asxpdf/20170922/pdf/43mk2txgmmmdsp.pdf
