Seems Jemrock had issues with Sandvik mining early last year that went through the courts. An insolvency notice was issued 13th March 2018.
https://insolvencynotices.asic.gov.au/browsesearch-notices/notice-details/Jemrok-Pty-Ltd-154278092/44064b46-0bdd-4696-996f-29be633c63d8