Georgia Loney and Sam Tomlin One of Western Australia's two remaining coal mines is set to cut jobs and production, citing slowing demand for coal-fired power as a key factor. Premier Coal, which employs an estimated 500 workers at its mine near Collie, some 160 kilometres south of Perth, announced the reduction in its operations in a statement released on Tuesday afternoon. The ABC understands between 70-100 jobs will be impacted by the cuts.