The NSW Department of Planning and Environment approved modification 14, allowing the plant to be expanded from 7.5 million tonnes per annum to 9.8Mtpa.
The modification also allows for the implementation of a secondary crushing circuit and the development of an integrated waste landform to store tailings.
While a feasibility study is still being finalised, the cost of the plant expansion is expected to cost around A$40-45 million.
The expansion will also target a drop in unit costs of 10-15%.
The company had been hoping for approval by the March 2019 quarter and the earlier approval allows it to potentially bring forward its own internal approvals for the project.
Evolution executive chairman Jake Klein said the approval was a significant step...