Capital costs for the underground mine and plant modifications is forecast at around A$60 million, of which around $10 million will be spent this financial year.
The FY19 component was included in the $25-30 million major capital guidance for Mt Carlton.
The remainder of the capital will be spent between the 2020 and 2022 financial years.
Evolution will start the approvals process in the coming month with a view to deliver first underground ore in FY21.
The projects will allow production from the higher grade Link zone at Mt Carlton to be brought forward.
Additional drilling from underground is expected to expand the initial underground reserve of 280,000 tonnes at 7.2 grams per tonne gold and 0.64% copper for 65,000 ounces of gold and 27,000t....