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IronRidge Resources Ltd (LON:IRR) has released the results of a scoping study for the Ewoyaa lithium project in Ghana. The group said the study supports the case for a two million tonnes per annum production operation with life of mine revenues exceeding US$1.55bn, and significant potential to extend mine life. During the eight-year mine life the project will produce an average of 295,000 tonnes per year of 6% Li2O spodumene concentrate. The internal rate or return stands at 125%, while the capital cost estimate is USS$68mln. Average underlying earnings (EBITDA) will ring in at US$105mln per annum, the company added.