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The value of the contract is US$95.1 million, which will be spread across FY19, FY20 and FY21.
Lycopodium said it did not expect the award to have a material impact on earnings this financial year.
The contractor previously completed Perseus' Sissingué gold mine and the definitive feasibility study and front-end engineering and design for Yaouré.
The FEED study confirmed capital costs of $263 million.
At a $1250 an ounce gold price, the project has an internal rate of return of 27% and a 32-month payback period.
It is expected to produce 215,000 ounces of gold per annum at all-in sustaining costs of $734/oz in the first five years.
A subsequent scoping study confirmed the potential for an underground mine, based on an underground inferred resource of 595,000oz at 6.2 grams per tonne.
Shares in Lycopodium dropped 1.6% to A$4.83, while Perseus was up 1.7% to 41.7c.
