A front-end engineering study confirmed capital costs of A$113 million, including 8% contingency, which was within 6.6% of last year's enhanced feasibility study.
Honeymoon has an internal rate of return of 47%, based on a uranium price of US$60 per pound.
The uranium spot price has strengthened in recent weeks and is currently trading at just below $60/lb.
The project is set to produce 2.45 million pounds of uranium oxide per annum at all-in sustaining costs of $25.60/lb.
"The planets are aligning perfectly for Boss and Honeymoon in every respect," Boss managing director Duncan Craib said.
"The FEED shows Honeymoon's costs are in line with the forecasts contained in last year's enhanced feasibility study, which is a superb outcome given the wider inflationary environment.
"These key findings come against a backdrop of significant increases in the uranium price and an exceptionally strong supply-demand outlook."
Earlier this month, Boss raised A$125 million to fund the Honeymoon restart.
Last year the company acquired 1.25Mlb of uranium for $37.7 million, or US$30.15/lb, which gives it flexibility during the restart.
A final investment decision will be made in early May, after which detailed engineering, procurement and construction works will begin.
First production is expected 12-18 months after the FID.
Shares in Boss were down 4.6% to A$2.19, valuing the company at $740.3 million. The stock has doubled over the past 12 months.
