After more than 32,000m of drilling since March 2017, focused mostly on Lafigué, the company delineated a maiden indicated resource of 6.8 million tonnes at 2.25g/t gold for 494,000 ounces, and an inferred resource of 3Mt at 2.25g/t gold for 225,000oz.
It had been building towards the milestone, releasing positive drill results in late September.
Endeavour said the maiden resource estimate included around two-thirds of the total mineralised area defined to date, with the mineralisation remaining open at depths towards the southeast, east and north-east.
According to the company, preliminary metallurgical test work suggested the potential for high gold recovery rates.
A recent gold-in-soil geochemical campaign, structural mapping and ground/airborne geophysics campaigns also identified 14 nearby targets, with the company having already started a further 45,000m drill programme focussing on Lafigué and testing the new targets.
It said it expected to release an updated resource estimate in late 2019.
Endeavour executive vice president exploration and growth Patrick Bouisset said the maiden resource demonstrated the prospectivity of Fetekro and a second exploration campaign at the Lafigué target had been launched quickly to convert the inferred resources and extending the outlined resource.
"Based on the initial analysis of the ore characteristics and orebody shape, we believe it could be amenable to open pit mining as mineralisation starts at surface while the preliminary metallurgical test work done suggests the potential for high gold recovery rates," he said.
Bouisset added the additional identified targets supported the belief that Fetekro had the potential to become a new stand-alone project, with CEO Sébastien de Montessus agreeing the maiden resource was one step closer to Endeavour's aim of identifying a new project as part of its five-year exploration strategy set in 2016.
Endeavour's shares rose 1.25% Monday to C$21.07 (US16.08c).