Samples taken by KORES from a small section at Kochang indicated an indicated and inferred resource of 113,000oz compared to Bluebird’s 117,000oz.
Grades recorded by KORES were higher at 6.55 g/t gold and 35.97 g/t silver.
Colin Patterson, Bluebird’s chief executive, said: "It is always pleasing to see corroboration of one's technical work. These results reinforce our opinion that Kochang has a good deal of life left in it.”
Kochang is one of two mines Bluebird aims to re-open by the end of 2019.
An application for a permit to develop Gubong, also in South Korea, was submitted on 23 January.