DPM Metals (ASX:DPM) said Bosnia and Herzegovina's Constitutional Court ruled that the 2013 concession agreement and annexes I through VI supporting its Vares project were not compliant with constitutional requirements governing state-owned forests and forestry land, according to a late Thursday statement by the company.

The Court neither terminated nor suspended the concession, and operations in Vares continue as normal, the company said.

Authorities have six months to review the challenged acts and take corrective measures, while the company said it would work constructively with the relevant authorities and the Attorney General's Office to ensure compliance, the company added.