Perenti's (ASX:PRN) underground mining unit, Barminco, will conclude operations at the Khoemacau Copper Mine in Botswana when its current contract ends on June 30, according to a Tuesday filing with the Australian bourse.

Barminco will work with Khoemacau Copper Mining, a subsidiary of resources company MMG, to support the handover process, the filing said.

Under the contract terms, all equipment at the site will be sold to MMG at the end of the agreement, the filing added.

The final sale value will be determined using a pre-agreed formula, the company said.