The commission tasked with locating the remains of the Disappeared is due to complete work on a search site in the Republic in the next few days.
The search for the remains of Gerard Evans being carried out by the Independent Commission for the Location of Victims' Remains (ICLVR) is drawing to a close at the Carrickrobin site in Co Louth.
The Crossmaglen man was last seen hitch-hiking from a dance in Castleblaney in Co Monaghan in March, 1979. No-one has ever admitted responsibility for the 24-year-old’s death.
His remains have not yet been found, despite 18 months of painstaking searches in areas highlighted in information received by the commission.
Meanwhile, John McIlwaine, who leads the forensic archaeological team working alongside the ICLVR, told the BBC a new site was due to be examined. “We have another site to investigate in the north of Ireland shortly, once the clearance comes through,” he said.
The ICLVR is charged with the task of obtaining information which could lead it to the remains of those killed and buried in secret by terrorist organisations before April 10, 1998.
In June Mr McIlwaine led the team which discovered the remains of Charlie Armstrong (57) in Colgagh, Co Monaghan.
In 1981 Mr Armstrong, who was from south Armagh, went missing on his way to Mass. His body was discovered buried in a peat bog several miles from the border.