Police and Donovan’s family would remain in contact with locals in the area who had knowledge and experience of the area, he said.
Donovan is known as a highly respected and experienced member of the tramping community.
Police want to hear from anyone with information that could help in locating Donovan, if it has not yet been reported. Calls to police can be made on 105, referencing file number 240326/8540, or information could be left on the police website.