Police investigating the disappearance of Western Australian man Dean Patrick White, have been confronted with a mystery that is stretching across the nation.

Mr White, better known as ‘Whitey’, is 55 years old and was last seen in Quairading, in WA's Wheatbelt, on March 31 last year.

Described as someone who is easy-going and placid, his family is urging anyone with information to contact the police.