Detectives are appealing for the public's help after receiving new information about one of WA's oldest cold cases.

They have released a description of a man who could have information about the disappearance of 12-year-old schoolgirl Lisa Mott 44 years ago.

Lisa went to play basketball with a friend at 6.45pm on October 30, 1980 at the courts on Throssell Street in Collie.

Two hours later, Lisa went to a nearby pizza shop at 8.45pm for about 15 minutes.

She was last seen crossing a railway line in Forrest Street before she got into a yellow panel van, believed to be a Holden 1970 to 1978 model.

She has not been seen or heard from since.

An eyewitness has told detectives she saw the schoolgirl talking to man, who appeared to know the 12-year-old, at the basketball courts the same e

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