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Vic police ramp up search for missing mum

AAP logoAAP 18/12/2016 Julian Drape

Dams have been drained and farmland searched metre by metre as police ramp up their search for missing Melbourne mum Karen Ristevski.

Emergency crews searched farmland, grassland, wooded areas and creeks near Gisborne and Toolern Vale on Monday as the investigation into Ms Ristevski's suspicious disappearance drags into a sixth month.

Detective Inspector Stephen Dennis says Monday's search was "the most significant we've conducted to date".

"We are confident that we will find out what happened," he told reporters at the search site.

"We will be here for as long as it takes to search the area."

Ms Ristevski, 47, has not been seen since June 29 when she reportedly left her Avondale Heights home after an argument with her husband Borce.

She hasn't used her bank accounts or phone since.

Det Insp Dennis refused to comment on whether Borce Ristevski was being co-operative and wouldn't reveal what prompted Monday's search.

"There has been ongoing discussions with various members of the family," he said.

The detective said Christmas would be "extremely tough" for Ms Ristevski's family.

"Karen has been missing for just on six months," he said.

Detectives, search and rescue crews, the mounted branch, the air wing, uniform members and the dog squad, including a cadaver dog from NSW, all took part in the search.

SES volunteers also focused on land between Blackhill and Gisborne roads.

Eerily, Blackhill Road is where convicted murderer Adrian Bailey buried the body of Jill Meagher in a shallow grave in 2012.

Victoria Police say they'll continue the search on Tuesday.

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