A search and rescue is underway to locate a 78-year-old woman missing from Moorfield at Blackall.
Muriel Macdonald was last seen by family at a Ravensbourne Road property spanning more than 3, 200 hectares at 2pm yesterday.
Police and family hold concerns for her wellbeing as she suffers from a medical condition.
A search involving more than 20 people including State Emergency Service volunteers, government agencies, police and local residents have been attempting to locate the woman today.
Two helicopters and four trail bikes are also assisting.
The woman is described as Caucasian, around 160cm in height, of a solid build, with grey hair and dull blue eyes.
Anyone with information about her whereabouts is urged to contact police.