A teenager has ridden a motorbike for 20 kilometres with a broken leg to get help for his unconscious friend, who was stuck in a ditch south of Mount Isa.

The group of three teenagers were riding on a track south of the town on Sunday, when two of them were involved in a crash at an old granite mine, known locally as "the granites", which has no mobile reception.

After the crash, the uninjured friend remained at the scene with the second boy who was unconscious while the 17-year-old with a broken leg raised the alarm.

Queensland Ambulance Service (QAS) North West Superintendent Brad Hardy said emergency services received a call at 2:00pm on Sunday, about two hours after the crash.

"QAS and QPS started searching the area and we had assistance from some local motorbike riders and some other people," Superintendent Hardy said.

"We eventually utilised a rescue helicopter to search the area."

Superintendent Hardy said emergency services were able to find the two remaining teens.

The teenager who had been unconscious was found with broken ribs and two broken wrists.

Both teenagers were flown to the Mount Isa hospital in a stable condition.

Need for pre-planning

Superintendent Hardy said the incident was a reminder for anyone who planned to leave the town to let family or friends know where they were going and expected to return.

"Even more importantly, you can get EPIRBs [Emergency Position Indicating Radio Beacon] these days that fit in your pocket or are just on your bike.

"If you do have a crash and you can't move or raise alarm, just press the EPIRB button and it will send a signal out and bring emergency services directly to you."

Superintendent Hardy said while EPIRBs were popular in coastal towns with boats they were less common in outback areas.

"They can send out rescue anywhere in Australia, any location," he said.