Fire and Rescue NSW crews from Narrabri, the local Volunteer Rescue Association (VRA), paramedics, police and wildlife services were all called to Mount Kaputar at the weekend, after a group of bushwalkers raised the alarm that a man was injured.

The VRA took to social media to confirm the "complex" rescue operation took about four hours, before volunteers were trekking back down the mountain knowing the patient was being transferred to hospital.

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"The first couple of sections was slow and hard going. Some steep, narrow paths made it difficult. We were able to maintain safety through the use of bellays and anchors," a VRA statement on social media said.

Narrabri firefighters answered calls for help, to provide "fresh arms and legs" and additional supplies to rescue crews.

"NSW Police requested our assistance [two] hours into the original incident due to the complexity and location," a statement from Narrabri Fire and Rescue NSW said.

"[The rescue] involved extricating the injured male utilising a [specialised stretcher] and walking approximately 1.5 kilometres across rocky, mountainous terrain to an awaiting ambulance.

"Enroute, crews were requested to supply additional drinking water to the already committed emergency service crews tending to the the patient who were awaiting extra resources to complete the extrication."

It is understood the man was taken to hospital by ambulance for treatment.