Reportedly, the pilot elected to land in a mountainous area in calm wind conditions. At an estimated distance of 350 ft and an altitude of approximately 75 ft above the touchdown zone, the nose of the helicopter began a gradual left turn as the pilot applied collective pitch. At about the same time, he noted that the turbine outlet temperature (TOT) was rising and the main rotor RPM was decaying. There was a deep gorge ahead, so he made a left cyclic turn and lowered the collective in an attempt to reach a clearing. As he attempted to stabilize the helicopter, it started to rotate to the right and the rotor low RPM warning light came on. Subsequently, the helicopter settled into a juniper tree and rolled over onto its side. The air temperature and elevation of the crash site were 24 degrees Fahrenheit and 7,150 ft, respectively. A functional test of the engine revealed that it would operate within its limits. The control continuity could not be estimated due to separation of the tail boom push-pull tube. Reportedly, the main rotor and engine RPM needles had remained joined.