A 3rd party contractor had arrived to drop off a new forklift (FLT) and collect a de-hired 3-ton FLT from the yard and workshops area in Yibal. At the time of arrival of the truck and low-bed trailer with the replacement forklift on the trailer they reported to CPDS yard coordinator and discussed the requirement of a larger loader for the off and on loading of the FLTs. The yard coordinator decided to have a supervisor from the near by hoist come to make an assessment for the safe off loading and loading. The driver and forklift operator were told that assistance was coming, and they were to wait. Whilst waiting for supervision and coordination for loading, the 3rd party FLT operator decided to offload by baking down the new forklift off the trailer on one ramp only and then attempted to drive the other FLT onto the trailer. The FLT slipped off the side of the loading ramp and landed on the ground. The operator jump clear of the falling unit, though suffered an ankle injury in the process