Land Search and Rescue volunteers from Greymouth, Hokitika and Westport responded, including a LandSAR dog team and cave search team.
A Greymouth rescue helicopter assisted search efforts from the air, and the Department of Conservation provided expert local knowledge.
Members of the public also provided valuable assistance in the early stages of the response, mobilising quickly to aid the search effort.
The boy was unharmed during the incident and has been reunited with his relieved family.
Police said in a statement they are grateful for the efforts of the local community and LandSAR volunteers.