The Tribe — D.B. Reynolds-Moreton

Marooned on an uncharted Planet, Kal wanders the savage wilderness on the edge of survival until he stumbles upon The Tribe living in a cave, near extinction and threatened by the local wildlife.
Kal instigates the technical and cultural birthing of the tiny people which takes off at a breathtaking pace. But there is another technological force at play on the strange planet, a relic of some past civilisation, or something more current?