King Solomon's Mines by H. Rider Haggard from Books In Motion.com

African explorer Allan Quatermain and his two companions aren't just searching for the fabled diamond mine of the Biblical King Solomon, deep in the heart of Africa, they are searching for a man. The trio braves long treks across parched, waterless deserts and the icy cold of the mountains. They survive wicked witchcraft and fierce tribes, only to be lured into an eerie stalactite cave of skeletons where they narrowly escape being buried alive in a tomb of diamonds with chests full of uncut stones, some as large as pigeon's eggs