Like other Australian aboriginals, the Yir Yoront group which lives at the mouth of the Coleman River on the west coast of Cape York Peninsula originally had no knowledge of metals. Technologically their culture was of the old stone age or paleolithic type. They supported themselves by hunting and fishing, and obtained vegetables and other materials from the bush by simple gathering techniques. Their only domesticated animal was the dog; they had no cultivated plants of any kind. Unlike some other aboriginal groups, however, the Yir Yoront did have polished stone axes hafted in short handles which were most important in their economy.
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Lauriston Sharp (1952) studied this question.