The incident occurred last month near the Nammuldi iron ore mine, about 60 kilometres north-west of Tom Price.
Rio said photos taken before and after the blast showed a large rock and a scrub tree had fallen from an overhang above the cave entrance.
Rio Tinto said initial assessments taken by a drone had found no structural damage at the Nammuldi site, or any apparent impact on cultural materials.
Production of LME deliverable KAS-branded aluminium at Kazakhstan’s Eurasian Resources Group has reached the four-million-tonnes milestone
