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SYDNEY, Aug 1 (Reuters) - Rio Tinto (RIO) CEO Jakob Stausholm said on Tuesday the global miner is focused on small, bolt-on acquisitions, not big purchases.

"I don’t think we need a big acquisition right now," Stausholm said at an event in Melbourne.

"What we are trying to do is a bit of smaller portfolio acquisitions ... that shapes the portfolio."

The Australian miner has already announced several small partnerships and deals this year, including the purchase of a 57.74% stake in the Agua de la Falda copper project in Chile announced on Monday.

Earlier in July, Rio Tinto agreed to buy a 15% stake in Australia's Sovereign Metals for A$40.4 million ($27.04 million) to help develop a rutile and graphite project in Malawi.

($1 = 1.4943 Australian dollars)