Explorer Thor Heyerdahl collected many items in his effort to prove South American migration theory

This article is more than 1 year old

This article is more than 1 year old

Norway has agreed to hand back thousands of artefacts removed from Easter Island by the explorer Thor Heyerdahl during his trans-Pacific raft expeditions in the 1950s.

An agreement was signed by representatives of Oslo’s Kon-Tiki Museum and officials of Chile’s culture ministry at a ceremony in Santiago as part of a state visit by Norway’s King Harald V and Queen Sonja.

The museum pieces include carved artefacts and human bones from the Rapa Nui, the first inhabitants of the remote Chilean island in the Pacific.

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“Our common interest is that the objects are returned and, above all, delivered to a well-equipped museum,” said the museum’s director, Martin Biehl. He warned, however, that the repatriation process would take time.

Heyerdahl’s family said he had long wanted to return the pieces he collected in expeditions in the mid-1950s and mid-1980s, currently exhibited in the Oslo museum.

The signing ceremony was also attended by Thor Heyerdahl Jr, who accompanied his father on one of his expeditions to the island in 1955, when he was 17.

“The repatriation is a fulfilment of my father’s promise to the Rapa-Nui authorities, that the objects would be returned after they had been analysed and published,” he said.

Heyerdahl, an anthropologist and adventurer, became famous in 1947 when he and a crew of five crossed much of the Pacific on a balsawood raft, the Kon-Tiki.

Facebook Twitter Pinterest The Rapa Nui island community is demanding the return of one of the island’s monolithic statues, or moai, from the British Museum. Photograph: Paul Quayle/Alamy

He was seeking to prove his theory that the Polynesian islands could have been settled by prehistoric South American people, and not by settlers from Asia as most scholars believed.

Heyerdahl died in 2002 aged 87.

“The study of human remains – using DNA – could demonstrate a prehistoric contact between Rapa Nui and South America, which was the main thesis of my father,” Thor Heyerdahl Jr said.

“As a ministry, we have the mission to respond to the just demand of the Rapa Nui people to recover their cultural heritage,” Chile’s culture minister, Consuelo Valdes, said in a statement.

“Today, one more step has been taken through this historic agreement with Norway, which will enable the return of valuable cultural and symbolic pieces.”

The Rapa Nui island community is also demanding the British government return the Hoa Hakananai’a, one of the most spiritually important of the island’s moai, or monolithic statuesfrom the British Museum.

The moai was stolen from the island in 1868 by the captain of a British frigate and presented to Queen Victoria.

• This article was amended on 29 March 2019 because the Kon-Tiki was a balsawood raft, not a reed raft as an earlier version said.