MELBOURNE (REUTERS) - Global miner Rio Tinto said on Friday (Feb 5) that it should have better communicated to an Australian aboriginal group whose ancient rock shelters it destroyed of a leadership change that affected efforts to mend their relationship.

The destruction last year of the 46,000-year-old Juukan Gorge rock shelters, while legal, sparked a public and investor uproar that led to the resignation of then chief executive officer Jean-Sebastien Jacques and two deputies.

The miner has since worked to repair ties with the Puutu Kunti Kurrama and Pinikura (PKKP) people, but the group expressed concern this week that it had not been informed that the leader of Rio's reconciliation effort would be moving to a new role.

The group had been promised by Rio Tinto chairman Simon Thompson that acting head of iron ore Ivan Vella would lead Rio's repair effort and stay on until ties were mended, the PKKP Aboriginal Corp chief executive told the company in a letter published by The Australian newspaper.

Rio Tinto announced a reshuffle last week, moving Mr Vella to run its aluminium business in Canada, while marketing chief Simon Trott is to assume the iron ore role that the miner says has responsibility for the relationship.

The PKKP was concerned that frequent leadership changes stopped them from building longstanding relationships of trust with Rio Tinto executives, the paper reported.

"Rio Tinto accepts that it should have communicated the recent executive changes to the PKKP in a more collaborative way," Rio Tinto and the PKKP said in a joint statement.

The PKKP said it found out about the changes only through the media, and were upset that Mr Thompson had not made any formal contact to explain their impact on the reconciliation process, The Australian reported.

Rio Tinto's management of the disaster has shone a spotlight on its board, at a time when many investors are demanding better standards of social, environment and corporate governance.

"The PKKP acknowledges that it was not the intention of the Rio Tinto chairman Simon Thompson to mislead the PKKP Board and the Elders at the joint board meeting," the statement said.

"We jointly recognise that in any relationship, mistakes are going to be made and it is how we work through these that informs the strength and depth of the ongoing relationship."