A Canadian oil and gas company has decided to halt a huge concession in the Peruvian Amazon which was seen as a threat to uncontacted indigenous tribes.

Pacific Exploration and Production, who began its first phase of oil exploration back in 2012, was previously awarded the right to explore for oil in a large area of the region which contains massive biodiversity. It is thought to be home to more uncontacted tribes than anywhere else in the world.

The concession, referred to as Lot 135, includes around 40 per cent of the Sierra del Divisor national park which was founded back in 2015.

The concession, which stretches for more than one million hectares and is estimated to hold prospective deposits of almost one billion barrels of oil, has sparked massive resistance in Peru and its neighbour Brazil for many years.

Oil exploration requires continued and consistent invasion of land which has the ability to drastically increase the risk of forced contact with uncontacted tribes. It makes the tribes more likely to experience violence from outsiders who commandeer their land and resources and vulnerable to illnesses such as flu and measles which they have no resistance towards.

The firm’s decision to pull the concession was first revealed by Survival International, an NGO based in the UK. In a letter dated 13 March 2017, Institutional Relations and Sustainability Manager Alejandro Jimenez Ramirez told the charity the company would be relinquishing its exploration plans. The last day of Pacific’s contract is said to have been 17 March.

“As you may know, the company has a new management and post evaluations of current opportunities, it has made the decision to relinquish its exploration rights in Block 135 and return the block to Perupetro [the Peruvian state entity responsible for establishing concessions and contracting companies] effective immediately,” he said.

In pictures: The uncontacted tribes of the Amazon Show all 7 1 /7 In pictures: The uncontacted tribes of the Amazon In pictures: The uncontacted tribes of the Amazon A group from the Mashco Piro people in Peru, photographed from a distance by the Madre de Dios river Survival International In pictures: The uncontacted tribes of the Amazon Uncontacted Brazilian people, photographed from the air Survival International In pictures: The uncontacted tribes of the Amazon Uncontacted Brazilian people, photographed from the air Survival International In pictures: The uncontacted tribes of the Amazon Uncontacted Brazilian people, photographed from the air Survival International In pictures: The uncontacted tribes of the Amazon Uncontacted Brazilian people, photographed from the air Survival International In pictures: The uncontacted tribes of the Amazon Uncontacted Brazilian people, photographed from the air Survival International In pictures: The uncontacted tribes of the Amazon Uncontacted Brazilian people, photographed from the air Survival International

“To date legal processes are underway. . . [W]e wish to reiterate the company’s commitment to conduct its operations under the highest sustainability and human rights guidelines, avoiding damages to cultures and their surroundings; a value promise we feel remains intact.”

While the decision has been hailed as a significant victory by campaigners, the Toronto-listed company has in the past been insistent about the fact they halted plans because of financial concerns.

David Frietas from Regional indigenous federation ORPIO told The Guardian the decision was “good news” but warned that the concession is still in existence and a different company could be brought into embark on oil exploration instead.