The incident is reported to have taken place in  Enga Province, which is densely populated and located near the Porgera gold mine operated by Barrick Gold, a company based in Canada, in collaboration with Zijin Mining, a Chinese group.

It is an area of remote and difficult jungle terrain, in a country of around 12 million people that sits just north of Australia.

Tropical and divided along tribal, ethnic and linguistic lines, Papua New Guinea is rich in natural resources but largely underdeveloped, making it especially vulnerable to natural disasters, which strike frequently.

U.N. officials have been closely monitoring the situation. And with the latest estimate in hand, they emphasized that the need for assistance would be long-term and complicated.

“This situation necessitates immediate action and international support to mitigate further losses and provide essential aid to those affected,” said Anne Mandal, a spokesperson for the U.N.’s International Organization for Migration.

Over the weekend, the agency estimated that, on top of the toll of dead and missing, more than 250 houses had been abandoned as residents feared additional slippage, with roughly 1,250 people displaced.

Just getting to survivors has proved to be an enormous challenge. An aid convoy reached the area on Saturday afternoon to deliver tarps and water, but no food.

On Sunday, the local government secured food and water for around 600 people, according to the U.N., but heavy equipment still had not made it through, leaving people to search for bodies on dangerous, unstable debris using small shovels and pitchfork, reports New York Times.