Jakarta, Indonesia (CNN) Hopes for the survival of about three dozen miners trapped in a collapsed illegal gold mine in Indonesia have severely diminished as oxygen levels at the site fall.

"There is no hope for survivors. (It's assumed all have) passed away," said Feri Arianto, of the Public Relations of the National Search and Rescue Agency (Basarnas).

The rescue mission will not attempt to add oxygen into the tunnels, in the Bolaang Mongondow area on the island of Sulawesi, which collapsed after a landslide on Tuesday.

Eight miners had died and 27 had been rescued from the site, as of 12 p.m. Friday local time (12 a.m. ET), according to Arianto. One man had been rescued alive and died on the way to hospital, he added.

Indonesian Search And Rescue Agency (BASARNAS) rescuers evacuate a survivor from a collapsed gold mine in Bolaang Mongondow, North Sulawesi, Indonesia.

Arianto explained that it was hard to confirm exactly how many people remained in the mine as many of the men were not locals.

Read More