US Mine Safety and Health Administration spokeswoman Amy Louviere told ILN the five planned boreholes had been drilled, and a camera lowered into them registered smoke at varying levels.

“One borehole, where the temperature registered 100-105F, is believed to be closest to the fire,” she said.

While efforts were expected to continue throughout the weekend, as of Friday afternoon MSHA estimated that 1.2 million gallons of water had been pumped into the mine at an estimated 125,000 gallons of water per shift.

Consol spokeswoman Lynn Seay added in its update for ILN that a sixth borehole was planned and work to get it drilled was to begin late Friday night.

She also confirmed the borehole cameras were dropped at a total of three locations on Friday.

“[Our] personnel were able to determine airflow in different sections of the mine and have narrowed the possible location of the heat source,” Seay said.

She said the pump and water line company and federal officials were working on to support the operations were in place and testing for them was complete.

A second was being set up Friday afternoon in hopes of coming online Friday evening.

“Consol Energy’s team remains on-site around the clock to continue monitoring the situation,” Seay said, adding that a timeframe for the resumption of operations was unknown.

Consol evacuated its 121 day crew miners Tuesday afternoon at about 2pm local time after smoke was seen coming from the shaft of the mine in Wayne, near the Pennsylvania-West Virginia border.

No injuries have been reported.

No cause has yet been released, and while officials said earlier this week they have determined the location of the fire that information has not been released.