Associated Press
The devastation brought about by Friday\'s flash flooding in Cagayan De Oro, southern Philippines, is shown on Thursday Dec. 22, 2011. A landslide buried dozens of people Thursday at a small-scale gold mining site in the southern Philippines.

MANILA, Philippines — A landslide buried dozens of people Thursday at a small-scale gold mining site in the southern Philippines, leaving at least 25 dead less than a month after heavy rains hit the area.

The landslide struck around 3 a.m., when most residents were asleep. Aside from those confirmed dead, more than 100 people are believed to be buried in the rubble in Napnapan village in Pantukan township, Compostela Valley provincial Gov. Arturo Uy said.

Army Lt. Col. Camilo Ligayo said about 120 soldiers were heading to the area to help dig for survivors and bodies.

Saul Pingoy, a local resident, told DZMM radio that he was sleeping in a house about 50 yards (meters) away from the landslide when he felt the ground shake and heard rocks falling on roofs. It wasn't raining at the time, he added.

"The mountain itself was already sending a warning with falling rocks. That's why we were woken up ... and then it collapsed," he said. "Big boulders and the ground from the mountain covered the area."

Compostela Valley province is on the main southern Philippine island of Mindanao, where flash floods triggered by a tropical storm killed more than 1,250 people in December.

Uy said miners and their families had been warned that the heavy rains made the small tunnels that honeycomb the hills and mountains more dangerous.

Thousands of poor Filipinos dig and pan for gold in the area, hoping to strike it rich despite the dangers of largely unregulated mining. The tunnels are often unstable and landslides and accidents are common.

Uy said authorities advised residents as early as Dec. 16 when Tropical Storm Washi was sweeping across Mindanao to leave their tunnels, "but unfortunately some have not responded to our advisories."