The hikers also spotted torn clothing and blood. They immediately hiked back and alerted staff park.
Rangers in a helicopter spotted a large male grizzly bear sitting on the hiker's remains, which they called a "food cache" in the underbrush about 100 to 150 yards from the site of the attack on Friday.
Investigators examined the bear's stomach contents, looked at White's photos and used other tests Saturday evening to confirm that it was the animal that killed White, park officials said in a statement Saturday night.
White's remains were recovered Saturday evening and were being sent to the medical examiner in Anchorage.
There's no indication that the man's death was the result of anything other than a bear attack, investigators said, adding that it's the first known fatal mauling in the park's nearly century-long history.
"Over the years, and especially since the 1970s, the park has worked very diligently to minimize the conflict between humans and wildlife in the park," said Anderson.
"We have some of the most stringent human-wildlife conflict regulations in the National Park system, and I think those are largely responsible for the fact that there hasn't been a fatal attack."
Denali is located 240 miles north of Anchorage. It spans more than 6m acres and is home to numerous wild animals, including bears, wolves, caribou and moose.
Intellpuke: You can read this Associated Press article, filed from Anchorage, Alaska, in context here: www.guardian.co.uk/world/2012/aug/26/hiker-killed-grizzly-bear-alaska