Blackrock Mountain?

http://www.canadasmountains.com/blackrock_mountain.htm

From Wikipedia:
Blackrock Mountain (also spelled Black Rock Mountain) is a mountain on the eastern fringe of the Canadian Rockies in Alberta, Canada.

It is located on the north-eastern edge of Kananaskis Country, almost directly west of Calgary. It stands approximately 5 kilometers (3 mi) east of the Central Front Ranges, and is part of the Ghost River Area of the East Banff Ranges.

The mountain is a popular hike for locals, as it offers an unimpeded view of the prairies. A lookout was built by Alberta Forest Service on the summit in 1929, and was in service until 1959.

Blackrock Mountain was named in 1958 for its black appearance, particularly from the east.

Paper you found in bunker...