UPDATE: Chief Mountain Leased for Oil Drilling It's official, according to Bureau of Indian Affairs (BIA) records, the sacred Chief Mountain on the Blackfeet Indian Reservation, has been leased for oil and gas drilling. Back in May of 2013 the BIA approved leases to all of the Blackfeet controlled lands on the reservation, around Chief Mountain. I cant say whether the area will be drilled, but it is now under a 5 year lease.
This map shows the new leases around Chief Mountain. The area to the west is Glacier National Park.
This oil drilling map will show you the entire reservation area. Chief Mountain is in the upper left of the Blackfeet reservation area. This is a short video I made a few years ago, of the Chief Mountain area now leased for oil drilling.