Lodi Gyari helped bring Tibet's cause to world attention, and led talks with China on Tibet's status from 2002 to 2010.
Visitors barred from entering Buddhist institute during during annual Dechen Shingdrup festival.
Many had sold all the animals they had under government orders to reduce their herds.
Chinese workers assault them when they try to block work on a project causing damage to local grassland.
They must move to make way for an electric power plant and Chinese mining projects.