Back at where he started 44 years ago,63-year-old Lobsang Dorje was a bit emotional.In front of the huge grey buildings,he stopped for a long time.He pointed at the towering grey cylindrical building, "Built in 1986,the wet-process kiln production line could produce 100,000 tons annually.It had been in operation until 201 1.Before my retirement,I was the assistant plant manager here."