It never ceases to amaze me how people fail to see the difference between construction (of minesites) and actual mining. It all just gets lumped into one big bucket. You can't keep building new stuff forever, but, when the mines are all operational, guess what? They still employ a lot of people. Not as many as that short construction phase, but that's the nature of construction. Even down to the social implications-- a lot of the criticism thrown at "miners" re behaviour on flights, in camps, etc, is down to construction workers, building minesites. There is a world of difference between construction camps and established mine camps, believe me.
Anyway, back on topic. When the building is done, the mines operate. They still put a lot of bums on aircraft seats. And will continue to do so. A more accurate description would be "THE CURRENT CONSTRUCTION BOOM IS NEARING ITS END"