What happened when the Qing Dynasty sent Xinjiang?

Since the Shang and Zhou Dynasties, being sent is one of the five punishments, called mobility or migration, that is, exile. If you are in this punishment file, the more serious the crime, the farther you will be sent, just like the imprisonment of 3-7 years in our current criminal law, and there is the possibility of being sent to 3000 exceptions in 3 years, then the 7-year-old child will be sent thousands of miles away. Of course, the place where you were sent was considered to be the hardest place at that time.