Mirza Abu Bakr ruled Yarkand for 48 years and his ruling was featured by creation of unique and highly effective penitentiary system, that had no analog in other countries. After discovering, by occasion, 29 large bowls, filled with gold sand and silver coins ("Balysh"), during excavation in the old city of Yarkand, Mirza Abu Bakr ordered to start excavations throughout the whole country in all old cities of towns and in abounded cities of Taklamakan Desert as well. To get workforce for performing of mass excavations he used convicts, both males and females of any age. The place of site of excavation was named "Kazyk " and numerous barracks for convicts and the guards were erected, convicts were sent to "Kazyks" by stages from all over the country and excavation works were continuing the whole year without interruptions. Using this forced labour system he collected during his reign very large amount of treasuries and became the owner of very rare and valuable things, some of them hundreds and thousands years old.