I have read that the accident happened not in 4-th orbit but in final turn (Russian tells the 4-th turn) to extended axis of RWY28. RWY28 is equipped with ILS, DME/VOR, 2xNDB. Witness told a fall from the hight of 800m to a quarry near Tassay village.
Maybe here:
тассай - Mapy Google
After impact they saw big explosion and fire. Only fragments of the plane remains, except for tail part. Nobody survive. It is darkness and dense snowing there in this time.
Frontier guard of Kazakhstan had two An-72, both made 1991, UN-72850 in service from 2005 and UP-72859 from October 2012