There is a zonation of alteration types within the deposit area with distal propylitic
alteration grading into proximal silicification, argillic alteration and potassic alteration.
At the upper levels of the deposit, and in particular in the north above the vein zone,
the alteration is predominantly argillic.
Weak to moderate propylitic alteration (chlorite–calcite + sericite + pyrite + epidote)
occurs within 400 m of the Kupol structure, particularly in the hanging wall to the vein.