This paper discusses a long range mine plan development at the Santa Fe
Pacific Gold Twin Creeks Mine based on the reserves of Mega pit. The
key constraints of the schedule development included two types of mill
ore targets (sulphide and oxide mill ore), consideration of blending of six
chemical constituents (sulphide sulphur, carbonate, organic carbon, the
ratio of iron/[arsenic, antimony]), and mining of acid generating and acid
neutralizing waste at pre-defined proportions. Solution approaches,
selected results, and project experiences are discussed.