At Stratmat, RoM material will be mined by underground mining, too, similar to Halfmile underground mining except there is no PPCF/MCF mining method employed. RoM materials will be directly hauled by 45-tonne capacity underground trucks to Stratmat DMS plant for waste separation.
There will be two independent ramp systems to access Stratmat underground mineralization. The Main ramp system will be used to access the S1 (Shallow and Deep), S0, and S5 zones (main production system); and the Main zone ramp will be used to access the Main zone underground mineralization (supplement production system).
Backfill will be first sourced from development waste rock, supplemented by back trucked Stratmat DMS plant separated waste.
Ventilation is designed at 189 cms (400,000 cfm) for a production rate of 1,400 t/d for the main production system, providing an estimated 14% contingency. Intake will be through the Main ramp and a 3.6 m diameter of raisebored FAR, exhaust will be through a 4.5 m diameter of raisebored RAR.
Ventilation is designed at 42 cms (90,000 cfm) for the supplement production system. Intake will be through the Main zone ramp, exhaust will be through a 2.4 m diameter of raisebored RAR.
Underground dewatering strategy is similar to the Halfmile underground dewatering system.
Due to the complex geometry and variability in strike and dip, the development of a tool box of mining methods is recommended in o ........
