Sub-level open stoping (SLOS) with paste fill, and LHOS have been selected as the preferred mining methods.
The TBO UG Ore Reserve is based on sub-level open stoping (SLOS) with paste fill, and long hole open stoping (LHOS) mining methods. SLOS is the dominant mining method, and accounts for 87% of the Ore Reserve estimate by tonnes. The SLOS zone, ranges in width from 3m to 50m, and dips at 70-80 degrees.
Average mining dilution is 11%. 15% dilution has been applied to up hole stopes to account for paste dilution, and 6% dilution assumed for the down hole stopes. All dilution was assumed to be at zero grade.
The average mining recovery is 94%.
Minimum mining widths of 3m, this is based on the current stope performance to date, and mining method considerations.
Inferred material is excluded from the ore reserves. The Life of Mine Plan (LOMP) design includes Inferred Resources representing 6% of the mining inventory, contained within the stopes and development in the periphery of the indicated resource. This amount contributes to a minor amount of metal (<6% of ounces). Ongoing grade control drilling is also part of the LOMP.
The selected mining method requires the development of an access decline, ventilation raises, and associated electrical, paste fill plant and dewatering infrastructure. Paste fill plant is currently operational.
Underground mechanised mining for development, ground support, and ........
