RE: Feasibility Study Update4 Jan 2023 14:11
This extract from an 'older news 'publication with its desc of mining methodology is out of date but still interesting detail for me on what SLOS involves. They only predict a current 9 year mine life but clearly only based on current official resource estimate.
'Following positive drilling results, Greatland updated the property’s total mineral resource estimate in March 2022 to 5.5 million oz of gold (Au) and 218,000 tonnes of copper (Cu), at 1.9 g/t of gold and 0.24% copper.
The updated ore reserve is 25 million tonnes (Mt) at 3.0 g/t Au and 0.44% Cu for 2.4 million oz of gold and 109,000 tonnes of copper.
Mining Method
The Stage 1 PFS assessed mining methods at the property including the underground Sub-Level Open Stoping (SLOS) method with mining rate ranging between 2-3 million tonnes per annum (Mtpa).
SLOS is a large-scale open stoping method that is conducted over multiple levels simultaneously. Under this method, a stope is backfilled with paste after mining to maintain the stability of the opening and enable mining of adjacent stopes.
The stopes are expected to be mined in a checkerboard fashion starting with primary stopes and then advancing towards intermediate secondary stopes.
The ore produced from the Havieron mine is planned to be transported to Telfer mine via road trains on an all-weather unsealed road. The road has been designed to withstand major floods and maintain access to the mine.
The Havieron mine will be powered by Telfer’s existing gas power station via a 66-kilovolt (kV) overhead line that will run parallelly to the nominated haul road corridor.
The project is expected to have a mine life of nine years.
Ore Processing
The Havieron ore is planned to be processed through a modified Telfer Processing Plant with a single train at 6Mtpa rate on a campaign basis.
The modifications that will be made at the plant will include magnetic separation within the flotation circuit to reduce the amount of pyrrhotite in the final Cu Concentrate. A Carbon in Pulp (CIP) circuit will be installed on the flotation tail and cyanide detoxification circuit.
The tailings from the ore processed will be deposited at the existing Telfer TSF.
Currently, the facility operates two processing trains with a total capacity of around 22 Mtpa.
Contractors involved
Australia-based Derisk Geomining Consultants conducted an independent review of the Havieron mineral resource estimate that was published in November 2020.
Byrnecut, an underground mining contractor, was selected for works such as site establishment, box-cut support, decline development, shotcrete and raise boring services.
Local firm Rockwater was engaged to provide hydrogeological consulting services for the Havieron Project. The scope of work includes the characterisation of poorly-known aquifers within the thick Permian overburden using packer tests, pumping tests, nuclear magnetic resonance surveys, core logging, and correlation with geot
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