The Boseto concentrator will be upgraded from its current 3.0 million tonnes per annum nameplate capacity to 3.6 million tonnes per annum to treat the Zone 5 ores. The ores respond well to conventional sulphide flotation, producing approximately 165,000 tonnes of high-grade copper concentrate at 40% Cu and 375g/t Ag. The concentrate will be road hauled to port for shipping and sale on the international market.
process plant design criteria summary|
The project requires this plant to be upgraded to process 3.65Mtpa of sulphide copper ore, mined from the Zone 5 mining operation. The upgrades are predominantly required to cater for the Zone 5 ore characteristics and higher throughput, however, the replacement of the scalping and product screens and provision of a Larox filter is included to achieve tonnage and/or quality respectively.
This upgrade will be achieved through the following:
- Modification to the ROM hopper to allow for direct unloading of 100 to 150t net payload road haul trucks.
- Refurbishment and repairs to the existing primary crusher.
- Replacement and/or upgrade of the scalping and product screens.
- Reconfiguring the rougher and scavenger circuits to utilise overall capacity on sulphide only.
- Existing regrind mills replaced with ultrafine regrind unit.
- Cleaner 1 and 2 tanks cells replaced with new pneumatic cells.
- Existing plate and frame filter replaced with a Larox vertical pressure filter.
- Reconfigure and upgrade one of the existing concentrate thickeners.
- Installing additional manual bagging plant to facilitate concentrate loadout.
- Upgrading services where appropriate to support the previous upgrades.
- Provision of a 20Ml raw water dam to feed the processing plant.
General upgrade to improve the condition and operability of the plant.
|Process flow diagram for the proposed plant
|Typical standard of upgrade design,
modifications to the flotation circuit, addition of a new ultrafine regrind
mill and two (2) new pneumatic cleaner cells.|