Monto, Queensland, Australia
Engineering | Procurement | Construction | Management
Robbins completed a feasibility study for Monto Minerals which split into two separate operations, situated in two different locations: Goondicum Wet Separation Plant (WSP) and Dakiel Feldspar Upgrading Plant.
The Goondicum WSP was undertaken by Robbins at a cost of AUD$23 million. Robbins performed and managed the design, procurement, fabrication, site co-ordination & construction of the feed preparation areas, processing plants & materials handling/storage associated with the project as follows:
• Area 11 – Feed preparation
• Area 12 – Concentrate Upgrading Plant
• Area 13 – Feldspar Separation Plant
• Area 14 – Apatite Separation Plant
• Water Balance
• Mobile and tailing disposal areas;
• Mobile mining and ore transfer equipment;
• Infrastructure (inc earthworks, dams, roads, site services, site buildings etc);
• Power supply (site based);
• Water supply;
• Ore/Feed Preparation Area;
• Wet Separation Plant; and
• Concentrate & Product storage areas.
The Dakiel project works consisted of a Feldspar Upgrading Plant, Rail Loading Facility and Feldspar Plant Feed System.
The Feldspar Upgrading plant comprised the following.
Feed Preparation Plant, where magnetic materials are separated from non-magnetic material and rejected.
Leaching, where the overall objective is to reduce Iron content of Feldspar from nominally 0.5% to less than 0.3% Iron. This is performed using hot sulphuric acid.
Leached Solids Washing, where residual acid is removed from the solids.
Leached Solids Drying, where solids are dewatered and dried in a fluid-bed dryer.
Product upgrading, storage and outloading, where feldspar is screened at 425 micron to improve magnetic separation. Magnetic material is rejected and Feldspar is sent by train to the existing Graincorp silos and ship loading conveyor belt at Auckland point.
Lime processing and neutralisation, where unreacted sulphuric acid is neutralised with hydrated lime slurry. Gypsum is precipitated from this process and the slurry is discharged into a thickener and settling sumps to allow the gypsum to settle out and clear overflow water is discharged to a storage dam.
Reagent Storage, where sulphuric acid and caustic are stored in dedicated tanks within their own storage bunds. Each tank is nominally 40m3.
This project formed part of a development program by Monto Minerals Limited with the objective to process nominally 200 TPH of Run of Mine head feed and extract valuable Ilmenite, Feldspar and Apatite minerals.
The Feldspar concentrate is stockpiled before processing through further re-treatment in the Feldspar Upgrading plant. Initial production per annum from the Mineral Separation Plant to the Feldspar Upgrading plant is comprised of 100,000 to 165,000 tonnes of Feldspar.