- Project Overview: Perseus Mining’s Nyanzaga Gold Project in Tanzania (Feasibility Study completed June 2025) features a 5Mtpa gold processing plant designed by Lycopodium Minerals.
- Key Circuit Components:
– Crushing: Metso Superior MKIII gyratory crusher (375 kW)
– Grinding: SAB circuit (9.75m SAG mill + 7.32m ball mill, 10.5MW each)
– Gravity Recovery: Centrifugal concentrators + intensive cyanidation
– Leaching: 24-hour CIL circuit (6×3,250m³ tanks) with pre-oxidation
– Gold Recovery: Split AARL elution + electrowinning - Design Parameters:
– Target grind size: P₈₀ 75µm
– Gold recovery: 86% (design)
– Gravity recovery: 30% of total gold
– Throughput flexibility: 4.76-6.0Mtpa depending on ore characteristics - Mercury Handling: Dedicated abatement system for 1.1g/t Hg feed, including retort oven and carbon filtration.
- Water Management: 90%+ water recycling via thickeners and TSF decant system, with Lake Victoria as primary raw water source.
- Power Demand: 28.6MW average draw (250.8GWh/year), primarily for grinding (158.6GWh/year).
- Ore Blend: 11.7% oxide + 88.3% fresh ore (mudstone/sandstone dominant) over LOM.
Further Reading
- Nyanzaga Gold Project
- Perseus commits $523m to develop Nyanzaga Gold
- Nyanzaga Gold Project Technical Report
- Nyanzaga Gold Project, Tanzania
- For personal use only
Technical report and processing history
The following archived source profiles have been consolidated here to preserve the project’s processing history and study context.
Nyanzaga Gold Project — 2025 Technical Report
Nyanzaga Gold Project — 2025 Technical Report
| Company | Perseus Minerals |
| Date | 2025 |
| Region | Tanzania |
| Commodities | Gold, Silver, Mercury |
| Mine Type | Open Pit |
| Throughput | 5,000,000 t/a |
| Mine Life | LOM |
| Status | Development |
Executive Summary
This section of the NI 43-101 Technical Report details the recovery methods designed for the Nyanzaga Gold Project. The processing plant was designed by Lycopodium Minerals Pty Ltd with a nameplate ore treatment rate of 5.0 Mt/a. The design incorporates a Feasibility Study level of engineering, utilizing industry-standard equipment and Australian standards. The plant layout is optimized for the restrictive topography and includes a single center of operations for mining, administration, and processing.
The metallurgical design focuses on processing a blend of ore types, predominantly fresh ore (88.3%) with a smaller portion of oxide ore (11.7%). The comminution circuit utilizes an SAB configuration (SAG milling with pebble recycle and ball milling in closed circuit with hydrocyclones) to achieve a target grind size of P80 75 μm. A gravity circuit is included to recover coarse gold and mitigate high-grade spikes in the CIL circuit. The gold recovery process involves a pre-oxidation stage followed by a six-stage Carbon-in-Leach (CIL) circuit with a 24-hour residence time.
The flowsheet also addresses specific challenges such as mercury presence, arsenic, and antimony. Mercury abatement technologies are integrated throughout the gold room and carbon regeneration areas. Cyanide detoxification using SO2/Air is included to ensure tailings meet environmental standards. The process concludes with electrowinning and smelting to produce doré bars. Power and water requirements are designed to support these operations, with water sourced from Lake Victoria and recycled from the TSF.
Processing Profile
- Crushing: Primary Gyratory Crusher (Metso Superior MKIII 42-65)
- Milling: SAG Mill (9.75m) + Ball Mill (7.32m) in SAB Circuit
- Gravity: Centrifugal Gravity Concentrators
- Leaching: Carbon-in-Leach (CIL) with Pre-oxidation
- Elution: Split AARL
- Recovery: Electrowinning & Smelting
- Tailings: Thickening & Cyanide Detoxification
Reports
Website: https://perseusmining.com/nyanzaga/
Report Date: 2025
Region: Tanzania
Project Status: Development
Commodity: Gold, Silver, Mercury
Throughput: 5,000,000 t/a
Mine Life: LOM
Mine Type: Open Pit
Ore type:
