The Goliath Gold Complex NI 43-101 Technical Report and Prefeasibility Study, effective February 22, 2023, describes a proposed processing plant designed to treat material from the Goliath, Goldlund, and Miller deposits in the Kenora District of Ontario.
Report context
This technical report and prefeasibility study, with an effective date of February 22, 2023, was prepared for Treasury Metals Inc. The report covers the Goliath Gold Complex located in the Kenora District, Ontario, Canada, and includes mineral processing and metallurgical testing, recovery methods, and process design for the proposed operation.
Processing route
Overall Process Design
The proposed processing plant is designed to treat ore from three deposits: Goliath, Goldlund, and Miller. The overall process design incorporates a conventional gold recovery flowsheet consisting of crushing, grinding, gravity recovery, intensive cyanidation, leach and adsorption, cyanide destruction, and tailings thickening.
Crushing and Ore Stockpiling
The proposed crushing circuit includes primary crushing followed by ore stockpiling ahead of the grinding circuit. The design provides for surge capacity between the crushing and grinding stages.
Grinding Circuit
The grinding circuit is designed to reduce the ore to a target grind size for gold liberation. The report indicates that recovery models were developed based on the grind size, with specific recovery models for Goliath and Miller, and separate models for Goldlund.
Gravity Recovery Circuit
The proposed gravity recovery circuit includes centrifugal concentrators designed to recover coarse gold prior to leaching. This circuit is integrated with an intensive cyanidation reactor for processing gravity concentrate.
Intensive Cyanidation Reactor
Gravity concentrate is directed to an intensive cyanidation reactor for high-concentration leaching of the gravity gold concentrate.
Leach and Adsorption Circuit
Following gravity recovery, the ore slurry is directed to a leach and adsorption circuit. This circuit employs cyanidation leaching with carbon-in-pulp or carbon-in-leach adsorption for gold recovery from solution.
Cyanide Destruction
The proposed flowsheet includes a cyanide destruction circuit using sodium metabisulphite (SMBS) and copper sulphate to treat the leach tailings prior to thickening and deposition.
Tailings Thickening
Tailings from the cyanide destruction circuit are thickened in a tailings thickener to recover process water and produce a thickened tailings stream for disposal.
Carbon Acid Wash, Elution and Regeneration Circuit
Loaded carbon from the adsorption circuit is processed through an acid wash, elution, and regeneration circuit. Gold is stripped from the carbon in the elution circuit, and the regenerated carbon is returned to the adsorption circuit. Gold-bearing solution from elution is directed to the gold room for recovery.
Gold Room
The gold room receives gold-bearing solution from the elution circuit. Gold is recovered through electrowinning or precipitation, and the resulting gold sludge is smelted into doré bars using fluxes.
Reagent Handling and Storage
The proposed plant includes reagent handling and storage facilities for hydrated lime, sodium cyanide (NaCN), copper sulphate, sodium metabisulphite (SMBS), sodium hydroxide (NaOH), hydrochloric acid (HCl), flocculant, activated carbon, oxygen, and gold room smelting fluxes.
Services and Utilities
Plant and instrument air systems are included in the design. Electrical power supply is specified for the process plant and associated infrastructure.
Water Supply
The design includes fresh water and process water supply systems, as well as gland water supply for pump seals.
Key reported parameters
| Parameter | Units | Basis |
|---|---|---|
| Plant throughput | Not specified | Proposed design |
| Grind size | Not specified | Testwork basis |
| Gold recovery – Goliath and Miller | % | Recovery model from testwork |
| Gold recovery – Goldlund | % | Recovery model from testwork |
| Gravity recovery | Not specified | Proposed design |
| Leach residence time | Not specified | Proposed design |
| Cyanide detoxification | mg/L | Testwork basis |
| Tailings thickener underflow density | % solids | Proposed design |
| Reagent consumptions | kg/t | Proposed design |
Technical qualifications
The report contains specific limitations identified by the qualified persons. Metallurgical testwork was conducted on samples from the Goliath, Goldlund, and Miller deposits, and the results were used to develop recovery models. The report notes that the testwork included comminution testing, extended gravity recovery gold (E-GRG) testing, leaching testing, oxygen uptake testing, and cyanide detoxification testing. Thickening tests including flocculant scoping, static settling tests, dynamic thickening, and rheology testing were performed. Deleterious elements were evaluated as part of the testwork program. The recovery models are differentiated for Goliath and Miller versus Goldlund, and for Goldlund Zone 1 versus other Goldlund zones. The report indicates that historical testwork was conducted prior to the prefeasibility study testwork program.
Source: Goliath Gold Complex NI 43-101 Technical Report and Prefeasibility Study, effective February 22, 2023, Sections 13 and 17.
Consolidated report summaries
The following former standalone pages about this operation were consolidated here on October 25, 2026. They are retained for source traceability; dates and figures reflect each report’s own effective date and may be superseded by the current information above.
NI 43-101 Technical Report & Preliminary Economic Assessment of the Goliath Gold Complex
A March 2021 preliminary economic assessment for the Goliath Gold Complex in Ontario, Canada, describes proposed processing facilities and presents historical and testwork data for three deposits.
Report context
This NI 43-101 technical report and preliminary economic assessment for the Goliath Gold Complex was prepared for Treasury Metals Inc. with a report date of March 10, 2021, and an effective date of January 28, 2021. The report was refiled on May 31, 2021, because tables on pages 463-465 were cut off in the original filing on SEDAR on March 11, 2021. The complex encompasses three properties: Goliath, Goldlund, and Miller, all located in Ontario, Canada.
Processing route
Crushing Circuit
The proposed processing route begins with a crushing circuit. Run-of-mine material is fed to the crushing circuit, which reduces particle size prior to the mill feed stockpile.
Mill Feed Stockpile
Crushed material is directed to a mill feed stockpile. This intermediate storage provides surge capacity between the crushing and grinding circuits.
Grinding and Gravity Circuits
From the mill feed stockpile, material enters the grinding and gravity circuits. These circuits reduce particle size further and recover free gold using gravity separation methods.
Leaching and CIL
Following grinding and gravity recovery, the material proceeds to leaching and carbon-in-leach (CIL) circuits. Gold is dissolved in cyanide solution and adsorbed onto activated carbon.
Elution and Carbon Regeneration
Loaded carbon from the CIL circuit is processed through elution to strip gold from the carbon. The stripped carbon is then regenerated for reuse in the CIL circuit.
Intensive Leaching
An intensive leaching circuit is included to treat gravity concentrate, providing additional gold recovery from the high-grade concentrate stream.
Electrowinning and Gold Room
Gold-bearing solution from elution and intensive leaching reports to electrowinning cells, where gold is deposited onto cathodes. The gold room provides facilities for refining and producing doré bars.
Cyanide Detoxification and Tailings Management
Tailings from the CIL circuit undergo cyanide detoxification to destroy residual cyanide before deposition in the tailings storage facility.
Consumables and Reagents
The processing plant includes facilities for storing and handling consumables and reagents required for the process, including cyanide, lime, and other processing chemicals.
Key reported parameters
| Parameter | Value | Basis |
|---|---|---|
| Processing rate (proposed) | Not specified in processing sections | Proposed design |
| Goliath metallurgical testwork (2011) | KM2906 | Testwork |
| Goliath metallurgical testwork (2012) | KM3406 | Testwork |
| Goliath metallurgical testwork (ALS) | KM5262 | Testwork |
| Goliath metallurgical testwork (Base Metallurgical Laboratories) | BL0172 | Testwork |
| Goldlund metallurgical testing | Referenced, details in Section 13.4 | Testwork |
| Goliath and Goldlund combined testing | Referenced, details in Section 13.5 | Testwork |
| Historical production (Goldlund-Miller property) | Referenced, details in Section 6.2.3 | Historical operating data |
Project website: https://nexgold.com/goliath-gold-complex/
Technical qualifications
The report is a preliminary economic assessment and therefore does not represent a feasibility study. The mineral resources presented are not mineral reserves and do not have demonstrated economic viability. The processing design and flowsheet are based on proposed design parameters and metallurgical testwork; no actual plant operating data from the Goliath Gold Complex is available as the project has not been constructed. All metallurgical testing referenced is from laboratory-scale test programs, not from production-scale operations. The report notes that tables on pages 463-465 were cut off in the original filing, requiring refiling for completeness.
Source: N.I. 43-101 Technical Report & Preliminary Economic Assessment of the Goliath Gold Complex, report date March 10, 2021, effective date January 28, 2021. Sections 1.11, 13, 17.
