Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Processing |
- Agitated tank (VAT) leaching
- Carbon in pulp (CIP)
- Cyanide (reagent)
|
Mine Life | 1.8 years (as of Jan 1, 2018) |
The Geko gold project is in the shire of Coolgardie, Western Australia, approximately 25 kilometres west-north-west of the township of Coolgardie, or about 15 kilometres north of the Bullabulling Gold Mine. It is situated within the Bullabulling Station pastoral lease, in the Jaurdi Land Division of the Coolgardie Mineral Field. It consists of two tenements being M15/621 and L15/229.
On February 2020, Coolgardie Minerals Limited’s (CM1) interest in the Geko gold project has been sold to Habrok is a private company Habrok (Geko Pit) Pty Ltd.
Habrok recommenced mining at Geko in 21 March 2020. |
Latest News | Coolgardie Minerals enters voluntary administration March 4, 2019 |
Source:
p. 12,45
26 July 2017, Bulletin Resources (ASX: BNR, Bulletin) acquired all of the issued capital of Gekogold Pty Ltd (“Geko”).
In addition to the royalty, Bulletin owns a 30 % profit share and joint venture interest in the Geko gold mine.
Bulletin’s profit share commences after the mine has achieved a profit of $9 million.
In February 2018, Gekogold and Coolgardie Minerals Limited (CML) have formed a joint venture on a 30:70 basis on the tenement area outside the Project. CML will operate the joint venture.
On 13 February 2020, Habrok (Geko Pit) Pty Ltd (“Habrok”) acquired the Geko gold mine and project area from Coolgardie Minerals Limited (Receivers and Managers Appointed) (Administrators Appointed). Habrok is a private company incorporated for the acquisition and is backed by the Remagen Capital Group which is a Sydney based privately owned investment company that has recently taken investments in mining projects and mining services related entities.
Summary:
The deposit occurs within mafic lithologies which have been altered and deformed to a sericite-quartzbiote-hornblende schist. This schistose unit directly overlies an ultramafic sequence and gold mineralisaon is hosted within a shear zone formed at or near the contact which is dipping 60° to the south. The mineralisaon orientaon within this package dips approximately 45°south. Deep weathering has produced a laterite profile to approximately 80m depth and includes supergene enriched mineralised zones. Overlying the weathered basement rocks is a 10 20m thick transported alluvium horizon which underlies a layer of un-mineralised Cainozoic sediments. Re-interpretaon of the Geko gold deposit by Mining Plus resulted in the idenficaon of two discrete zones in the main area of mineralisaon called the Main Zone and Hangingwall Zone which are host to the majority of the mineralisaon. The Main Zone extends from the underlying fresh material into the weathered zone above and has a small supergene enriched gold zone at the top. The Hangingwall Zone isolates a local high-grade zone on the hangingwall contact. There are also mulple small mineralised zones of varying size located within the weathering profile. In addion, there is a zone of high-grade mineralisaon that either abuts the base of an alluvium horizon or detaches and runs through the moled clay material beneath the alluvial zone.
The Geko deposit occurs within mafic lithologies which have been altered and deformed to a sericitequartz-biote-hornblende schist. This schistose unit directly overlies an ultramafic sequence and gold mineralisaon is hosted within a shear zone formed at or near the contact which is dipping 6 0° to the south. The mineralisaon orientaon within this package dips approximately 45°south. Deep weathering has produced a laterite profile to approximately 80m depth and includes supergene enriched mineralised zones. Overlying the weathered basement rocks is a 10 20m thick transported alluvium horizon which underlies a layer of un-mineralised Cainozoic sediments. A total 744 holes comprised the Geko drillhole database and, of these, 566 holesfor 38,194m were used to create a stragraphic model, with of 211 holes used for the Mineral Resource esmate, including 35 air-core holes, 20 diamond holes and 156 RC holes. Geological interpretaon
of 12 mineralisaon wireframes using a 0.5 g/t Au cut-off grade was used to constrain interpolaon of composited drillhole assay grades into a block model.
Summary:
Open pit mining by a mining contractor utilising a conventional drill and blast, load and haul operation.
In the FS, the Geko open pit is planned to be mined as a convenonal drill and blast, load and haul operation. The pit walls are assumed to apply convenonal baer and bench (catch berm) to a depth of ~140m to ~150m. Mining is to reflect a mining bench which is made up of two 2.5m flitches.
Total open pit mine life is 22 months.
October 31 2018, gold ore production has commenced at the Geko Project.
As announced on 17 December 2018, a revised three-stage mine plan for Geko was developed and executed to optimise future mining.
Stage One: Mining of high-grade supergene zone, completed 31 December 2018. The final physical results from Stage 1 were 7,980 tonnes at 5.94g/t Au containing gold of 1,524oz. In addition, 50,200 tonnes at 1.09g/t Au were stockpiled for future toll milling.
Stage two mining of the Geko project commenced in March quarter 2019. This Stage planned to mine 260,000 tonnes of ore at 2.23 g/t Au for total contained ounces 18,640 oz. The Stage envisaged completion of the internal West pit first and subject to its success, followed by the mining of the internal East pit. The West pit did not produce the tonnage and grade as predicted by the model due to mine dilution and underperformance of the oxide zone to enable sales to Northern Star Resources which required a minimum head grade of 2.75 g/t. Total production for the quarter was approx. 64,000 tonnes at 1.00g/t Au.
Stage Three, which will mine the remainder of the orebody (circa 1.3m tonnes at 1.7 g/t Au containing 71,000 ozs) is subject to the successful completion of Stage Two and securing a Toll Milling Agreement acceptable to the company.
Coolgardie Minerals Limited (owner-operator) found itself in an extremely dire position in early 2019 and was forced to appoint Administrators to the company, with the substantial creditor subsequently appointing Receivers and Managers.
On February 2020, Coolgardie Minerals Limited’s (CM1) interest in the Geko gold project has been sold to Habrok is a private company Habrok (Geko Pit) Pty Ltd.
Habrok recommenced mining at Geko on 21 March 2020.
Geko has advised that during March 2021 quarter, ore processing was delayed as they moved to a toll treating arrangement at a new ore processing facility. Geko have further advised that late in the quarter, approximately 3,150 ounces of gold were produced with final figures currently being reconciled.
Processing
- Agitated tank (VAT) leaching
- Carbon in pulp (CIP)
- Cyanide (reagent)
Source:
Summary:
Ore processing costs and recoveries have been determined based on Geko ore being toll milled, using a contracted ore treatment facility to recover gold for an agreed cost. The existing currently operating Lakewood gold processing facility (Lakewood), owned and operated by GMM is anticipated under the FS to be used to process the Geko ore. This mill has a capacity of approximately 0.75 Mt/a or 95–100 tonnes per hour (t/hr) and is located approximately 5 km southeast of the township of Kalgoorlie.
Lakewood uses subcontracted crushing services to crush run of mine ore down to less than 20 mm in size. The grinding circuit is comprised of a single grate discharge ball mill in closed circuit with a set of hydrocyclones. All of the mill discharge is screened at approximately 2 mm, with the +2 mm fraction reporting back to the mill feed while the -2 mm is fed to two 30” Knelson centrifugal concentrators. The cyclone overflow from the grinding circuit is screened to remove trash and ........

Recoveries & Grades:
Commodity | Parameter | 2018 |
Gold
|
Head Grade, g/t
| 5.94 |
Production:
First gold ore production from the Geko open pit operations commenced in late October 2018.
Commodity | Units | 2018 |
Gold
|
oz
| 1,524 |
All production numbers are expressed as metal in ore.
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Operational Metrics:
Metrics | 2018 |
Ore tonnes mined
| 58,180 t |
Tonnes processed
| 7,980 t |
Reserves at December 1, 2018:
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
1,238 kt
|
Gold
|
1.69 g/t
|
67.3 koz
|
Probable
|
340 kt
|
Gold
|
2.25 g/t
|
24.6 koz
|
Proven & Probable
|
1,578 kt
|
Gold
|
1.81 g/t
|
91.9 koz
|
Measured
|
1,745 kt
|
Gold
|
1.6 g/t
|
89 koz
|
Indicated
|
690 kt
|
Gold
|
1.7 g/t
|
37 koz
|
Inferred
|
120 kt
|
Gold
|
2.6 g/t
|
10 koz
|
Financials:
| Units | 2018 |
Revenue
|
M AUD
| 1.7 |
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