The Leonora Project is located in the Shire of Leonora, approximately 55km northwest of Leonora town in Western Australia. Access to tenements is from the Goldfields Highway or from the Leonora – Agnew Rd at the Bannockburn Mine site. Being close to existing infrastructure and well serviced towns ensures support for field activities. The Jungle Well and Minotaur Projects are contiguous along the Mt Clifford Shear Zone. Brilliant Well is east of the Goldfields Highway and covers a complicated greenstone / granite gneiss contact.
Numerous operating gold mines in the region include Thunderbox, and Darlot, with King of the Hills (Red 5) advancing towards development.
Gold has been mined at Jungle Well, with mining of a shallow oxide pit in 1996. Explorers have targeted Nickel within the Jungle Well and Minotaur tenements and base metals at Brilliant Well. Limited gold exploration has been completed and PVW believe there is significant potential within all the projects.
Nickel and base metal exploration efforts have resulted in quality geophysical datasets that will be reprocessed and interpreted with a view to identify and target gold hosting stratigraphy and structure.
Leonora Project and tenement location
The Brilliant Well Project is geologically located at the western margin of the Kurnalpi Terrane, a major component of the Eastern Goldfields Superterrane. Jungle Well and Minotaur Project are located west of the terrane boundary within the Kalgoorlie Terrane. Terranes contain several Domains bounded by interconnecting major fault systems. These fault systems are the target of exploration activities.
Geological location of the Leonora Project
The Kurnalpi Terrane comprises a sequence of mafic volcanic rocks, calc-alkaline complexes, sedimentary rocks and mafic intrusives overlain by bimodal rhyolite-basalt and felsic calc-alkaline complexes extending along the western edge of the terrane. The Teutonic Bore Complex, host to significant base metal mineralisation, is one of three significant bimodal calc – alkaline complexes. To the east (Brilliant Well) the stratigraphic succession is dominated by mafic granitoids which host numerous partially assimilated Archaean greenstone rafts.
The preferred host at the nearby Celtic Pits (Saracen – Bundarra Project) is a highly oxidised, coarse-grained granitoid. It varies in composition from a granodiorite, through tonalite to quartz diorite. Gold mineralisation occurs within the mafic granitoids close to their contacts with greenstones. Regionally gold mineralisation occurred late in the tectonic history and is strongly associated with the late shears and mafic granitoids.
At Jungle Well and Minotaur Project the Clifford, Minnieritchie and Perseverance Faults are the largest of a series of predominantly north-northwest trending structures. The Clifford Fault tracks along the Jungle Well and Minotaur Project areas and bounds the east of the Mt Fouracre Complex. Ultramafic rocks of the Marshall Pool Syncline are relatively undisturbed to the east of the Minnieritchie Fault.
Throughout the goldfields, thrust zones are an important control on mineralisation. There is an association between strike change and/or flattening of steep shears and gold mineralisation. Thrust repetitions of mineralised structures are also key to formation of large deposits.
With this in mind, Jungle Well and Minotaur Projects are located at the regional junction between major northwest to north-northwest trending shears and the north-south tectonic zone. Thrusts zones are visible in regional magnetics and locally within the Jungle Well open pit.
Regional magnetics and recent results
Jungle Well / Minotaur Project
Jungle Well has had a gold focused exploration history following the pegging of original mineral claims in 1980. Shallow workings were the target of various drilling campaigns culminating in mining of the shallow Jungle Well oxide open pit in 1996–97. Exploration since mining in 1997 has been limited. Jubilee Mines NL are the most recent explore. In 2003 during Nickel exploration diamond drilling, they intersected significant results in NJWD002 with 13.33m @ 1.74g/t Au from 276m downhole.
Within the bounds of the Minotaur Project, extensive nickel exploration was undertaken in the region during the 1960’s and 1970’s, most notably by WMC, Seltrust, Amax and BP Minerals. Some grassroots gold, nickel and PGE exploration was undertaken during and since the 1980’s, primarily by Outokumpu, Dominion, Forrestainia Resources, Dalrymple Resources, Miralga Mining, Lionore, Breakaway Resources and Minotaur Project.
Previous explorers for gold and base metals include Delta Gold, Sons of Gwalia Ltd, Pilbara Mines Ltd, and Brumby Resources Ltd. Explorers prior to Brumby focused on the Teutonic Bore Complex in the southwest of the tenement. Brumby explorers were more successful testing the granite/greenstone contact and major structural corridors, with anomalous and significant gold, copper and zinc results from drilling. Some of the Brumby gold results have been followed up by PVW Resources, with continued positive outcomes.
Exploration Gaps – Discovery Potential
The Leonora Project, incorporating Jungle Well, Minotaur Project and Brilliant Well, has received sporadic exploration for Nickel, base metals, and gold. Key points to consider:
- Exploration success has been limited to areas of outcropping or sub-cropping mineralisation. Large deposits such as Thunderbox are concealed under significant cover.
- There is no outcrop at Brilliant Well. The transported cover, north of Jungle Well is overall not a consistent material and is not suitable for systematic surface exploration.
- A significant percentage of the drilling has targeted Nickel or base metals without assaying for gold.
Exploration success has been hampered by some geological obstacles. These are technical challenges that can be overcome and include:
- A regional lack of outcrop or consistent surface sample medium, highlighting the need for detailed geophysics, and drilling to bedrock.
- Downhole geochemistry is lacking in the region. While geophysics will be essential to targeting, geochemistry will be essential to evolution of the targets, hence the need for routine downhole geochemistry to distinguish preferred host lithologies.
- Exploration has focused on major geophysical feature orientations, without enough consideration of local controls on mineralisation. Detailed interpretation of geophysics and drilling data is required to target mineralised structures and local controls.
Planned Exploration Activities
Exploration activities aim to locate gold mineralisation by refining key target areas and generating new targets.
Proposed exploration activities will include:
- Completion of the geophysical interpretation and targeting.
- Resource RC drilling at Jungle Well.
- Exploration AC drilling a Brilliant Well.
- Exploration AC drilling along the Clifford Fault at Minotaur Project and Jungle Well.
- Exploration RC drilling at Brilliant Well.
Mineral Resource Statement
Given the positive results and the compilation of PVW Resource NL’s maiden JORC 2012 compliant Resource at the Jungle Well Project, the complete Mineral Resource Estimate summary, and supporting information, including the JORC Table 1, sections 1-3 are included below.
Jungle Well Deposit
November Inferred Mineral Resource Estimate (0.5g/t Au Cut-off)
The Mineral Resource has been compiled under the supervision of Mr. Shaun Searle who is a director of Ashmore Advisory Pty Ltd and a Registered Member of the Australian Institute of Geoscientists. Mr. Searle has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity that he has undertaken to qualify as a Competent Person as defined in the JORC Code.
All Mineral Resources figures reported in the table above represent estimates at November 2019. Mineral Resource estimates are not precise calculations, being dependent on the interpretation of limited information on the location, shape and continuity of the occurrence and on the available sampling results. The totals contained in the above table have been rounded to reflect the relative uncertainty of the estimate. Rounding may cause some computational discrepancies.
Mineral Resources are reported in accordance with the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (The Joint Ore Reserves Committee Code – JORC 2012 Edition).
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