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Global Resouces Corporation Limited (GRCL) holds a significant number of mineral exploration tenements in Queensland with the potential for major deposits. Granted tenements are predominantly in the region south of Cloncurry and in the Burdekin area south of Townsville. The company’s recent exploration strategy is to assess open ground across Queensland for prospective gold, base metal, and phosphate deposits. This program identified large tracts of open ground over which GRCL has recently lodged tenement applications.
Project Areas (containing granted tenements and tenement applications) and target types:
- South Cloncurry - Iron Oxide Cu-Au, Broken Hill type (BHT) Ag-Pb-Zn, and phosphate.
- Dobbyn – Structurally controlled Oxide Cu
- Burdekin - Epithermal Au-Ag.
- Monto- Epithermal Au-Ag, and Porphyry and skarn Cu-Au.
- Clermont - Porphyry Cu- Au-Mo and epithermal Au-Ag
- Charters Towers - Intrusive and breccia related Au
- Georgetown - Intrusive and breccia related Au
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South Cloncurry Project Area |
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The Mt Isa block is a geological terrain with a world class endowment of base metals in a variety of settings. Exploration in the South Cloncurry project area is focused on searching the southern part of the Mt Isa block for large Pb-Zn-Ag Broken Hill type (BHt) deposits, large iron oxide associated Cu-Au deposits (IOCG), and high grade phosphate deposits.
Many of the areas that GRCL holds, particularly in the search for IOCG and BHt deposits, are in the under-explored southern area, where younger sedimentary cover conceals the host Proterozoic basement. GRCL’s first and only drillhole into the Kennedy Highway BHt target intersected what is thought to be the outer part of a significant BHt alteration system.
Tenements 100km south of Mt Isa have been applied for to search for high grade Cambrian phosphate rock deposits on the edge of Proterozoic outcrop. These tenements contain the Cambrian stratigraphy that hosts major phosphate deposits at Ardmore and Phosphate Hill, located about 15km and 85km to the east respectively. The Cambrian sequence is thought to be mostly less than 100m thick, and recent work by Krucible Metals Ltd. at their Korella deposit has shown that small high grade phosphate deposits are potentially economic even at moderate depths of about 70m.
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The Dobbyn project comprises of several EPM applications north of Cloncurry. The tenements cover the same stratigraphic sequences and extensions to sets of structures that host stratiform and vein related Cu mineralisation at the nearby Mt Watson, Mt Oxide, and Gunpowder Cu mines, and exploration will be directed at discovering oxide and sulphide Cu deposits in fault related veins and breccias.
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The Burdekin Project encompasses Permian volcanic stratigraphy in the lower parts of the Bowen Basin that is known to host a significant Au-Ag-Cu deposit at Conquest Mining Ltd’s Mt Carlton Project, about 10km south of the project area. Exploration on the Burdekin Project area is focused on searching for epithermal Au-Ag deposits and breccia hosted Au deposits. Recent exploration has revealed evidence for both styles of mineralisation.
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The Monto Project comprises two separate tenement holdings.
Exploration on the Theodore tenement will focus on epithermal Au-Ag mineralisation. The tenement contains the same lower Permian Volcanic stratigraphy that hosts the Cracow Epithermal Au-Ag deposits 60km to the south, and the volcanic sequence is equivalent to that which hosts the Silver Hill Au-Ag-Cu deposit in the Bowen Basin.
The Diglum tenement contains a sequence of Devonian- Carboniferous volcanic and sedimentary rocks that have been intruded by a Permo- Triassic granodiorite. Targets for exploration include porphyry style Cu-Au-Mo mineralisation on the periphery of the granodiorite, and skarn Cu-Au mineralisation in distal magnetic anomalies.
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Exploration in the Clermont Project area is for porphyry related Cu-Au-Mo, and epithermal Au-Ag mineralisation. The project area encompasses the contact between the Early Paleozoic Anakie Metamorphics in the east and Cycle 1 volcanics and sediments of the mid- Paleozoic Drummond Basin to the west. Many of the known epithermal gold deposits to the north are located close to this contact (eg. Belyando, Twin Hills, and Yandan) as does a Porphyry Mo deposit recently discovered by Zamia Metals Ltd at the Anthony Prospect.
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Charters Towers Project Area
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The Charters Towers project area is centered on the historic gold mine at Hadleigh Castle some 35km east of Charters Towers. The Charters Towers Block contains a diverse range of Early and Late Paleozoic intrusive and extrusive sequences and is host to several multi-million ounce gold deposits in a variety of settings. Exploration will be directed at searching for large Au deposits in mesothermal granite hosted veins and sub-volcanic breccias similar to Charters Towers and Mt Leyshon/ Mt Wright respectively.
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The Georgetown Project comprises of two groups of tenements in the Gilberton- Mt Hogan and Croydon areas.
The Gilberton –Mt Hogan group of tenements cover parts of historical goldfields mined as recently as 15 years ago, and they contain a diverse range of Proterozoic and Early Paleozoic metasediments and granitoids occurring along- and adjacent to a major NE oriented fault. The tenements are prospective not only for mesothermal vein related Au deposits, but also sub-volcanic breccias, and epithermal Au-Ag mineralisation similar to those occurring along the same major NE oriented structure at Kidston to the northeast and Woolgar to the southwest.
The Croydon Group of tenements covers parts of the historical Croydon Goldfield that has recorded production of >1 million ozs Au. Mineralisation occurs in plutonic (mesothermal) quartz veins and as historical gold production has been sourced from workings mostly less than 100m deep, GRCL believes there is potential for significant gold deposits below this level.
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