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EPM’s 14079, 14476, 16265 (part), 16327 & 18717 (Esk Copper and Gold project – 327.8 km2) in the New England Orogen is located in southeast Queensland between the towns of Gayndah and Goomeri, 215 km due northwest of Brisbane. ActivEX Limited holds 100% interest in all tenements.
The prospects are situated at the intersection of the NNW trending Perry Fault zone (host to Mt Rawdon +2Moz gold deposit) and NE trending (Darling Lineament related) structures.
The Esk Copper and Gold project is host to mineralisation with similarities to many High-K Calc-alkalic to Alkalic Porphyry copper-gold deposits, near surface supergene copper deposits, as well as potential for breccia-pipe hosted gold-copper deposits.
Significant drilling intersections from the White Horse prospect on the Booubyjan EPM include:
Exploration targeting concepts include:
The Esk Copper and Gold project is located in southeast Queensland between the towns of Gayndah and Goomeri, 215 km due northwest of Brisbane (Figure 1).
The area is currently used for cattle grazing and peanuts are grown on the red soil basalt plains. The majority of the Esk Copper and Gold project area consists of cleared plains with timbered hills to the east and west with some areas of thick lantana and vine scrub. Access to all areas is good, with the Burnett Highway and Isis Highway running through the centre of the EPMs. Numerous secondary roads and farm tracks also provide good access. Previous exploration of the steeper areas has left a network of accessible four-wheel drive tracks.
The Esk Copper and Gold project is situated on the Maryborough 1:250,000 sheet (SG5606) as well as the Gayndah (9246) and Biggenden (9346) 1:100,000 sheets.
Figure 1. Esk Copper and Gold Project location
The project comprises five, 100% ActivEX Limited held tenements (EPM’s 14476, 14979, 16327, 18717 & the eastern portion of 16265 – Figure 2) with a combined area of 327.8 km2.
Table 1. Summary of Individual Tenement Details
Figure 2. Esk Copper and Gold Project Tenements (also showing Barambah Gold Project and Coalstoun Lakes Copper and Gold Projects)
There have been several phases of modern exploration in the Esk Copper and Gold project area. Historical exploration highlights presented below:
The Esk Copper and Gold Project is located within the Silurian to Triassic Northern New England Orogen (NNEO), adjacent to the Perry Fault zone, a major NW trending structure that separates large structural blocks such as the Coastal Block and the Good Night Blocks from the Gympie Block and is host to the Mt Rawdon deposit, Coalstoun prospect and White Horse prospect (Figure 3). The Coastal Block is dominated by interbedded arenite and argillite, chert, jasper, conglomerate, limestone and minor pillow basalts, with widespread low grade metamorphism to lower greenschist facies. The Gympie Block is characterised by greenschist facies metamorphosed Permian to Early Triassic clastic sediments, basic to intermediate volcanics and limestone. The Good Night Block is dominated by fine-grained metasediments (greenschist). The sediments have been intruded by Permian to Middle Triassic granodiorites, monzonites and granites, some of which formed large volcanoes, erupting large volumes of andesitic volcanic debris into the Esk Basin (formerly Esk Trough). Later granitoids developed volcanoes during the late Triassic, blanketing much of the earlier lithologies with rhyolitic volcanics which now cap many of the hill in the Esk Copper and Gold project area (Figure 4).
Figure 3. Esk Copper and Gold Project geology
Figure 4. Esk Copper and Gold Project regional airborne magnetics
The Booubyjan EPM consists of 5 related porphyry copper and gold targets including the highly prospective White Horse prospect. Very little exploration has been completed on the porphyry systems at depth, however extensive geophysical surveying has been completed across all of the prospects including IP, CSAMT and ground magnetics, indicating that the copper and gold system extends at depth. In 2009, a single drill hole (ABJ014) was designed to test mineralisation below White Horse, intersecting 290m at 0.13% copper. Significant potential exists for higher grade copper mineralisation in this area. Recent drilling, targeting enrichment at shallow depths, intercepted shallow, high grade copper up to 28m at 0.96% copper, resulting in an in-house resource estimate of 1.66 Mt at 0.53% copper (non-JORC compliant).
The Stockhaven EPM consists of 6.5 km2 of anomalous copper related to extensions the Ban Ban Zinc Skarn. Previous exploration companies have predominantly focused on zinc and lead mineralisation held within MDL 409, acting as a blinder to related copper mineralisation which has been delineated by ActivEX. Globally, deposits of this style (called skarns) are typically zoned in their metal content and ActivEX believes the skarn deposits found throughout the Stockhaven EPM fit this characteristic. Drilling completed outside MDL 409 is very limited. The drill holes were also vertically orientated, targeting the subvertical skarn lenses, suggesting that the drill holes failed to test extensions of the Ban Ban Zinc Skarn.
The Dadamarine EPM consists of two copper and molybdenum targets akin to the porphyry systems within the Coalstoun Lakes and Booubyjan EPMs. Previous drilling of these prospects have returned up to 3m at 0.13% molybdenum (SEF08) with only two drill holes exceeding 130m depth (maximum drill hole depth of 240.8m) allowing significant potential to remain at depth. A number of highly anomalous IP targets also remain untested.
The Blairmore EPM consists of three, heavily altered lithocap targets, believed to be caused by possible porphyry mineralisation (e.g. Coalstoun and White Horse mineralisation style) at depth. An in depth analysis of the alteration exhibited over these targets, bear similarities to alteration seen at the Far Southeast porphyry in Lepanto, Philippines (657 Mt at 0.65% copper and 0.94 g/t gold). Two drill holes were completed by CRA exploration directly below the Demonbanga lithocap with little understanding that mineralisation at depth is typically in neighbouring terrain rather than directly below altered lithocaps.
The Ban Ban EPM consists of three, lithocap targets, similar to that seen in the Blairmore EPM, suggesting that possible porphyry mineralisation at depth may extend along the Perry Fault zone. No drilling has been completed within the EPM to date.
The Esk Copper and Gold Project is located in the New England Orogen, 75km west of Maryborough in southeast Queensland.
Potential exists to extend and upgrade shallow high grade supergene copper mineralisation at the White Horse prospect. Also to discover copper mineralisation at depth below the White Horse supergene copper zone and also for analogous Coalstoun/Cadia style mineralisation.
The Esk Copper and Gold Project is a large tenement package prospective for copper and gold mineralisation and contiguous with ActivEX Limited Barambah Gold Project.