Development of Tungsten Ore Industry-VII

Carpentaria Exploration Ltd continued work at its Broken Hill tin and tungsten project north of Broken Hill in NSW, which contain the historical Euriowie, Waukeroo and Kantappa Tin Fields, and the Yanco Glen scheelite (tungsten) deposit 40 kilometres north of Broken Hill. In 2012, Carpentaria undertook a drilling program at Yanco Glen to confirm the previous resource and test possible extensions. In October 2012 the company announced updated Inferred Resources of 3.4 Mt at 0.11% WO3, using a 0.05% WO3 cut-off, for a contained 3.95 kt of WO3, doubling the previous amount of tungsten. At the Yanco Glen deposit tungsten is present as scheelite and minor wolframite in stratabound mineralisation, occurring within high-grade gneiss (metavolcanic precursor?) and metasediments of the Paleoproterozoic Broken Hill Group. Carpentaria have been undertaking metallurgical test-work as well as a mining scoping study.



 

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Development of Tungsten Ore Industry-VI

In April 2008, Peel Exploration Ltd (Peel) released an Inferred resource estimate of 1.29 Mt at 0.61% WO3 and 0.05% Mo, at a cut-off of 0.2% WO3 equivalent, for the Attunga deposit 20 kilometres north of Tamworth in NSW. Peel followed this up in 2010-11 with a study to investigate development options which indicated conditions were favourable for a low capital expenditure operation. Mineralisation at Attunga occurs within skarns developed at the contact of a lime-rich sequence with the Permian-Triassic Inlet Monzonite. In late 2012 Peel indicated it had begun a review of the Attunga deposit and was seeking potential joint venture or off-take partners. In August 2013 Peel completed one diamond drill hole for metallurgical test-work.



 

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Development of Tungsten Ore Industry-IV

In May 2013, Tungsten Mining NL (Tungsten Mining) announced a maiden JORC Code resource for its Kilba Project, 320 kilometres northeast of Carnarvon, in the Gascoyne region of WA. The company reported that the prospect has Indicated Resources of 1.3 Mt at 0.3% WO3 and Inferred Resources of 3.7 Mt at 0.26% WO3. Resources are from two zones (zone 8 and zone 11) with a total contained tungsten content of 10.8 kt. Tungsten mineralisation is present as scheelite associated with skarns and calc-silicate units within sediments that host the Paleoproterozoic Kilba Granite. In June 2013, Tungsten Mining announced that it had completed a positive preliminary scoping study based on mineral resources—not reserves, which led it to initiate a definitive feasibility study to upgrade the mineral resource estimate through infill drilling in zone 8 and zone 11. The study is due for completion by the second quarter of 2014.



 

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Development of Tungsten Ore Industry-V

In 2012-13, Thomson Resources continued exploratory drilling of magnetic targets within the southern part of the undercover Thomson Orogen in northwest NSW. Drilling on the eastern flank of the company's F1 anomaly (Falcon project) in early 2013 intersected anomalous tungsten (best intercept of 0.3% W over one metre), molybdenum and minor gold (Au) in what may be a zoned system. Previously, Thomson Resources reported on earlier drilling on other prospects in the Thomson Orogen which intersected evidence of mineralised hydrothermal systems. Two of these targets (Cuttaburra project) gave high grade polymetallic intercepts, with grades up to 3.7 grams per tonne (g/t) Au and to 113 g/t silver (Ag) as well as to 0.4% Bi, to 0.5% Cu, to 1.8% Pb, to 0.8% Sn, to 0.6% W and to 4.25% Zn. Mineralisation is reported to occur as sheeted and stockwork veins up to one metre wide within zones of altered basement rocks of the Thomson Orogen. On the basis of the polymetallic assemblages and presence of granite, Thomson Resources has suggested an intrusion related gold style of mineralisation for the mineral systems intersected so far. Tungsten, present as scheelite, appears to be a common feature of the majority of these mineral systems.  Thomson Resources announced in June 2013 that it had reached agreement with Cuttaburra project joint venture partner Raptor Minerals Ltd to acquire 100% of the project.

 

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Development of Tungsten Ore Industry-III

Newcrest Mining Limited (Newcrest) released updated reserve and revised resource figures in December 2012 for its O'Callaghans polymetallic tungsten-copper-zinc-lead skarn deposit about 10 kilometres south of Telfer in WA. The company reported Probable Reserves of 59 Mt grading 0.28% WO3, 0.29% Cu, 0.62% zinc (Zn) and 0.3% lead (Pb), with a contained 0.16 Mt of WO3, all within Indicated Resources of 69 Mt grading 0.34% WO3, 0.29% Cu, 0.55% Zn and 0.27% Pb, and Inferred Resources of 9 Mt grading 0.25% WO3, 0.24% Cu, 0.15% Zn and 0.07% Pb. Mineralisation occurs within a sub-horizontal polymetallic skarn at the contact between the Neoproterozoic O'Callaghans granite and limestone of the Proterozoic Puntapunta Formation. Newcrest has previously indicated it is undertaking a pre-feasibility study into the deposit. Based on its 2011-12 results, Newcrest was indicating potential development of the O'Callaghans deposit within the next five years, subject to board approval.



 

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