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Discovery and Geology of the McPhee Creek Iron Deposit, Northern Pilbara, Western Australia

机译：西澳大利亚州北皮尔巴拉市McPhee Creek铁矿床的发现和地质

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摘要

The McPhee Creek bedded iron deposit is a recent discovery made by Giralia Resources NL (Giralia)rnin the northern Pilbara of Western Australia. The deposit lies 30 km north of the town of Nullaginernalong the southeastern margin of the East Pilbara Granite-Greenstone Terrane (EPGGT).rnThe McPhee Creek area is located in the Kelly Greenstone Belt in the southeastern part of thernEPGGT. The Archaean aged greenstone belt consists of volcanic and sedimentary sequencesrnincluding the Warrawoona Group and the Gorge Creek Group. The McPhee Creek iron orerndeposit lies within banded iron formation (BIF) rocks of the Gorge Creek Group. The structurernof the McPhee Creek area is dominated by a northeast trending, upright synform (Sandy CreekrnSyncline) and associated folding that is truncated by northeast trending faults in the east. Ironrnore mineralisation is predominantly stratabound and follows the dip of the bedding – however,rnin some areas, particularly in the southwest of the deposit, mapped steep to moderate dips ofrnbedding planes are at odds with underlying fl at mineralised zones in drill sections. Zones withinrnthe deposit that contain substantial thickness of iron ore correspond to areas of complex foldingrnsuggesting structural control and iron enrichment in fold hinges. Petrographic analyses confi rmrnmineralisation is goethite dominant and the deposit is strongly supergene enriched.rnGiralia initially identifi ed iron ore potential in the McPhee Creek area through the presence of a smallrnknown channel iron deposit (CID) mesa. Giralia began exploration in 2008 by re-drilling a portionrnof the CID (subsequently named Crescent Moon) and reported a small low-grade Inferred MineralrnResource. Target generation in the wider area utilising Geological Society of Western Australia mapsrnand Ikonos satellite images identifi ed strongly ferruginous outcrops associated with major structuresrnalong an 8 km long range located 2.5 km to the west north-west of the Crescent Moon CID deposit. Inrnlate July 2008, a total of 62 rock chip samples were collected during a helicopter supported samplingrnprogram conducted at McPhee Creek. Samples taken from haematite-goethite enriched BIF andrncanga zones outcropping intermittently over the 8 km length of the western and central areas of thernprominent range assayed up to 63 per cent Fe. These zones represent the discovery outcrops andrnsurface expression of the McPhee Creek main range iron ore deposit.rnFollow up sampling, geological mapping, bulldozing of access tracks and ramps and reverserncirculation (RC) drilling commenced in September 2009. A maiden Inferred Mineral Resourcernwas announced by Giralia to the Australasian Securities Exchange (ASX) on 15 December 2009.rnThe current Indicated and Inferred Mineral Resource at December 2010 stands at 260 Mtrngrading 56.2 per cent Fe, 0.12 per cent P, 6.7 per cent SiO2, 2.3 per cent Al2O3 and 9.5 per cent LOIrnat a 50 per cent Fe cut-off. McPhee Creek is one of the largest iron deposits found in Archaean BIFrnin the northern Pilbara.
机译：McPhee Creek层状铁矿床是西澳大利亚州北部Pilbara的Giralia Resources NL（Giralia）rn最新发现的。该矿床位于东皮尔巴拉花岗岩绿岩地带（EPGGT）东南边缘的Nullaginernalong镇以北30公里处。麦克菲溪区位于rnEPGGT东南部的凯利绿石带中。太古时代的绿岩带由火山和沉积层序组成，包括沃拉沃纳群和峡谷溪群。 McPhee Creek铁矿床位于Gorge Creek集团的带状铁矿（BIF）岩石内。 McPhee Creek地区的构造以东北向，竖立的同形物（Sandy CreekrnSyncline）和相关的褶皱为主，而该褶皱被东部的东北向断裂所截断。 Ironrnore的矿化作用主要是地层约束，并且随地层倾角而变化–但是，在某些地区，特别是在矿床的西南部，测绘的陡峭至中等倾角的地层平面与钻探段矿化带的下伏面不一致。矿床内含有大量铁矿石厚度的区域对应于复杂的褶皱区域，这暗示着构造控制和褶皱铰链中的铁富集。岩石学分析证实矿化作用以针铁矿为主，且该矿床富含大量超成因。吉拉利亚（Giralia）最初通过存在一个已知的小槽铁矿床（CID）台地来确定麦克菲溪地区的铁矿石潜力。 Giralia于2008年开始勘探，方法是重新钻探CID（后来称为新月形月亮）的一部分，并报告了一个小型的低品位推断矿产资源。利用西澳大利亚州地质学会mapsrnand Ikonos卫星图像在更广泛的区域中生成目标，这些新发现的与主要结构相关的强烈铁质露头在距离新月CID矿床西北西北2.5 km的8 km长范围内。自2008年7月起，在麦克菲溪（McPhee Creek）进行的直升机支持的采样程序中，总共收集了62个岩屑样品。从富集赤铁矿-针铁矿的BIF和rncanga带中抽取的样品在显着范围的西部和中部区域的8 km长间断地露头，测定出的铁含量高达63％。这些区域代表了McPhee Creek主范围铁矿石矿床的发现露头和地表表达。rn跟进采样，地质制图，通道和坡道推土以及反循环（RC）钻探于2009年9月开始。Giralia宣布了首个推断矿产资源于2009年12月15日提交澳大利亚证券交易所（ASX）。rn截至2010年12月，目前的指示和推断矿产资源为260 Mtrngrad，其中铁含量为56.2％，磷含量为0.12％，二氧化硅含量为6.7％，氧化铝含量为2.3％，氧化铝含量为9.5％。最低品位为铁的50％。麦克菲溪（McPhee Creek）是在皮尔巴拉（Pilbara）北部的古生菌BIFrn中发现的最大铁矿之一。

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  • 来源
    《Iron ore 2011》|2011年|p.93-101|共9页
  • 会议地点 Perth(AU)
  • 作者

    J D Goldsworthy; R M Joyce; P Bonato; A DHulst;

  • 作者单位

    Business Development, Gascoyne Resources Ltd, PO Box 1449, West Perth WA 6872. Email: julian@gascoyneresources.com.au;

    Giralia Resources NL, PO Box 1665, West Perth WA 6872. Email: mjoyce@zenithminerals.com.au;

    Atlas Iron Limited, PO Box 7071, Cloisters Square WA 6850. Email: Paul.Bonato@Atlasiron.com.au;

    Zenith Minerals Limited, PO Box 1426, West Perth WA 6872. Email: alan@zenithminerals.com.au;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
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