The Tennant Creek gold orefield belongs to iron oxide type copper-gold (IOCG) deposit, ore-bearing parts all present high aeromagnetic anomalies. The outcrop of orebody in the area is mainly limonite,while deep part is magnetite. High-grade gold is usually situated at bottom part of iron ore;and presents veinlet-disseminated occurrence. To further prospect IOCG deposit has car-ried out large scale airborne magnetic prospecting for 28904 blocks in Tennant Creek gold orefield. After analyzed aeromagnetic-strati-graphic features comprehensively has delineated 17 aeromagnetic anomalies. In which,2 anomalies after surface verification have found large limonite mineralized zone with Au anomalous indications. If carrying out drilling verification for other anomalies next, can be proved IOGC type gold ore existed in deep part,thus large scale airborne magnetic prospecting will be an effective prospecting method in Tennant Creek gold orefield.%Tennant Creek金矿田矿床类型属铁氧化物型铜金矿(IOCG),含矿部位均呈现高的航磁异常.本区矿体地表露头以褐铁矿为主,深部以磁铁矿为主,高品位的金通常位于铁矿体底部,呈细脉-浸染状产出.为了进一步寻找IOCG型矿床,在Tennant Creek金矿田内28904区块开展了大比例尺航空磁法工作,综合分析航磁-地层特征,圈出航磁异常17处.其中2处异常经地表查证,发现了大型褐铁矿化带,并有Au异常显示.下一步若对其它异常进行钻探验证,证明其深部存在IOGC型金矿,则说明大比例尺航空磁法测量在Tennant Creek金矿田是有效的找矿方法.
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