Changlegou iron deposit occurred in the contact zone of the grey biotite garnet plagiogneiss and the amphibolite. The ore-host strata are the Douling group of palaeoproterozoic. The ore body occurrences are basically identical with the wall rock occurrences, and the gangue minerals species and the altered rocks in the ore are basically identical with the mineral species and the altered rocks in the wall rock. The deposit has the sedimentary metamorphic iron deposit characteristics which occurred in the amphibolitic rocks. The formation of the deposit is closely related to paleogeography and ancient landform etc. metallogenic conditions, and the prospecting signs of the deposit are the dark amphibolite and the magnetite ore gravels in the residual materials and slope washes.%常乐沟铁矿床产于灰色黑云石榴斜长片麻岩和斜长角闪岩的接触带之间,赋矿地层为古元古界陡岭岩群,矿体产状与围岩基本一致,矿石中脉石矿物种类及蚀变与围岩基本一致,矿床具有产于角闪质岩石中的沉积变质铁矿床特征。矿床的形成与古地理及古地形等条件密切相关,找矿标志为暗色的斜长角闪岩和残坡积物中的磁铁矿砾石。
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