河北迁安变质铁矿床深部找矿突破及富矿成因探讨

Breakthrough in exploration at depth of metamorphic iron deposit in Qian′an country,Hebei province and discussion on genesis of the rich ore

通过2005年12月—2009年6月实施的全国危机矿山接替资源找矿项目,在河北省迁安铁矿床的深部取得了重大的找矿突破,钻孔见矿率达78.26%,新增铁矿资源量2.43×109t,其中,杏山铁矿C22线XZK0610孔和XZK0618孔均见到厚大矿体,全孔累计见矿进尺厚度分别为209.04m和169.41m。同时在XZK0610孔深915.84～970.33m处为富矿,富铁矿体进尺长度54.49m,w(TFe)最高为59.56%,平均品位53.48%,富矿产于贫矿体中,呈层状产出,贫矿体与富矿体呈互层状,富铁矿体与贫矿层属同沉积-变质成因。

A significant breakthrough was made in exploration at depth of Qianan metamorphic iron de- posit during the execution of resource substitution exploration project of crisis mines. Drill holes were completed with iron ore-hit rate about 78%. Resource/reserve 233 of 2.43×109t was newly located. Drill holes XZK0610 and XZK0618 at C22 line in Xiangshan iron mine all encountered big and thick ore bodies and the accumulative thickness of ore layers hit in the two holes are 209.04 m and 169.41 m respectively and rich iron ore is hit at interval 915.84-970.33 m in drill hole XZK0610. The rich iron ore penetration length is 54.49 m and maximum w（TFe） is 59.56%, the average 53.48%. The rich iron ore layers are in-terbeded with the poor iron ore layers thus the rich and the poor are syn-sedimentary genetically.