河北司家营研山铁矿氧化矿分布范围重新圈定

Redelineation of the Distribution Scope of Oxidized Ore-body in Sijiaying Yanshan Iron Mine in Hebei Province

根据开采设计,河北司家营研山铁矿的氧化矿主要分布于-112 m水平以上,而实际生产勘探表明,氧化矿的分布范围远大于原勘探圈定的范围,甚至在-127 m水平仍有相当一部分氧化矿分布。氧化矿与原生矿的矿石量比例与开采设计相比发生了较大变化,矿石性质的变化对选矿流程和设备的更替具有重大影响。为重新圈定氧化矿的分布范围,在详细分析矿区原有勘探成果的基础上,对矿区进行了深部补充钻探。共施工了18个钻孔,总工程量为2 006.54 m,采集了415件样品并进行了相关化验分析。通过对补充勘探成果的进一步分析,结果表明:(1)区内深部氧化矿主要呈盖层状、带状分布,前者分布于第四系覆盖的基岩面之下和变质岩的古风化面之下,后者沿破碎带和侵入矿体的辉绿岩脉两侧分布,受破碎带分布范围控制;(2)南端、中部的主矿体较原先变厚,北部矿体变薄;(3)分布于矿体上部的氧化矿(盖层状)氧化程度较高,虽然矿石质量差,但是可以分采;夹杂于原生矿中的氧化矿(带状)一般氧化程度不高,难以分采;(4)-352 m标高以上开采境界内的保有资源储量总计20 956.7万t,其中,氧化矿910.4万t。分析结果为该矿开采工程布置及选矿生产线调整提供了可靠依据。

According to the mining design of Sijiaying Yanshan Iron Mine,the oxidized ore-body is mainly distributed above-112 m level,while the actual production exploration results show that the distribution scope of oxidized ore-body is larger than the one delineated by the original production exploration work of the mining area,especially at-127 m level,considerable amount of oxidized ore-body is still distributed. Compared with the original mining design,ore ratio of oxidized ore-body and primary ore-body is changed greatly,the change of ore property has great influence on the replacement of ore dressing process and equipment. In order to redelineate the distribution scope of oxidized ore-body of the mining area,based on detailed analysis of the original production exploration results of the mining area,supplement exploration of the depth of mining area is conducted. 18 drills are constructed,the total drillling engineering quantity is 2 006. 54 m,415 samples are collected and some related laboratory analysis is done. The supplement exploration results of the mining is further discussed,the results indicated that：（1）oxidized orebody in the depth of mining area is mainly distributed with the shapes of cover layer and ribbon,the former is occurred in the lower of bedrock surface covered by Quaternary and the lower of the ancient weathering surface of metamorphic rock,the later is mainly distributed along the fracture broken belt and the both sides of diabasic dike intruded into ore-body,and controlled by the distribution of fracture broken belt;（2）compared withe the ore-body thickness determined based on the original production exploration results,the main ore-body becomes thicker in the north and middle of the whole oxidized ore-body,while,its north part becomes thinner;（3）oxidation degree of the oxidized ore-body（ with the shape of cover layer）distributed above the ore-bodies is higher than others,though ore quality is poor,the goal of mining separately can be realized; oxidation degree of the oxidized ore-body（ with the shape of ribbon shape） is lower than other,there,it cannot be mined separately;（4）the retained resources reserve in the mining boundary above-352 m level is 209. 567 million t,among them,resources reserve of oxidized ore-body is 9. 104 million t. Some reliable reference for adjustment of mining engineering and layout of ore dressing line of the mine can be provided based on the above study results.