内蒙古乌拉特中旗284东矿区金矿找矿新思路

New Idea for Prospecting in No.284 East Mining Area in Urad Zhongqi in Inner Mongolia

乌拉特中旗284东矿区已开展金矿勘查工作多年,但一直未取得较大进展。以往勘查工作认为矿体赋存于破碎蚀变的石英闪长岩中,但矿床规模不大。在对以往地质资料进行分析总结和实地踏勘工作的基础上,提出了区内炭质千糜岩为主要赋矿岩石的找矿新思路,并通过对以往施工钻孔岩心的重新编录和取样分析以及坑道施工,对找矿思路进行了实践。通过地质工作,在炭质千糜岩中发现了金矿体,矿体规模达500 m(走向)×500 m(斜深),为找矿思路提供了强有力的成果支持。新发现的金矿体位于(1)号蚀变带内,受F9断裂控制;矿体存在SW向侧伏规律,在构造交汇及产状变化等部位易形成厚大矿体;矿石具有贫金属硫化物、易见明金的特点,金粒径变化范围较大。依据新思路进行下步找矿工作有望取得较大找矿突破,增加金资源量。找矿新思路的提出不仅为该区金矿勘查指明了方向,也为相邻矿区金矿勘查工作提供了新的启示。

Gold ore prospecting work in No.284 east mining area in Urad Zhongqi in Inner Mongolia has been car-ried out lor many years. However there is no breakthrough. In the former research,i t was regarded that ore bodies occurred in fracture altered quartz diorite with small scale. Based on geological data and fie ld work,i t is put forward that carbonaceous mylonite is major ore-bearing rock. Through core sampling and analysis of the former construction drilling core, a new gold body is discovered in carbonaceous phyllonite with the scale of 500m （ trend） X 500m （dip ）. It provides a powerful support for the new idea. This new gold ore body occurs in ① alteration zone which controlled by F9 fault. The ore body is plunging with the trend of SW. Large ore body can be easily formed in the structures intersection. The metal sulifide content of gold mineralization is low,and the gold can be visable which has a wide range in particle size. According to the new idea,a prospecting breakthrough can be expected at next ex-ploration stage,and more gold reasource will be found. The new idea points out a direction for the mining area and adjacent mining area in the next exploration stage.