大比例尺高精度磁测在卡休他他铁(金、钴)矿生产中的应用

APPLICATION OF LARGE-SCALE HIGH-PRECISION MAGNETIC SURVEY IN IRON(GOLD,COBALT)ORE MINING IN THE KAXIUTATA DEPOSIT

卡休他他铁矿床是20世纪70年代由甘肃省地质六队在内蒙古阿拉善右旗发现的一处中型磁铁矿床,并伴生有钴和金。该矿床由南北2个矿带组成,已由内蒙古庆华集团开采多年。目前正面临资源短缺的局面,为扩大矿山潜在资源,在矿区开展了大比例尺高精度磁测,突出异常细节,可弥补矿床勘探阶段工作比例尺偏小之不足,对提高矿山生产效益,扩大潜在资源量意义重大。文章着重介绍了野外观测技术和室内数据处理方法(磁异常化极、化极向下延拓和交互式二维剖面反演),探讨了地质解释成果在矿山生产中的应用效果。

Kaxiutata iron deposit in Alxa Youqi, Inner Mongolia is a middle - scale magnetite deposit discovered by No. 6 Team of Gansu Geology Bureau in 1970s. It is also accompanied by gold and cobalt mineralization. The deposit is composed of two mineralizing zones, i.e. south and north iron ore zones. Inner Mongolia Qinghua Group has exploited ores for many years. Shortage of iron ores now becomes severe. In order to enlarge iron reserves in the mining area, large - scale high - precision magnetic survey is of great significance to discover potential ore reserves. The survey can make up deficiency of relatively small - scale exploration works at the ore prospecting stage, and highlight the details of anomalies. This paper mainly describes field observation techniques and data processing like reduction - to - pole of magnetic data, downward continuation and data 2 - D inversion）, and discusses their applications to geological explanation and actual effectives in the mining activities.