砂岩型铀矿地浸浸出液溶质运移过程的综合地球物理监测

采用地浸方式开采砂岩型铀矿,对地浸溶液的浓度梯度分布范围及溶质运移过程的监控极为必要.本文利用在内蒙古二连盆地某砂岩型铀矿山进行的一组以CSAMT和TDIP地浸浸出液分布探测试验,对地浸矿山浸出液分布范围和溶质运移过程进行深入研究.结合研究区域的地质、水文、岩层电阻率测井、岩石极化率和地层电性特征资料,对研究井场的监测结果进行了解译,获得了研究区域井场下方的电阻率二维反演模型和激发极化中梯装置视极化率异常分布模型,初步建立了一套专门针对地浸采铀溶质运移过程的地球物理监测方法.

Comprehensive geophysical monitoring of solute transport in leaching solution of the sandstone type uranium deposit

Uranium extraction methods could be divided into conventional uranium mining and in-situ leaching. Conventional mining is suitable for hard rock uranium resources,whereas ISL is usually adopted for sandstone uranium deposits. ISL is a new mining method by injecting specially formulated leaching solution to recover uranium. Concentration gradient distribution range is surely to be formed accompanied by a series of solute transport process during the leaching course. For the range and process above are closely related to coverage area(rate)of orebody,recovery rate of resources and pollution range,control of underground water and some other important problems,a monitoring job for the range and process is essential.Until now,there are no mature methods both in China and abroad and relevant researches are inadequate. A research on leaching solution range and solute transport process was taken by performing a group of tests of CSAMT and TDIP survey in Erlian Basin in the paper. Combined with the data from regional geology,hydrology,formation resistivity,logging,rock polarizability and characteristics of formation resistivity,the authors gave an interpretation and obtained a 2-D resistivity model and a polarization anomaly distribution model of the structure below the wellfield studied. A suite of geophysical moni-toring methods for solute transport process of in-situ leaching uranium were made.