安徽戴家河金矿坑充水影响因素及充水预测研究

戴家河金矿是含金蚀变岩及石英细脉型岩金矿。矿床在开采过程中,矿坑充水影响因素及涌水量的研究为区内岩金矿床提供地质和经验数据。本次矿坑涌水量预测主要采用地表水文地质调查填图和地下水化学取样分析方法,依据该区水文气象经验数据,结合矿体地质特征,采用水均衡法对矿坑的涌水量进行估算。通过上述工作,区内主要分布松散堆积物孔隙水岩组和基岩裂隙含水岩组,对矿坑涌水量影响均小,大气降雨是最大影响因素。统计数据表明:采场外围补给量大于采坑。日暴雨量分别是日最大降雨涌水量和日平均降雨涌水量的5. 16和14. 63倍,矿坑最大涌水量是由于暴雨造成。水化学取样分析结果表明:各含水岩组均为矿化度1g·L~(-1)的低矿化度的淡水,硬度均为1. 5 mg当量/升的极软水,pH值为5. 6～6. 2的弱酸性水,水质类型为HCO_3-Ca。未来供水源可选择区内扫帚河,矿区南部的冲洪积扇地带也可作为供水区。

Study on the characteristics of bearing gold and the state of gold occurrence in Daijiahe gold deposits

Daijiahe gold deposit is a type of altered rock containing gold and quartz fine vein rock. Research of factors affecting mine water filling and quantity of water inflow in pit during mining process provides geological and empirical data for the rock gold deposit in the area. The methods of surface hydrology geological survey and chemical sampling and analyzing groundwater have been applied for the prediction of water inflowing of the pit, based on the meteorological and hydrological empirical data, combined with the geological character of orebody, estimating the water inflow from the pit by using the water balance method Through the above work, the rock group of loose and porous sediments with water and the rock group of bedrock with water in fissures are mainly distributed in the area, which have little influence on the water inflow of the pit, atmospheric rainfall is considered to be the biggest influence factor. Statistical data show that the quantity of slope peripheral supply is bigger than mine pit. The daily storm rainfall is 5.16 and 14.63 times of average daily rainfall inflow, and the maximum water inflow is caused by heavy rainfall. Water chemical sampling and analysis show that the water bearing rocks are mineralized with a salinity of less than 1 g / L. the hardness of the water was 1.5 mg / L, and the weak acid water with pH value of 5.6 ~ 6.2 was found. The type of water is HCO₃-Ca. The source of future water supply can choose the Shaozhou River, the southern mine area can also be used as a water supply zone.