甘肃省徽县东北金矿床开采条件分析

MINING CONDITIONS OF DONGBEI GOLD DEPOSIT IN HUIXIAN COUNTY,GANSU PROVINCE

甘肃省徽县东北金矿床含矿围岩为丹凤群黑湾里组a、b两个岩性段,该岩性段属于弱—中等富水含水岩组,岩石中结构面较发育,但岩石充水量较小。含水岩组划分为第四系松散层孔隙水含水岩组和基岩裂隙水含水岩组,是以基岩裂隙充水为主的矿床,基岩裂隙水补给单一,富水性弱—中等,开采受突水灾害影响程度弱。矿体及顶、底板岩体总体完整性及稳定性较好,工程地质类型为坚硬岩为主的矿床,工程地质条件中等。另外,文中对采矿中面临的水工环地质问题提出了防治对策建议。

Located in the northeast of Huixian County,Gansu Province,the ore-bearing wall rocks of the Dongbei gold deposit are composed by two lithologic sections a and b in the Heiwanli Formation of the Danfeng Group.The lithologic sections belong to a weak medium water rich rock group.The structural plane in the rock is relatively developed,but the water charge in rocks is small.The water-bearing rock group is divided into Quaternary pore water in loose layers and bedrock fissure water-bearing formation.It is a deposit mainly filled with bedrock fissure water.The bedrock fissure water supply is single,the water yield is weak to medium,and mining is weakly affected by water inrush.The overall integrity and stability of the ore body,roof and floor rock masses are good.The geo-engineering type is mainly hard rock deposit with medium engineering geological conditions.This paper also puts forward some countermeasures and suggestions for geological and hydraulic environment problems possible occurring in mining.