Sanshandao gold mine，belonging to Shandong gold mining （Laizhou） Co.，Ltd.，is located at Laizhou Bay of the northwest of Jiaodong Peninsula，Shandong Province.The surface of gold mine is covered by river，sea，roads and village，so Sanshandao gold mine is a typical three-underground mine.The purpose of this paper is to optimize the technology and control measures of the “three-underground” mining mine.Through analysis of “three-under” mining case of Sanshandao gold mine， the mining technical conditions was analyzed through investigation， simulation and monitoring methods， and the impact of “three under” mining on the surface was analyzed combined with the relevant parameters of the filling method.The main research objects are protected top pillar and mining sequence.The method of room and pillar alternately raised mining with backfill could reduce rate of ore loss.The rate of ore loss was reduced from 13% to 4%，which demonstrated the suitability of the method.Mining sequence is another object that influence mining safety and stability.Four mining plans were conducted by simulation models：Mining sequence of plan-1 was mining from one side to another；Mining sequence of plan-2 was mining from center to sides；Mining sequence of plan-3 was mining one every the other two panels；Mining sequence of plan-4 was mining from sides to center.Finally，the optimized mining sequence is plan-3.Fault was the major factor in mining safety，and F₃ fault in Sanshandao gold mine have leaded to several water inrush accidents，so roadway engineering should keep away from F₃ fault.But some roadways have to go through the F₃ fault in reality.The first measure was reinforced the fracture zones by advance grouting.And put some pipes into the fracture zones in order to improve the engineering geological condition.For surface water body，the patrol system and emergency plan were set for prevent intrusion.In Sanshandao gold mine，345 GPS monitoring points were set to monitor surface deformation.The cover range of monitoring was 8.5 km².The mining engineering influence was minimized to surface subsidence which showed the technology and measures were effective.In underground mining，IMS micro-seismic monitoring system was set in Sanshandao gold mine in 2012.A set of system of working in real time，dynamically，automatically was built for ground pressure monitoring.This system provided support for mining engineering safety and efficient.The mining engineering was also implemented based on principle of production-learning-research combination.Appropriate mining technical scheme and controlling measures are the guarantee of mining stability and sustainability.

http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-5-734.shtml