我矿是大型凹陷露天矿。为了认真执行“采剥并举、剥离先行”的方针,提高掘沟速度,保证矿山持续高产,在矿党委领导下,成立了掘沟攻关组。广大工人、干部、技术人员以批修整风为纲,在“鞍钢宪法”指引下,开展技术革新,1971年改装了一台长臂电铲,采用斜孔微差挤压爆破和双铲分层(长臂电铲上装车,短臂电铲平装车)掘沟工艺,加快了掘沟速度。1972年,为了加快36米沟的掘沟进度,采用长短臂双铲分层 Mine is a large open pit mine. In order to conscientiously implement the principle of “stripping for others and stripping for stripping first,” increase the speed of digging trenches and ensure a sustained and high-yielding mine, a trenching research team was set up under the leadership of the coal mine committee. The majority of workers, cadres and technicians took the process of appraising rectification and rectification as their key link. Under the guidance of the Anshan Iron and Steel Constitution, they carried out technological innovations. In 1971, they converted a long-arm electric shovel and adopted oblique hole micro-differential blasting and double-shovel delamination (Long arm electric shovel loading, short arm electric shovel loading) Trenching process, to speed up the trenching speed. In 1972, in order to speed up the trench digging 36 meters ditch, the use of long and short arm double shovel