矿道结构鸟瞰图:石石石石石石石石石空空空空空空石石石石空石石石石石石石空石石石石石空空空空空空石石石石空石石石石石石石空石石石石石空空空空空空石石石石空石石石石…………中间那条竖着的是主干道其他的是矿路均可无限延伸按这种挖法,可以井井有条地获得此处所有矿藏