过去,四川省南桐矿物局开发煤矿时挖出的大量煤矸石都当作废物扔掉,成年累月,平地变矸山,小山变大山,该局几个矿井占用了近千亩土地。而制造矿井支护的混凝土支架所需要的水泥、河沙、碎石子,则需从外地运来,花费很多劳动力。该局支架厂的广大职工,在党的“九大”团结、胜利的路线指引下,向生产的深度和广度进军,大搞综合利用,经过几十天的艰 In the past, a large amount of coal gangue excavated from the development of coal mines in Nantong Minerals Bureau of Sichuan Province was discarded as waste, matured over many years, flatland was transformed into mountains, and hills became large mountains. Several mines in the Bureau occupied nearly a thousand acres of land. The cement, river sand, and gravel that are needed for the construction of the concrete support for the mine support are transported from outside and cost a lot of labor. The workers and staff members of the Bureau’s stent factory marched toward the depth and breadth of production under the guidance of the Party’s “Nine Major” unity and victory route. They engaged in comprehensive utilization and experienced tens of days of hardships.