国立莫斯科矿业大学与开采含铁石英岩的采选公司合作,研究和论证了更新露天矿台阶穿孔技术的合理性。提出了一种联合穿孔工艺,其实质是以加大的孔网尺寸先用普通风动潜孔钻机或液压冲击钻机穿凿直径较小(150～170mm)的深孔,再用热力钻机扩孔,所用的热力钻机是国立莫斯科大学与加拿大几家公司共同研制的。 In cooperation with the mining and mining company that produces ferrous quartzite, the Moscow State University of Mining and Technology has researched and demonstrated the rationality of upgrading the perforation technology in the open pit mine. A joint perforation process is proposed. The essence is to drill a deep hole with a smaller diameter (150 ~ 170mm) with an ordinary pneumatic down-hole drilling machine or a hydraulic impact drilling machine with an enlarged mesh size, Thermal drilling rig used by the National University of Moscow and several Canadian companies jointly developed.