对地下矿的残留储量,进行露天二次开采,是已开发区域内有色冶金矿山企业弥补其消失生产能力的途径之一。露天和地下平行开采的矿床,为二次露天开采的发展创造了最有利的条件。杰兹卡兹甘铜矿床为其典型实例。这里地下开采仍在进行,而露天开采已进入末期,向二次露天开采过渡,可以回收地下开采损失的矿石储量,并使区域生产潜力得到利用。杰兹卡兹甘矿床基本呈缓倾斜(6°～8°)赋存,由北向南倾斜。在矿床北翼分布有兹 The remaining reserves of underground mines, the second open-pit mining, is the development of non-ferrous metallurgical mining enterprises in the region to make up for its disappearance of production capacity of one of the ways. The deposits mined open-air and underground parallelly create the most favorable conditions for the development of the secondary open pit mining. The Jetskazan copper deposit is a typical example. Underground mining is still going on here, and open-pit mining has entered its final phase of transition to secondary open-pit mining to recover lost ore reserves underground and to harness the potential of regional production. The Gezkazgan deposit is basically gently inclined (6 ° -8 °) and tilted from north to south. There are distribution in the north wing of the deposit