rock ledge

用法例句

By studying the occurance of gold orebodies,the ore types and features and the alteration of wall rocks ,it is found that Xuyaogou gold deposit is a quartz vein-metasomatite type locating in the exocontact zone of Muhuding granodiorite.

　通过对许窑沟金矿床矿体产出特征、矿石类型及特征、金的赋存状态以及围岩蚀变等的研究表明,许窑沟金矿是赋存于牧虎顶岩体外接触带的石英脉-蚀变岩型金矿床。

The characteristics of gold vein are discussed.

本文总结了难采岩金矿脉的特征，针对几种典型的难采矿脉（“香肠状”、“巢状”、“分叉状”、“极薄矿脉”等）选择了采矿方法，指出了应用该采矿方法的技术关键，从而降低矿石损失率和贫化率指标，提高矿山企业的经济效益。