open-cast mining

例句：

1. 1. Open-cast mining is a method of extracting ore from the earth's surface.
   露天开采是一种从地表提取矿石的方法。
2. 2. The company has been using open-cast mining for decades to extract valuable minerals.
   该公司几十年来一直使用露天开采来提取有价值的矿物。
3. 3.Due to environmental concerns, open-cast mining is being phased out in favor of more sustainable methods.
   由于环境问题，正在逐步淘汰露天开采，转而采用更可持续的方法。