opencast survey

例句：

1. 1.The open-pit mining company conducted an extensive open-pit survey to assess the feasibility of a new mine project.
   这家露天矿开采公司进行了广泛的露天矿床调查，以评估新矿项目可行性。
2. 2. The government has launched an open-pit survey to gather data on the environmental impact of the construction project.
   政府已经启动了一项露天矿床调查，收集有关建设项目对环境影响的数据。
3. 3.The open-pit survey revealed that the area had been heavily mined and required significant restoration efforts.
   露天矿床调查显示，该地区已被严重开采，需要进行大量的恢复工作。