许多露天矿已将其近地表的地质条件较简单的高品位矿石储量采完。各采矿公司将不可避免地要考虑开采埋藏更深、地质和水文条件更复杂、地压问题更多的矿床,但这类矿床剥采比大,废石量多,且远离市场。在边远地区建矿所需的庞大而昂贵的基础设施,其费用甚至比矿山建设费用还高出许多 Many open-pit mines have taken their near-surface geological conditions with relatively simple high-grade ore reserves. Mining companies will inevitably have to consider the exploitation of deeper buried, more complex geologic and hydrological conditions and more ground pressure problems, but such deposits have a large ratio of stripping and mining, large amounts of waste rock and are far from the market. The huge and expensive infrastructure needed to build a mine in remote areas can cost even more than mine construction costs