Continued depletion of economically attractive seams and the  need to shift new investment to deposits that are less easy-to-mine and/or more distant from existing infrastructure is expected to drive supply costs further upwards, especially if extraction rates keep rising rapidly.

句子的结构倒不是非常复杂，主要是有几个奇怪的单词，希望高手能稍加指点。

背景：本文出自世界能源展望2011第11章第399页，上下文主要讲的是煤炭价格在过去几年中持续上涨的情况和原因的简单分析。