First , some may depend on natural resources , such as a coalfield or a harbour .
第一，有些企业是因为对自然资源的依赖性，比如煤田或者港口。
Yulin city shenfu coalfield leading group office .
榆林市神府煤田开发领导小组办公室。
The affinity of associated elements in permian coals from the huaibei coalfield .
淮北煤田二叠纪煤中伴生元素的亲和性研究。
Yulin prefecture shenfu coalfield industry and trade corporation , the installation company .
榆林地区神府煤田工贸总公司安装公司。
However , international mining executives have expressed deep frustration at slow progress in setting the terms of foreign involvement in projects such as oyu tolgoi and the tavan tolgoi coalfield .
