It includes data from over 50,000 oil, gas, and coal fields in 89 countries.

该数据库收集了89个国家5万多个油、天然气和数据。

Is it the world's largest coal field; the world's largest gold source or the world's largest diamond source?

a)有世界最大矿？b)有着世界上最大黄金矿藏？还是 c)有着世界上最大钻矿藏？

A reminder of the diverse communities drawn to the  coal fields in search of work.

一个提醒，展示了被矿吸引来寻找工作多元社区。

Legacy mills, sited in coal fields in America and Europe, might be replaced by plants next door to iron ore mines, fed their electricity by connectors to the local grid.

传统炼钢， 美国和欧洲矿区，可能会被建在铁矿山旁边工所取代，这些工通过连接当地电网来获取电力。

But the Durham coal owners had a wider problem in that a lot of the best coal fields in Durham were quite well inland, in the area around Bishop Auckland.

但达勒姆矿主们面临着一个更大问题， 即达勒姆许多优质都内陆地区，就在主教艾尔沃思镇周边。