1.   The increase could make it unprofitable for a company to mine underground shafts where the expense of reaching the gold-bearing ore is already high.

2.   A fire killed eight miners in an aging coal mine in eastern Ukraine on Monday, consuming an entire mine shaft, officials said.

3.   Cash-strapped North Korea would get millions of dollars for storing the low-level nuclear waste in abandoned mine shafts.

4.   Some live underground in old mine shafts which they have converted into homes.

5.   Their first mission on Sunday, when they entered the mine from an adjoining mine shaft, failed.

6.   Twelve-year-olds toiling in sweat shops and rickety mine shafts.