The overall investment in developing existing mining concessions has dropped by more than half, to $500 million in 1992, from $1.1 billion.

In addition, he had alienated some of these tribes by selling mining concessions to Spanish interests.

He went out to Africa to look into some mining concessions for the firm.

As a result, 61 mining concessions are located in the park.

They also claimd the policy would lead to more mining concessions.

And they started in on a mining concession over by Husavik, in the northeast, a few months past.

Tom was glad of a chance to learn more about the company which had been granted the mining concession to Ngombia's mineral resources.

There are several mining concessions in the upper reaches of the river.

An American company was offered a mining concession over the entire country in the 1930s but turned it down.

This is in addition to the legal mining concessions, whose numbers, according to miners' unions, jumped from 500 in 2004 to more than 2,600 today.