However, the rapid development began to cause environmental problems, including the building over former pit mines which had later been used as landfills.

A feasibility study on a larger open pit mine was being prepared.

And base camp is like an open pit mine, in the middle of a desert never touched since time began.

The open pit mines pose both hazards, but some find them to have a kind of beauty as well.

This open pit mine would develop, over the years, into one of Europe's biggest copper mines.

An open pit mine began operation in 1882, and moved to underground mining by 1900 for safety reasons.

By 1895, 2300 tons of asbestos were being removed from the open pit mine per year.

It is also an open pit mine and produces copper.

The many smaller open pit mines developed in the area soon merged into one large mine.

Portable tracks have often been used in open pit mines.