Estimates for the value of the gold which might be extracted through open-pit mining are as high as $20 billion.

However, only a few billion tonnes are thought to be recoverable in practical terms through open-pit mining.

It is estimated that approximately 90% of the Alberta oil sands are too far below the surface to use open-pit mining.

On the atmospheric response to urbanization and open-pit mining under various geostrophic wind conditions.

It has its origin in pebble extraction by open-pit mining.

That was long before open-pit mining was thought of, either.

The scars of open-pit mining on this scale endure.

It was formed after the flooding of a former open-pit mining which started in 1958.

The near surface resource is believed to be recoverable through conventional open-pit mining.

To stay alive, the company switched to open-pit mining, a very area-consuming method.