The working conditions were poor, especially when using fire-setting, an ancient mining method used before explosives became common.

Some mining methods may have significant environmental and public health effects.

"The old mining methods were not as adept at generating pure titanium."

Well, I was thinking- we've got scientists here working on new mining methods.

At the same time the mining method is designed to ensure that no waste rock needs to be hauled to the surface.

The high walls and unique look to the area was the end-result of this mining method.

The initial mining methods led to many fractures in the rocks which allowed oxygen to enter the rock.

The primary underground mining method used was known as cut and fill.

The mine did not produce any gold until 1963 when more modernized mining methods were introduced.

Williams immediately introduced wide changes in the mining methods at Kimberley.