It's an open-pit mine, formed around a kimberlite pipe, a rare type of volcanic rock formation that can contain high ...

It is an open-pit mine, formed around a rare volcanic rock formation called a kimberlite pipe, which contains high ...

Among the more curious materials that occur naturally on the Earth are volcanic rocks called kimberlites. Unusually rich in magnesium, many of them also host notable quantities of elements as ...

Those discovered at the surface have been carried there by unusual, explosive volcanoes called kimberlite pipes, which traverse the crust from bottom to top, erupting at ground level. Dr Gernon ...

Mining here is a high-tech operation. Workers use powerful drills and controlled explosions to break up the earth, then ...

Professor Steve Sparks, School of Earth Sciences Volcanology Group While kimberlites - effectively small volcanoes - have long been the primary source of diamonds, the process by which they are formed ...