It's difficult to capture the depth of the "Big Hole" in Kimberley but the height of the buildings give an idea of the scale. It's a real vertical wall of rock.

Kimberlite, an ultramafic igneous rock and a rare variant of peridotite, is most commonly known to be the main host matrix for diamonds. It is named after Kimberley where diamonds were mined from this hole.

Kimberlite occurs in the Earth's crust in vertical structures known as kimberlite pipes, as well as igneous dykes and can also occur as horizontal sills. The consensus on kimberlites is that they are formed deep within the mantle, hence at high temperatures and pressures.

HWW to everyone. Have a great day!