Kimberlite "Big Hole"
The "Big hole" or Kimberly Mine, originally referred to as the Colesberg Kopje, is an open-pit mine in Kimberley, South Africa. It is claimed to be the (2cd) largest hole excavated by hand. From 1871 to 1914 up to 50,000 miners dug the hole with picks and shovels, yielding 6,000 pounds of diamonds. The underground Kimberley Mine was mined to a depth of well over 1/2 mile (1,097 meters). It was closed in 2005. There are efforts underway to make it a World Heritage Site.
Kimberlite is a type of potassic volcanic rock best known for containing diamonds. It is named after the town of Kimberley, in South Africa. The morphology of kimberlite pipes, and the classical carrot shape, is the result of explosive diatreme volcanism from very deep mantle derived sources. Volcanic explosions produced vertical columns of rock that rose from deep magma reservoirs.
This material was legally obtained and acquired. It is from the "Big Hole" locale. It has been cut and polished professionally. Comes with information, stand, and authenticity, Jensan Scientifics LLC.
Size: 1" diameter
only 2 available