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Emerald mines of the Kafubu area

Kafubu area

The Kafubu area near Kitwe in the Copperbelt hosts a large number of emerald occurrences in Proterozoic metasediments and ultramafic rocks cut by pegmatites. The intrusion beryllium-rich pegmatite fluids reacting with Chromium-bearing rocks lead to the formation of emerald.

Kagem mine: 
Kagem is probably the world's largest coloured gemstone mine. It is owned to 75% by Gemfields, a British gemstone mining and trading company and to 25% by the Zambian state. The open pit stretches over almost 1km and is over 100m deep. The mine is fully mechanised with large excavators and dump trucks operating, but mining of the productive contact zones around the pegmatites, where the best emeralds occur, is still done by hand only. We had the opportunity to visit the mine in 2010.

 

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Kagem mine, September 2010


Kagem mine:The Kafubu area near Kagem mine

 


Kagem mine: One of the mine gates

 
Kagem mine: Large pegmatites cut through the rock sequence (Cr-bearing schist)

 


Kagem mine: The soil profile is deeply weathered. Even the resistant pegmatites are completely weathered away near the surface

 


Kagem mine: Mechanised mining

 


Kagem mine: Mechanised mining

 


Kagem mine: Mechanised mining

 


Kagem mine:  Mining the productive zone is done by hand and is closely watched all the time

 


Kagem mine: Piece of low-grade emerald

 


Kagem mine: Piece of contact zone with quartz and black tourmaline

 

 


Kagem mine: Because the pit wall is already more than 100m high, it becomes uneconomical to remove the overburden when mining deeper into the pit. Therefore, a trial shaft was built to check for the possibilities of underground mining.

 


Kagem mine: Trial mining underground

 


Kagem mine: Trial mining underground

 


Kagem mine: Contact zone between pegmatite (pinkish white; left) and the Schist (dark grey; right). The contact zone contains quartz, black tourmaline, biotite and emerald.

 


Kagem mine: Very small emerald in the contact zone

 


Kagem mine: Treasure chest

 


Kagem mine: The material brought by the dump trucks is crushed...

 


Kagem mine: ... washed...

 


Kagem mine: ... and split up in different size fractions

 


Kagem mine: Very large emeralds are found here

 


Kagem mine: The smaller fractions are being sorted on several conveyor belts

 


Kagem mine: The workers (blue overalls) pick the emerald from the belts - always under the watchful eyes of the guards in green

 


Kagem mine: Even the smalles piece is found here

 


Kagem mine: First flush

 


Kagem mine: Emerald rough at Kagem

 


Kagem mine: Nice specimen

 


Kagem mine: Nice specimen

 


Kagem mine: Emerald rough awaiting sorting at Kagem

 


Kagem mine: Emerald rough at Kagem

 
Kagem mine: Sorting the rough at Kagem

 


Kagem mine: Abandoned emerald mine near Kagem

 


Kagem mine: Sunset over the Kagem mine facilities

 

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