This overextended copper ingot derives from Katanga, a region on the southeastern border of the Congo Basin. Katanga is very rich in copper ore and produces diverse forms of ingots. This form is called "mukuba wa matwi," "copper with ears." It is made by the Yeke people. The Yeke moved to Katanga in the 19th century and adopted both the art of copper casting and the forms of ingots from the Sanga people, who had been living there before.