During the early days of the excavations, forensic anthropologists brought in heavy equipment, including two 50-foot (15 m) flat conveyor belts and soil sifters to find traces of remains.
Now an armed gang of treasure hunters equipped with bulldozers has supplanted archaeologists' painstaking efforts with trowels, brushes and soil sifters.
Then via a series of devices such as magnets and wind sifters, the ferrous waste, aluminium, recyclable polymers and card are respectively removed for recycling.
Invention of locally useful machines such as yam pounding machine, cowpea sheller, palm oil digester and mechanical cassava pulveriser/sifter and fryer.
