One, two, three cast bronze Charcé Ellier St. last weekend. Under the authority of Burkina Faso Baba and Pepito. Overview and attempted explanation. 
First the fire, heat. The home is buried, it is not the furnace or the crucible that receives the molten alloy. A fan stirs the fire to reach 1200, 1300 degrees. 
The alloy is composed mainly of copper, a little tin and zinc.
Coal is down on the sides but also on to get the desired heat. Slag and other wastes are then easily removed from the alloy for lighter, they float. 
During that time, the molds that will receive the molten alloy are cooked over a wood fire. The artists were first shaped their works in wax and then it is covered with a first layer of earth who married closest wax. Then there is a second and third layer of reinforced earth iron to keep everything.
household is a hole at the top for pouring the bronze. But before cooking, it was necessary to melt the wax to obtain a hollow mold.
Groups work together. We see Baba helped pour the bronze of an assistant who takes away the dross. Two other assistants have the molds made by Pepito. 
They must be standing and rights and very hot to not subjected to thermal shock and burst when they receive the molten alloy. 
After the night began stripping operations, the first hammer to remove the biggest.
Then using small peaks for it removes the clay stuck to the metal. 
Then comes the stage of sanding and polishing.
Some works. 
This pendant was obtained using another technique since the mold was a bone dry which was divided in half, then dug before being assembled.
Finally I suggest you visit the website of photographer Jean François Rabillon
http://www.rabillon.com/actu.htm
The photos are superb.
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