As for Musa’s moolah, his “shocking wealth came from his country’s vast production of more than half the world’s supply of salt and gold,” according to the Celebrity Net Worth survey, which converted each billionaire’s fortunes into 2012 dollars.
Read more: http://www.nydailynews.com/news/world/k ... z2N6jZaWfj
Gold Mines and Salt Mines.
Mansa Musa I ruled West Africa’s Malian Empire in the early 1300s, making his fortune by exploiting
his country’s salt and gold production. Many mosques he built as a young man still stand today.http://www.independent.co.uk/news/world ... 13453.html
About seventy years before Mansa Musa took the throne, his grandfather, Sundiata, conquered the great Ghana empire in 1240 AD.
Mansa Musa sold 14,000 female slaves to pay for his haij. in1324. And up to 20,000 annually were carried away from Nigeria. ---Simon and Shulster "the Slave Trade, pages 44-45.
So slaves worked the salt and gold minds and the barracks of his soldiers (At least the female ones).
So, yes, Mansa Musa became the richest man in history due to slavery.