The new reality TV series “Bamazon,” on the History Channel, along with already established shows like “Gold Rush” and “Jungle Gold,” have elevated the global mining bonanza into living-room entertainment. Each focuses on a different group of Americans seeking their fortune in distant, ostensibly dangerous locales: “Bamazon” in Guyana, “Gold Rush” in Alaska and Guyana, and “Jungle Gold” in Ghana. But while these shows claim to depict “reality,” they gloss over the most awful truths of gold mining, particularly as it is practiced in the tropics.