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The brothers took different paths for the first time in October 1912 with Stjepan heading toward the United States to initiate new business contracts, while Mirko was supposed to continue their research, starting the new expedition. Because his group did not meet another group of explorers to continue with, Mirko decided to proceed deeper into the rainforest around Huayabamba river, on his own, not to be seen again. In the aftermath, numerous theories about his disappearance arose, including murder, loss, even cannibalism, but none was ever proven. After his older brother's disappearance, Stjepan kept moving, searching for mineral deposits in south and Central America until, in 1917, he decided to settle and made his home in Ouro Preto, Brazil, where he died in 1936.
Read more about this topic: Mirko And Stjepan Seljan