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Miners work illegally in the biggest tin mine in Bangka island is seen in Pemali, Indonesia on May 8, 2016. Tin is one of essential materials for manufacturing semiconductor and electronic components. Bangka island has been one of the world's principal tin-producing centers and it amounts to 30% of global tin production. For more than 300 years, tin mining has been main industry of Bangka Island, and 60% of Bangka residents are engaged in tin industry. However, for past decades, worldwide soaring demands for tin brought out countless illegal mining, and the whole island is facing serious environmental destruction and human exploitation as consequences. Recently, Indonesian government initiated regulation on tin production and distribution to protect tin industry and environment.