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References
- ↑ "Third largest tin producer worldwide". moodys.com. 2014. Retrieved 2015-03-08.
- ↑ "Concentration plant". Digiscend.com. 2014. Retrieved 2015-03-08.
- ↑ "EIA second amendment". Digiscend.com. 2014. Retrieved 2015-03-08.
- ↑ "EIA second amendment approved" (PDF). minem.gob.pe. 2014. Retrieved 2015-03-08.