This report documents the increased militarization around the Mawchi mines, as well as the different social and environmental impacts they have had on the local community...... 1. Introduction... 2. Ancestral lands and water sources to be lost from extension of Mawchi mines... 3. Tin production for export and domestic use... 4. Villagers suffer impacts of Heinda tin mine in Tenasserim... 5. Background history of Mawchi tin mine... 6. Timeline of Mawchi mines... 7. Relations between tin mining companies... 8. Military security for Mawchi mine... 9. Social impacts of tin mining: 9/1 . Health problems caused by tin mining; 9/2 . Pollution from mining waste; 9/3. Drinking water problems; 9/4. Health problems downstream from the mines; 9/5. Living conditions and safety of mine workers; 9/6 . Gender disparity... 10 . An old woman from the Mawchi area recounts her experience... 11 . Environmental impacts of tin mining: 11/1 . Deforestation; 11/2 . Landslides... 12 . Who benefits from tin mining?... 13. Conclusion and recommendations.