KALIAPANI, India--In the dusty mountains of eastern India, workers at the country's largest chromium deposit have mined for the essential ore, rain or shine, for around 60 years.... The industry is fruitful in some ways — hundreds of trucks stacked with mineral-rich soil journey back and forth regularly between the mine and processing plants — but it is damaging in others.... A layer of chromium makes solar panels more efficient, and the mineral is also used in wind turbines and batteries....