The real outcome of the battle at Bac was sobering. The South Vietnamese troops suffered approximately 80 killed and more than 100 wounded in a battle that might have been, but was not, a decisive one against the Viet Cong. Three American advisers were killed and eight more wounded.
"excavating Earth’s surface to reach veins of clean coal" would be the best option because this is done fairly close to the top of the Earth's surface. It's a controversial and dangerous practice.
