Before revision: History The use of explosives in mining goes back to the year 1627,Gary L. Buffington, The Art of Blasting on Construction and Surface Mining Sites , American Society of Safety Engineers (2000).
After revision: Rock blasting during the construction of Interstate 70, 1967History The use of explosives in mining goes back to the year 1627,Gary L. Buffington, The Art of Blasting on Construction and Surface Mining Sites , American Society of Safety Engineers (2000).