"Frenzied Finance," pro and con, of late has so filled the air that to many the question arises: Does mining really exist? With all her disadvantages, Butte still demonstrates mining as a reality. With her annual production of 250,000,000 pounds of copper, not to mention her silver and gold, her many miles of underground tunnels extending nearly half a mile below the surface, and her thousands of miners using tons of powder daily, Butte offers for our study a subject worthy of consideration.
In no department of human industry has more rapid progress been made of late years than in explosives. The ablest chemists and the best engineers have found in the study of explosives a fruitful field, and the results of their labors are to be seen in the perfected explosives of to-day—explosives which are marvels of chemical perfection; which are so modified and varied in
DONOVAN JA. BLASTING EYE INJURIES.. JAMA. 1905;XLV(6):387-389. doi:10.1001/jama.1905.52510060023002d