The full text of a status report on the mine from 1915 speaks of hardships, mostly getting good ventilation, a long hard effort to raise a vertical shaft that would
create a natural chimney effect that would draw fresh air from the portals at 8500' and exhaust through that shaft at 11,000'. The method included tunneling
overhead for hundreds of feet until at over 800' up, insufficient air forced them to stop. The decision to drill down from the top through the rest of the way came next, and was short lived when the drill became unretrievably stuck. Decades had passed and these guys were still trying but they had run out of patience and
money. Double Click on the PDF button to read more. The file is old but it is clean of malware. Enjoy!