Mining contractor Cementation has sunk the deepest mine shaft in the United States. The record setting #4 shaft at Hecla Mining’s (NYSE: HL) Lucky Friday silver-lead-zinc mine in northern Idaho and plunges 2,922 metres (9,587 ft) below the surface.
The shaft has a 5.5-metre (18-ft) diameter and should be completed with all furnishings and conveyances later this year.
The newest shaft will add 23 years of mine life to Lucky Friday, which has operated for 74 years to date.
Read the entire story at www.NorthernMiner.com/news/cementation-sinks-deepest-shaft-us