Mining Seminar 3rd October скачать в хорошем качестве

Mining Seminar 3rd October

Hecla's Lucky Friday mine in Mullan, Idaho, operating 2,300 meters below ground, is one of the deepest in the western hemisphere. Previously using an underhand cut-and-fill method for silver-lead-zinc extraction, the mine faced safety risks from mining-induced fault-slip seismicity. In response, Hecla introduced the Underhand Closed Bench (UCB) mining method, designed to trigger controlled seismic events through large, down-dip longhole blasts. This approach has successfully induced nearly all seismic activity during blasts, reducing overall seismic energy and eliminating damaging events. Additionally, production has increased by over 40% since implementing UCB mining.