Twin Metals Minnesota (TMM) is focused on designing, permitting, constructing, and operating an underground copper, nickel, cobalt, platinum, palladium, gold, and silver mining project. Located approximately nine miles southeast of the city of Ely, Minnesota, and 11 miles northeast of the city of Babbitt, Minnesota, the Project targets valuable and strategic state, federal, and privat minerals within the Maturi deposit, which is a part of the Duluth Complex geologic formation. The Project consist of an underground mine, a plant site, a tailings management site, and a non-contact water diversion area along with an access road, water intake corridor, and transmission corridor.
The Project would develop an underground mine at the Maturi deposit. In the underground mine, the ore would be blasted using explosives. The blasted ore would be transported by load-haul-dump machines and haul trucks to underground crushers. The underground crushers would crush the ore to a smaller size for transportation out of the underground workings by conveyor.
Access
The underground mine would be accessed from portals located within the plant site. Two parallel declines, the conveyor decline (to the west) and the access decline (to the east), would be excavated to provide access to the subsurface orebody and underground workings. Each decline would be approximately 20 ft wide by 20 ft in height (6m by 6m). To limit the distance of overland conveying from the portals, the ........