Eagle Mine, USA
The Eagle nickel and copper mine is located in the Upper Peninsula of Michigan, USA, in Michigamme Township, Marquette County. The property is on the watershed divide of the Yellow Dog River and Salmon Trout River.
The closest community to the mine site is Big Bay, 24 km from the property by road. Big Bay
is an unincorporated community within Powell Township, Marquette County, and has limited
services. The closest full service community is Marquette, approximately 53 km by road from
the property. Marquette provides a regional airport, rail and shipping facilities, and a
full range of commercial services.
The Humboldt mill property, a former iron ore processing facility, occupying approximately 142 hectares, is located approximately 61 km west of Marquette, Michigan. The facility is located in the township of Humboldt, Marquette County, Michigan.
Road access to the mine property is by means of paved roads from the communities of Big Bay to the east, and Marquette to the south. The Humboldt mill is located close to the main US Route 41. The route for trucking ore from the Eagle mine to the Humboldt mill is 105 km long.
The Eagle deposit is a high-grade magmatic sulphide deposit containing nickel and copper mineralization and minor amounts of cobalt, precious and platinum group metals (PGMs).
The economic minerals associated with this deposit are predominately pentlandite and chalcopyrite.
Eagle Mine Video
Three distinct types of sulphide mineralization occur at the Eagle deposit. They are described as disseminated, semi-massive and massive sulphide. Massive sulphide is generally over 90% pyrrhotite-pentlandite-chalcopyrite. Semi-massive, or matrix ore, is 30% or greater net textured sulphide. Disseminated mineralization is generally uneconomic. The semi-massive and massive sulphides occur in separate zones called the Massive Sulphide, Semi-massive East, and Semi-massive West zones.
Eagle is a relatively shallow underground mine with access gained via a surface ramp that also serves as the route for waste, ore and backfill haulage. The mine employs transverse bench-and-fill stoping with mining in an up-dip primary secondary sequence. Backfilling is undertaken using cemented and uncemented rockfill. Two ventilation shafts are in place, with the downcast shaft also equipped for emergency egress. Ore from the mine is stored in a covered coarse ore stockpile facility prior to transport by road 105 km to the Humboldt mill site.
From a second covered coarse ore storage facility, the ore is processed using a conventional crush, grind and differential flotation process to produce separate nickel and copper concentrates. Tailings from the plant are deposited sub-aqueously in the adjacent former Humboldt iron ore open pit.
Nickel and copper concentrates are stored in a covered concentrate building on site prior to being transported via rail car direct to smelter facilities within North America or to ports for shipment overseas.
Current Mineral Reserves at Eagle are sufficient for a mine life of 7 years.
Both the mine and mill operate under a number of local, state and federal permits. First commercial concentrate production was achieved in the fourth quarter of 2014.
The Qualified Persons in respect of Lundin Mining's 2015 Mineral Reserve and Mineral Resource estimates for Eagle Mine were Robert Mahin, Chief Geologist, Eagle Mine, and Colin Connors, Mine Manager, Eagle Mine.
Please see Annual Information Form
, Financial Statements
, Technical Report
and Reserves & Resources
for further information.