Silver-lead veins may or may not contain minor amounts of sphalerite. Silver-copper veins can also contain minor chalcopyrite, pyrite, and galena as well as trace amounts of other sulfosalts.

The Coeur Mine mineralization generally resembles that of the Galena Mine, in containing a complex vein set controlled largely by the pattern of faults, and the rheology of the Revett quartzitic and argillitic units. Mineralization at Coeur is entirely in tetrahedrite-dominated veins, with no galena-dominated veins.

The tetrahedrite of the Coeur Mine has a lower silver:copper ratio than that in the Galena Mine, about 20 ounces of silver per percent of copper.

The Coeur shaft is a three-compartment shaft, 4,100 feet deep, which is used for exhaust ventilation and when needed for hoisting of silver-lead ore from the Galena Mine and silvercopper ore from the Coeur Mine. The two mines are connected on the Coeur 3400/Galena 3700 Level.

The primary mining method at the Coeur mine is conventional cut and fill stopes.

The Coeur mine and shaft is currently on care and maintenance. The Coeur shaft is used for ventilation purposes and provides an alternative means of egress.

The Galena Complex produces a silver-lead concentrate. Material mined at the Galena Complex is milled at the Galena mill. The Galena mill has an installed milling capacity of 630 tonnes-per-day but operates below capacity. The 450 tonne-per-day capacity Coeur mill is currently on care and since April 2016.

The mill flow sheet for the Coeur mill is similar to the Galena mill.

The Galena processing plant follows a conventional flowsheet:

* Crushing and Screening.
* Grinding and Cycloning.
* Flotation Concentration.
* Concentrate Dewatering.
* Tailings Pumping for Sand Fill.
* Tailings Pumping for Osburn Tailings Storage Facility.