Volcan iron mineralization includes magnetite rich skarn associated to the intrusion and extrusion of magmas rich in iron and formed in a volcanic environment.

Peña Colorada is a complex polyphase iron ore deposit. The iron mineralization at Peña Colorada consists of banded to massive concentrations of magnetite within breccia zones and results from several magmatic, metamorphic and hydrothermal mineralization stages with associated skarns, dykes and late faults sectioning the entire deposit.

The Las Truchas deposits consist of massive concentrations of magnetite of irregular morphology. The main Las Truchas deposits occur along about seven kilometers long and about two kilometers wide. The Las Truchas mineral deposits have been classified as hydrothermal deposits, which may have originated from injections of late stage-plutonic-activity through older sedimentary rocks. The mineralization of the Las Truchas iron deposits occurs in disseminated and irregular massive concentrations of magnetite within metamorphic rocks and skarns. The mineralization also occurs as fillings of faults, breccia zones, and fractures.

The pre-concentration facilities at Volcan include one primary crusher, one secondary crusher, a dry cobbing high intensity magnetic pulley and three tertiary crushers. The concentration plant includes two ball mills on line, a magnetic separation circuit, flotation systems, a belt conveyor filter and a disposal area for tails. The major port installations include a tippler for railroad cars, a conveyor, transfer towers and two ship loading systems.

Peña Colorada operates an open pit mine as well as a concentrating facility and a two-line pelletizing facility. The beneficiation plant is located at the mine, whereas the pelletizing plant is located in Manzanillo. Major processing facilities include a primary crusher, a dry cobbing plant, one autogenous mill, horizontal and vertical ball mills and several stages of magnetic separation. The concentrate is sent as a pulp through a pipeline from the mineral processing plant.

The concentrator includes one primary crusher, two secondary crushers and three tertiary crushers,one ball mill and one bar mill and two wet magnetic separation circuits. The electrical energy supplier for the Las Truchas mine is a state-owned company, Comisión Federal de Electricidad (CFE).