Mineralization is hosted in two veins with a general strike of N60W, dipping between 45 to 60 degrees southwest. The host rock of the veins is comprised of the Zacatecas formation, a mid to late Triassic turbidite sequence, consisting of beds of dark grey, green and grayish-green shale, sandstone, conglomerate and siltstone. The veins extend over a length of 2.5 to 3.0 kilometers, and to a depth of at least 150 to 200 meters, as determined from available drilling data (Rodriguez et al., 1987). Each of the Rosario I and Rosario II veins vary in width from 0.4 to 2.5 meters. Mineralization appears to have occurred in three stages, with the third stage precipitating the silver bearing minerals. This deposit has been described as a mesothermal vein system based on temperature (195 to 338°C), although mineralization is typical of other deposits in Mexico which are described as epithermal. Abundant sulfides, sphalerite pyrite and galena with subordinate amounts of chalcopyrite, arsenopyrite and hematite, can be found within the veins. Additional minerals identified through electron microscopy include freibergite, tetrahedrite, boulangerite, pyrargyrite, argentite, stromeyerite, and diaphorite (Rodriguez et al., 1987).

The Rosario Veins at the Rosario Project are vein filled faults defined as mesothermal within epithermal limits.

Based on fluid inclusion work in quartz and calcite, Palacios and Arriaga (1994) postulated that the mineralization in the Rosario veins occurred in three stages, the most important of which was the latest stage in which argentiferous minerals were deposited. The temperatures during deposit formation were determined using fluid inclusions in quartz and calcite. The third stage occurred within epithermal temperature ranges between 195 to 262 degrees Celsius with salinity of 12% to 16%. Palacios and Arriaga state that fluid inclusion temperatures indicate that this is a mesothermal type deposit based on temperatures defined by Lindgren (1933) although based on the presence of adularia and silver sulfosalts, the Rosario veins more closely resemble an epithermal deposit.

The Rosario Project currently includes the Rosario Mine and the Membrillo Prospect [2019 MDA, p. 12]. The Company suspended operations at the Cinco Estrellas property in late 2017. [2018 MDA, p. 10]

At the Membrillo Prospect the Company completed access to Levels 1, 2 and 3 on the main Membrillo vein as well as on the San Rafael vein. [2018 MDA, p. 11]

Current primary source of mill feed is the Membrillo Prospect, a mesothermal, low sulphidation polymetallic vein system of Ag, Au, Zn and Pb that carries to surface.

Management remains focussed on increasing tonnes of mineralized material processed at the milling facility with the objective of reaching 400 tpd before the end of Q3 2020 with improved head grades. Additional mining equipment (two sccoptrams) was procured for the project in the second quarter of 2020 which should result in an increase of production towards the target amount. [03/31/2020 MDA-Q1, p.11]

The proposed plant will process up to 500 tonnes/day of material to produce two concentrates, a lead concentrate and a zinc concentrate. [2015 AIF, p. 51]

Production at the Rosario Project, all from the Membrillo Prospect, improved on a year-over-year basis with the silver head grade increasing by 51%, tonnes milled increasing by 24% and silver equivalent ounce production increasing by 53%

Management remains focussed on increasing tonnes of mineralized material processed at the milling facility with the objective of reaching 400 tpd before the end of Q3 2020 with improved head grades.