About the Minerva project:
The Minerva project is located 230km west northwest of the city of Melchor Muzquiz in Coahuila State, Mexico, 30km west of the La Encantada silver mine owned by First Majestic Silver Corp., and within 20-100km of Discovery’s other projects. Minerva encompasses Ag-Pb-Zn mineralization hosted in skarns, mantos, chimneys and breccias similar to those found at La Encantada.
The Project is located within the Sabinas Basin which serves as depositional site for an approximately 6,000m thick section of Jurassic to Cretaceous siliciclastic, carbonate, and evaporitic rocks. The Sabinas Basin is bound by the regional San Marcos and La Babia faults and contains several important deposits of various styles (e.g. CRD and Mississippi Valley (MVT) Ag-Pb-Zn; evaporite-hosted barite / fluorite / celestine; and paleo-karstic Zn-Pb).
The Project is characterized by a sequence of thick-bedded limestones with black chert nodules of the Santa Elena formation, overlying the Washita group consisting of interbedded thin clayey and sandy limestones. Intruding this sedimentary package are numerous Tertiary diorite, quartz diorite, and andesites as stocks, sills and dikes. The regional northwest trending, symmetrical anticlines and synclines that form ranges and valleys were created by the compressive Laramide Orogeny during the Eocene which was followed by a relaxation period resulting in the basin and range morphology evident today.
Discovery is carrying out the first significant modern exploration program on three main areas of historical workings, known as Mina Minerva, Concordia and Tercia. All three areas have been subject to artisanal mining, with the most extensive historical workings at Mina Minerva.
About the Mina Minerva area:
Peñoles (Industrias Peñoles S.A.B. de C.V.) built a mine and processing plant at Mina Minerva in the 1940’s and produced an unknown quantity of ore from shallow underground workings before turning its attention to La Encantada in the 1960s. The area has two abandoned shafts, one of which is 40m deep, several large mine dumps, underground workings, and the foundations of historical surface facilities.
Mina Minerva lies south along trend with Concordia and continues under alluvial cover to the south. The prospect has a 1,500m long contact of skarn / skarnoid on its east extent which extends 300m in width before plunging under alluvial cover to the north. Mineralization is mainly replacement-style hosted within recrystallized limestone, dominantly as mantos of iron oxides, siderite associated with goethite and hematite, zinc oxides and silver-rich lead sulphates and calcium carbonates. These thin bedding-parallel mineralized bodies tend to have preferred orientations as northwest and northeast trending lenses and likely represent “leakage” or “fugitive” anomalies from a larger mineralized body at depth.
About the Concordia area:
Concordia lies north of and along trend with Mina Minerva, along the western edge of the Minerva intrusive complex. Mineralized skarn along the intrusive contact strikes under alluvial cover and may be offset by a fault along its east edge. Concordia consists of an argillized diorite dyke intruded along a propylitic altered biotite monzonite contact with extensive marble-garnet skarn developed in the surrounding Santa Elena limestone formation. Mineralization is predominantly manifested within fault and fracture zones as calcite-siderite veinlets, trace galena, and iron oxidation. Entirely within the sandy limestones of the Santa Elena formation, mineralization also occurs as mantos, gossans, and stockwork. Zinc occurs primarily as oxides whereas lead and silver are mainly found in a calcite-galena stockwork. Mineralization is exposed in a zone about 1km long and 300m in width, plunging under alluvial cover to the north. East and northeast trending narrow mineralized mantos, veinlets and stockwork encountered are typical of “leakage” or “fugitive” mineralization found above carbonate replacement type deposits.
About the Tercia area:
Tercia is located at the northeastern extent of an intrusive complex, along a skarn-altered zone at the contact between diorite and biotite monzonite and host Santa Elena Formation limestones over a 2km-long section of exposed contact. Mineralization consists of stockworks of galena, sphalerite, and minor chalcopyrite in association with calcite, quartz, and limonite. Anglesite (Pb sulphate), cerrusite (Pb carbonate) and some iron-rich gossan are also present. Silver minerals include cerargyrite and native silver. The principal target is a galena stockwork zone 275m by 150m in area and hosted primarily in strongly clay altered quartz diorite. Mineralization also exists within narrow low angled brecciated faults present in the quartz diorite that contain abundant iron oxides, sporadic narrow galena veins and strong clay alteration.
Recent News Releases
August 8, 2019