The Media Luna deposit is located on the south side of the Balsas River, ~7 km south south-west of the ELG Mine Complex.

Systematic drilling has identified a gold-copper-silver mineralized skarn with approximate dimensions of 1.4 km x 1.2 km and ranging from 4 m to greater than 70 m in thickness. The mineralization occurs in most parts around 500 m below surface but crops out at surface at the north side of the Media Luna ridge. Skarn alteration and associated mineralization is open on the east, southeast, southwest, and northwest margins of the area.

The surface geology of the Media Luna area is dominated by Morelos Formation limestone, which is intruded by numerous porphyry dykes and sills. The contact between the Morelos Formation and the El Limón granodiorite stock is exposed in the northern sector of the area, and Mezcala Formation sediments are present in the southern portion of the area. Morelos Formation limestone is typically converted to grey to white marble along with the intrusive contacts, often accompanied by clay and iron-oxide. The Mezcala Formation is locally converted to biotite–hornfels where cut by dykes and sills. The mineralization hosting skarn occurs at the contact of the El Limón granodiorite with the Morelos limestone. The skarn, like the wall rocks, is intruded by numerous porphyritic dykes and sills.

Media Luna is a magnesian skarn and has formed where rocks are more dolomitic, whereas ELG is a calcic skarn. Refle ........

The ML Mineral Reserve is divided into two relatively distinct zones; MLL and MLU. The mine design uses primarily LHS with paste backfill and some MCAF stoping. The mine design provides operational flexibility for planning and scheduling while targeting high grade material early in the production life. The mine design divides the mine into blocks which can operate as independent areas but share a main access and materials handling system to transport mineralized material under the Rio Balsas to the ELG Process Plant.

Media Luna will be accessed via three portals and tunnels: Guajes portal and tunnel on the north side of the Rio Balsas at the ELG Mine Complex and South Portal Upper (SPU) and South Portal Lower (SPL) portals and tunnels on the south side of the Rio Balsas near San Miguel. There are box cuts and portals constructed at each site to facilitate tunnel development and the life of mine operation. The plan to maintain the ELG Mine Complex as the main access route provides benefits from a social, environmental, security and operational perspective.

Guajes Tunnel
The Guajes Tunnel will be the main haulage route for life of mine operation and the primary access for personnel and material movement from surface to underground.

The Guajes Tunnel profile is 6.0 m wide by 6.5 m high and is approximately 6.5 km long with a maximum gradient of 13%. For the development phase, one 1,830 mm diameter and one 1,520 mm temporary ventilation d ........

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