Minaurum Silver Inc. (TSXV: MGG) (OTCQX: MMRGF) has announced significant progress in underground rehabilitation at its historic Promontorio mine within the Alamos Silver Project in Sonora, Mexico. The company reports safe access to more than 600 metres of the main haulage level and a 55-metre-deep internal shaft, with preliminary channel sampling returning silver-equivalent grades as high as 4,142 g/t AgEq. The results support ongoing exploration at a project hosting an inaugural inferred resource of 55.2 Moz AgEq, with Promontorio alone accounting for 28.6 Moz AgEq. Investors may be watching closely as underground mapping and sampling activities expand across the project.

Key Points

  • Minaurum Silver Inc. (TSXV: MGG) (OTCQX: MMRGF)
  • Underground rehabilitation at Promontorio mine has enabled access to over 600 m of the haulage level and the 55 m-deep Balvanera shaft, with channel sampling returning up to 4,142 g/t AgEq over 0.30 m
  • Promontorio Vein Zone hosts a 28.6 Moz AgEq inferred resource within the project's total inaugural inferred resource estimate of 55.2 Moz AgEq
  • Investors should watch for progress in rehabilitation of the Quintera, Minas Nuevas, Cotera, and Pulpito vein zones, as disclosed in the announcement

Balvanera Shaft Access Unlocks Promontorio Underground Exploration

Rehabilitation crews have secured access and installed lighting across the first 600 metres of the Promontorio mine's haulage level and have installed pumps in both the Tirito and Balvanera shafts. In the 55-metre-deep Balvanera shaft, a marine ladder was installed to 45 metres with two rest stations and a bridge leading to an open lower level at 20 metres. LIDAR scanning has been completed across accessible areas, producing detailed underground imagery that is now integrated into the project's topographical and geological model, according to the announcement.

Channel Sampling Returns High-Grade Silver-Equivalent Results at Promontorio Vein Zone

Underground channel sampling conducted along mineralised structures at historically mined stopes returned standout results including 0.30 m of 4,142 g/t AgEq (3,860 g/t Ag, 0.42 g/t Au, 1.91% Cu, 1.58% Pb, 2.21% Zn) and 0.50 m of 733 g/t AgEq (282 g/t Ag, 2.67 g/t Au). The release states that geologists completed a 1:250-scale geological map of the haulage level from the entrance to the Balvanera shaft. A northwest-southeast fault zone, measuring one to five metres wide, was identified as a structural feature separating the Promontorio and Promontorio Sur zones near the Tirito shaft area.

Promontorio's Historical Production Context and Resource Scale

The Promontorio mine historically produced an estimated 70 million ounces of silver, with surface and underground workings traced for more than one kilometre. The Promontorio Vein Zone contributes 28.6 Moz AgEq to Minaurum's total inaugural inferred resource estimate of 55.2 Moz AgEq (34.8 Moz Ag, 35.6 Koz Au, 50.99 Mlbs Cu, 114.77 Mlbs Pb, and 237.80 Mlbs Zn) from the Europa, Promontorio, and Travesia vein zones. Historical mapping indicates the haulage level extends approximately 1,200 metres, with multiple crosscuts, shafts, and raises connecting to stopes across several levels.