Skip to main content
Pique Salvador hoisting headframe and blue structures under a clear sky

What we do

Mining Model

64,475.9 TMS · 94.06 % · 92 % certified gold

We process ore through five integrated stages, combining mechanized narrow-vein underground mining (71.26%) with formal, traceable sourcing (28.74%) and in-house processing at 94.06% recovery.

Drilling rig and SOTRAMI workers on the surface

Stage 01 / 05

Geological Exploration, Narrow-Vein Underground Mining, Pique Salvador Hoisting & Formal Sourcing

71.26 % / 28.74 %

Own underground ore vs. traceable formalized supply

Mechanized extraction in the Santa Filomena and Santa Rosa narrow gold veins (2,450 m a.s.l.) via Trackless fleet and the Pique Salvador vertical shaft (550 m, 500 HP), complemented by traceable ore from formalized producers holding active REINFO, IGAFOM, and SUNAT RUC.

Technical details
  • Proven + Probable Reserves (2023): 142,636 DMT at 0.446 oz/st (70,075 oz Au contained) and 10,734.2 m of diamond drilling.
  • Own underground output (2023): 51,055.8 WMT (Zona 23: 54.59% and Santa Rosa: 16.67%) using Muki FF front jumbos and Schopf SFL 35 scooptrams.
  • Underground connectivity & 3D precision: 5 km fiber-optic backbone, Leaky Feeder radio, and Terrex 200 Scan Geovita mobile 3D laser scanner.
  • Third-party ore due diligence (28.74%: Partner societies 14.55%, Sourcing 8.08%, Royalties 6.11%): valid REINFO, IGAFOM, and zero child labor.
Memoria-Sotrami-2023.pdf, p. 30, 34–48, 50, 81–83, 87
Crushing and grinding area: ball mill and conveyor belts on blue structures with yellow railings (illustrative image) Illustrative image

Stage 02 / 05

Metallurgical Quality Control, Crushing & Wet Grinding at Santa Filomena II Plant

11,113

Geological and metallurgical samples analyzed (2023)

Located 10 km from the mine in the Santa Rosa ravine, every ore lot undergoes strict sampling, double-deck screening, crushing, and wet grinding fed with recirculated barren solution.

Technical details
  • Upgraded drying and pulverizing facility processing 11,113 annual samples for assay verification and metallurgical accounting.
  • Santa Filomena II Plant operating capacity of 180 t/day (64,475.9 DMT processed in 2023).
  • Controlled dosing of recirculated barren solution, sodium hydroxide (NaOH), and sodium cyanide (NaCN) under ICMI Code standards.
Memoria-Sotrami-2023.pdf, p. 30, 46, 49, 110
Agitated leaching tank battery at the Santa Filomena II Plant

Stage 03 / 05

Agitated Tank Cyanidation, Low-Grade Leach Pad & Closed-Loop Tailings Facility B

94.06 %

Metallurgical recovery across 64,475.9 DMT (19.55 g/t head grade)

High-efficiency dual hydrometallurgical circuit: agitated tank battery (including 25×26 tanks) for primary ore and a Leach Pad for low-grade oxides, operating in closed loop with lined Tailings Facility B.

Technical details
  • Primary circuit: 64,475.9 DMT processed at an average head grade of 19.55 g/t achieving 94.06% gold recovery.
  • Complementary Leach Pad: 24,350.35 DMT of oxidized low-grade ore (2.10 g/t), recovering an additional 33,038 g of fine gold.
  • Safe discharge to geomembrane-lined Tailings Facility B and return via Barren Solution Pond with continuous WAD cyanide monitoring.
Memoria-Sotrami-2023.pdf, p. 21, 30, 49, 51, 92
Desorption columns and electrowinning cells at the processing plant (illustrative image) Illustrative image

Stage 04 / 05

Pressurized Desorption Columns, Electrowinning Cell & Filter Press Recovery

Alta Pureza

Expanded desorption and selective electrowinning plant

Loaded activated carbon enters boiler-assisted desorption columns to elute pregnant solution, plating precious metals onto electrowinning cathodes followed by filter-press dewatering.

Technical details
  • Expanded boiler-assisted thermal desorption columns with controlled alcohol and sodium hydroxide dosing.
  • Clean recovery in enclosed electrowinning cells producing gold-silver precipitate cake via filter press.
Memoria-Sotrami-2023.pdf, p. 30, 110
Operator in heat-protective gear pouring molten doré into an ingot mold (illustrative image) Illustrative image

Stage 05 / 05

Smelting Furnace, Au/Ag Doré Bars & Direct Certified Export (92%)

1,283.22 kg Au

USD 81.04M in exports (92% certified ethical gold)

Final smelting into gold-silver doré bars exported directly to accredited Swiss refineries (Argor-Heraeus and Valcambi), supplying responsible fine jewelry and watchmaking across Europe.

Technical details
  • 2023 fine metal delivery: 1,283,219.84 g of fine gold (1,283.22 kg Au) and 505,180 g of fine silver (505.18 kg Ag).
  • 92% sold as internationally certified ethical gold under Fairtrade, RJC, and Swiss Better Gold Association (SBGA) standards.
  • Verified European destinations: Switzerland, the Netherlands, Germany, Poland, and Scandinavia.
Memoria-Sotrami-2023.pdf, p. 8, 9, 14, 21, 50, 78–79
SOTRAMI crew gathered underground next to the hoisting cage

Traceability & small-scale producers

Physical, legal, and ethical control from the vein to Switzerland

28.74% of the ore we process comes from formalized partner societies and small-scale producers: valid REINFO registration, IGAFOM instruments, active SUNAT tax IDs, zero child labour, and conflict-free sourcing.

Proven + probable reserves
142,636 TMS · 0.446 Oz/TCS
Estimated recoverable gold
65,871 Oz Au
Projected mine life (to Lvl 22)
+13 years
Underground 3D survey
Terrex 200 Scan Geovita