Caballo Blanco Complex

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Mine TypeUnderground
  • Silver
  • Zinc
  • Lead
Mining Method
  • Cut & Fill
  • Sub-level stoping
  • Avoca
  • Shrinkage stoping
  • Longhole stoping
Backfill type ... Lock
Production Start... Lock
SnapshotCaballo Blanco Complex consists of the Colquechaquita, Reserva and Tres Amigos mines, which supply the central Don Diego plant, water treatment plants, tailings storage facility, 2 off-site power generation facilities and support buildings.

Priorities for 2024:
– Progressing integration ramp connecting Colquechaquita to Tres Amigos to improve mining rates, ~86% complete;
– Reducing mining dilution at Reserva.
Related Asset


Santacruz Silver Mining Ltd. 100 % Indirect
On March 18, 2022, the Santacruz Silver Mining acquired 100% ownership of Sinchi Wayra and Illapa from Glencore plc. Sinchi Wayra and Illapa consist of the following mineral properties and businesses located in Bolivia: the producing Tres Amigos, Reserva, and Colquechaquita mines, collectively the “Caballo Blanco Group”; the producing Bolivar and Porco mines held in partnership with COMIBOL; the Soracaya Project; as well as the San Lucas ore sourcing and trading business.



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Deposit type

  • Epithermal
  • Vein / narrow vein


The Caballo Blanco zinc, silver, lead mine, situated south of Potosi, is located in the Jayaquila – Victoria corridor, a 5-7 km north-south structural zone with three sectors, from north to south, the Colquchaquita, Reserva, and Tres Amigos mines. They are not described in the published literature. They are hosted by volcanic rocks of the Kari-Kari volcanic complex, with dimensions of 32 km north-south and 12 km wide, located on the SE side of the Los Frailes felsic volcanic field that covers an area of 8,500 km2 at altitudes of 4,000 – 5,200 masl. The history started with intrusion of small granitoids at about 25 Ma at Kumurana, at the southern end of the Kari massif, and Azanaques. These were followed by the formation of Kari at about 20 Ma that is interpreted to be a resurgent caldera with welded ignimbrite fill. Ash flows, domes and stocks formed in the Cebadillas episode at 17-10 Ma, including the Cerro Rico dome with Ag-Sn mineralization at 13.8 Ma (Zartman & Cunningham, 1995; Cunningham et al., 1996; Rice et al., 2005).

The rocks of the Kari complex are felsic, peraluminous, and rich in garnet, cordierite and tourmaline (Schneider, 1987).

Mineralization in its generality is characterized by being housed in philonian structures divided into three domain orientations:

1. Oriented at N 10° to 20° E, are Colquechaquita (Karina, Viviana, Camila), and some veins of Tres Amigos (Catalina, Milagros Este and Central);

2. Oriented N 10° to 30° W°; Reserve veins (Rosario, Wendy, Juanita and Blanquita), in Tres Amigos there is also within this system the vein (Ramo Catalina); and

3. Corresponding to veins of the Porvenir sector where they have an N-S orientation, corresponding to Reserva (Veta Rosita) and in Tres Amigos (Milagros veins).

General mineralogy is composed of quartz-pyrite-chalcopyrite and marmatite, sphalerite, galena, boulangerite (Tres Amigos) as primary minerals; as accessory minerals we have siderite, calcite and ankerite at the trace level.

The mineralogy is quartz, pyrite, chalcopyrite, marmatite, sphalerite, galena and boulangerite with minor siderite, calcite and ankerite.



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Mining Methods


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Crushers and Mills

Milling equipment has not been reported.



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The Don Diego Process Plant also processes feed from Caballo Blanco group of mines and San Lucas toll material.
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All production numbers are expressed as metal in concentrate.

Operational metrics

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Production Costs

Commodity production costs have not been reported.


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Heavy Mobile Equipment


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Mine Management

Job TitleNamePhoneRef. Date
....................... Subscription required ....................... Subscription required ........... Subscription required Aug 10, 2023

Aerial view:


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