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Mexico
Juanicipio Mine

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 Location:
6 km SW from Fresnillo, Zacatecas, Mexico

  Regional Office:
Calzada Legaria No. 549 Torre 2 Colonia 10 de abril Delegación Miguel Hidalgo
Mexico
Mexico, Mexico
11250
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
  • Lead
  • Zinc
Mining Method
  • Longhole stoping
  • Cemented backfill
Production Start...
Mine Life2038
Underground mine production of mineralized development material commenced in Q3 2020.

The Juanicipio project team delivered the 4,000 tpd processing plant for commissioning in the fourth quarter of 2021. However, according to the operator Fresnillo and as previously reported, the state-owned electrical company (Comision Federal de Electricidad “CFE”), notified Fresnillo late in December 2021 that the regulatory approval to complete the tie-in to the national power grid could not yet be granted and that the Juanicipio plant commissioning timeline was therefore extended. As reported by the operator Fresnillo, It is expected that the plant will ramp up to 85-90% of the nameplate 4,000 tpd capacity by the end of 2022.


Owners

Source: p. 41
CompanyInterestOwnership
MAG Silver Corp. 44 % Indirect
Fresnillo plc. (operator) 56 % Indirect
MAG’s interest in the Juanicipio Project is through its 44% ownership of Minera Juanicipio, a joint venture incorporated under the laws of Mexico, which owns the high-grade silver Juanicipio Project. Fresnillo is the project operator and holds the remaining 56% of Minera Juanicipio.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal


Summary:

The Juanicipio deposit consists of two main vein systems, the Valdecañas vein system and the Juanicipio vein, which are significant silver-gold epithermal structures. The Valdecañas vein system consists of five veins (V1E, V1W, HW1, VANT, and V2W) and the Juanicipio vein (VJUA). Both systems strike eastsoutheast and dip 35° to 70° with an average dip of about 58° southwest. The Valdecañas vein system displays the metal zonation typical of the Fresnillo District and epithermal veins in general, of an upper precious metal zone (Bonanza Zone) grading downwards into a deeper base metal zone (Deep Zone). There is significant evidence for a repeat of this zonation in the deeper reaches, perhaps reflecting “stacked” boiling levels (Buchanan, 1981). The Valdecañas structure hosts the majority of the Mineral Resources currently estimated on the Property.

The Juanicipio vein is located some 1,100 m to the south of the Valdecañas vein. Thirty-five drillholes contribute to the definition of this vein. Overall, Juanicipio is a much thinner vein and appears to have a higher gold content; however, this interpretation is based on a limited number of overall samples. Mineralization styles and host rocks are the same as those for Valdecañas.

The Valdecañas vein system has undergone multiple mineralizing events as suggested by various stages of brecciation and quartz sealing, local rhythmic microcrystalline quartz-pyrargyrite-acanthite banding, and open-space cocks-comb te ........


Mining Methods

  • Longhole stoping
  • Cemented backfill


Summary:

The primary mining is longhole stoping, wich production rate of 4,000 tpd. Some cost savings and production efficiencies have been identified with the use of waste rock fill, which is now considered as the primary backfill; in the wider stopes where more than one longitudinal pass is required, cemented rock fill will be utilized.

The proposed mining method employs zone access via three internal ramps on 20 m sub-levels, as well as footwall access to the extents of the mineralization to allow placement of rock fill. Stopes 20 m high (floor to floor) are mined from the extents back to the central access (on retreat) with rock fill placed within 20 m of the blasting face.

In the lower levels of the vein, the vein widens out to a maximum thickness of approximately 30 m. In these areas, the vein will be mined in two longitudinal passes with a maximum width of 15 m. The footwall stope will be taken first over the full strike length, followed by the hangingwall stope. Cemented rock fill will be used in the footwall stope to prevent waste entering the hanging wall stope.

Truck haulage, shaft hoisting, and conveying have been considered for transferring mineralized rock and waste from the mine workings to surface. All waste not placed directly in stopes will be trucked to surface via twin access declines, where it will be stockpiled and later used for backfilling stopes as they are mined out. In early mining, mineralized rock from development and stop ........


Crushing and Grinding
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Processing

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Summary:

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Production:
During 2021, development ore from Juanicipio was processed in the Fresnillo processing plant.

CommodityProductUnits20212020Avg. Annual (Projected)LOM (Projected)
Silver Payable metal koz  ......  Subscription required  ......  Subscription required11,700183,000
Silver Metal in concentrate koz  ......  Subscription required
Gold Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required
Lead Payable metal M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required
Lead Concentrate kt  ......  Subscription required
Zinc Payable metal M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics20212020
Tonnes processed  ......  Subscription required  ......  Subscription required
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Reserves at December 31, 2021:
Ore Reserves are reported at NSR cut-off value based on metal price assumptions, metallurgical recovery assumptions, mining costs, processing costs, G&A costs, sustaining capital costs, and variable smelting and transportation costs. The all-inclusive stope operating cost for longhole stope and cut-and-fill stope is $110/tonne and $118/tonne respectively. The marginal stope cut-off value is $80/tonne.

Mineral resources NSR cut-off grades - US$80.40/t.

CategoryTonnage CommodityGradeContained Metal
Probable 16,230 kt Silver 295 g/t 153.6 M oz
Probable 16,230 kt Gold 1.53 g/t 798.2 koz
Probable 16,230 kt Lead 2.36 % 383.9 kt
Probable 16,230 kt Zinc 4.18 % 682.1 kt
Indicated 16,152 kt Silver 346 g/t 179,895 koz
Indicated 16,152 kt Gold 1.78 g/t 923.2 koz
Indicated 16,152 kt Lead 2.69 % 433.9 kt
Indicated 16,152 kt Zinc 4.78 % 773.2 kt
Inferred 14,673 kt Silver 218 g/t 102,671 koz
Inferred 14,673 kt Gold 1.21 g/t 569.6 koz
Inferred 14,673 kt Lead 2.45 % 358.9 kt
Inferred 14,673 kt Zinc 5.02 % 737.5 kt

Financials:

Units20212020
Gross profit M USD  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required
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Pipelines
TypeMaterialDiameterLengthDescription


Proposed Heavy Mobile Equipment as of January 19, 2018:
HME TypeSizeQuantity
Cable bolter ....................... Subscription required
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....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Preliminary Economic Assessment 2017
Press Release 2017
Technical Report 2014
Preliminary Economic Assessment 2012
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