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Mexico
La Guitarra Mine

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 Location:
108 km SW from Mexico City, Mexico, Mexico

  Address:
Carretera a Valle de Bravo
Temascaltepec
Mexico, Mexico
51300
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Fax01-(716)-266-5650
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Silver
  • Gold
Mining Method
  • Overhand Cut & Fill
  • Longhole stoping
  • Dry waste backfill
Production Start...
The La Guitarra Mine is a high-grade underground mine that was operated up to August 2018, currently is on care and maintenance and available for a prompt restart.


Owners

Source: p. 1
CompanyInterestOwnership
Sierra Madre Gold and Silver Ltd. 100 % Indirect
On March 30, 2023, First Majestic Silver Corp. closed its previously announced transaction to sell its 100% owned past producing La Guitarra Silver Mine to Sierra Madre Gold & Silver Ltd.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal


Summary:

Vein deposits at La Guitarra have physiochemical and mineralogical characteristics of the Intermediate Sulphidation epithermal type and fit thevein deposit model proposed by Buchanan(1981). Epithermal deposits form atshallow depths in volcanic-hydrothermal and geothermal environments. They define a spectrum with two end members, low and high sulfidation (Hedenquist et al., 1998). Intermediate Sulphidation epithermal deposits form part of the epithermal spectrum and their genesis is complex due to the involvement of fluids with meteoric or magmatic origin during their formation and to the fluid evolution.

There are in excess of one hundred epithermal veins within the property in five main vein systems: Comales–Nazareno, Coloso (Jessica and Joya Larga veins), La Guitarra (NW, Central and SE zones), Mina de Agua and El Rincón. The vein systems at La Guitarra property form a belt with an approximate width of 4 km that strikes NW – SE in excess of 15 km. Individual veins pinch and swell and vary in width from tens of centimetres to more than twenty metres. Economic zones, widths usually between 1 and 4 metres, are embedded in quartz (vein structure) having widths up to 20 metres (e.g. Guitarra vein). The ore shoots or economic zones can either be localized in the hanging wall or the foot wall of the vein structure.

Gangue mineralogy consists of banded quartz, amethyst quartz, colloform chalcedony, finegrained crystalline quartz, calcite, fluorite, pyrite, mar ........


Mining Methods

  • Overhand Cut & Fill
  • Longhole stoping
  • Dry waste backfill


Summary:

The La Guitarra Silver Mine comprises two operating mines, La Guitarra and Coloso, and three past producing areas, the Nazareno, Mina de Agua and El Rincón, which are now considered as exploration areas.

Given the narrow vein conditions, mining in La Guitarra Silver Mine is undertaken using primarily the conventional overhand cut-and-fill mining method, with limited application of longhole stoping in areas where the vein is found with thickness of 3 or more metres in width.

The cut-and-fill stoping cycle is started with blast holes drilled using hand held jackleg drills followed by blasting using conventional mining explosives. After blasting, LHD’s are used to muck the blasted ore. The cut and fill stopes are generally 100 m in length along strike and extend between levels which are typically spaced 15 to 30 m apart vertically. Each cut is 2.5 to 3.0 m in height. Depending on ground conditions, the blast holes are drilled either upward or horizontally. Waste and mineralized material below cut-off grade is blasted down and used as backfill as needed.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits20182017201620152014
Silver Payable metal oz 340,973581,120875,967895,684620,393
Silver Metal in concentrate oz 358,919611,705923,597945,662636,301
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Operational Metrics:

Metrics202220212020201920182017
Daily milling capacity  ......  Subscription required  ......  Subscription required500 t500 t500 t
Daily milling rate  ......  Subscription required  ......  Subscription required385 t365 t
Tonnes milled  ......  Subscription required  ......  Subscription required80,435 t127,842 t
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Reserves at December 31, 2021:

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured Sulphide 57 kt Silver 217 g/t 390 koz
Measured Sulphide 57 kt Gold 1.55 g/t 2.8 koz
Measured Sulphide 57 kt Silver Equivalent 347 g/t 630 koz
Indicated Sulphide 644 kt Silver 228 g/t 4,740 koz
Indicated Sulphide 644 kt Gold 1.19 g/t 24.6 koz
Indicated Sulphide 644 kt Silver Equivalent 328 g/t 6,810 koz
Measured & Indicated Sulphide 701 kt Silver 227 g/t 5,130 koz
Measured & Indicated Sulphide 701 kt Gold 1.22 g/t 27.4 koz
Measured & Indicated Sulphide 701 kt Silver Equivalent 330 g/t 7,450 koz
Inferred Sulphide 1,044 kt Silver 240 g/t 8,040 koz
Inferred Sulphide 1,044 kt Gold 0.71 g/t 23.7 koz
Inferred Sulphide 1,044 kt Silver Equivalent 299 g/t 10,020 koz

Commodity Production Costs:

CommodityUnits201820172016
Credits (by-product) Silver USD -11.06 / oz   -10.92 / oz  
Cash costs Silver USD 19.9 / oz   13.8 / oz  
Total cash costs Silver USD 22.4 / oz   22.6 / oz   18.2 / oz  
Total cash costs Silver USD 9.79 / oz†   11.5 / oz†   7.23 / oz†  
All-in sustaining costs (AISC) Silver USD 16.1 / oz†   19 / oz†   13.3 / oz†  
† Net of By-Product.

Operating Costs:

Units2018201720162015
UG mining costs ($/t milled) USD 34.7  34.8  20  
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Financials:

Units201820172016
Sustaining costs M USD 2.1   4.2  
Capital expenditures M USD 5.3   9.8   9  
Revenue M USD 9.3   15.4   21.6  
Operating Income M USD -3.3   -3.3   3.3  


Water Supply
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Heavy Mobile Equipment as of March 15, 2015:
HME TypeModelSizeQuantity
Compactor ....................... Subscription required
Compactor ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required 2 t ....................... Subscription required
Excavator ....................... Subscription required 1.5 t ....................... Subscription required
Jumbo ....................... Subscription required 14 ft ....................... Subscription required
Jumbo ....................... Subscription required 16 ft ....................... Subscription required
Loader (FEL) ....................... Subscription required 3 cu. yd ....................... Subscription required
Scoop Tram ....................... Subscription required 3.5 cu. yd ....................... Subscription required
Scoop Tram ....................... Subscription required 2 cu. yd ....................... Subscription required
Scoop Tram ....................... Subscription required 3.5 cu. yd ....................... Subscription required
Scoop Tram ....................... Subscription required 1.7 cu. yd ....................... Subscription required
Telescopic Handler ....................... Subscription required
Truck (underground) ....................... Subscription required 10 t ....................... Subscription required
Truck (underground) ....................... Subscription required 15 t ....................... Subscription required
Truck (underground) ....................... Subscription required 15 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 6, 2023
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Staff:

EmployeesContractorsYear
Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Press Release 2023
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Corporate Presentation 2018
Press Release 2018
Corporate Presentation 2017
Form 40-F 2017
Annual Report 2016
Financial Review 2016
Form 40-F 2016
Form 40-F 2015
Technical Report 2015
Subscription required - Subscription is required.

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