Guanacevi Mine

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Mine TypeUnderground
  • Silver
  • Gold
Mining Method
  • Longhole stoping
  • Avoca
  • Unconsolidated rockfill
Production Start... Lock
Mine Life2028
ShapshotThere are three orebodies being mined at Guanacevi: El Curso, Milache, and Santa Cruz Sur. Additionally, 20% of total ore milled is purchased from local artisanal miners.


Endeavour Silver Corp. 100 % Indirect
Endeavour Silver Corp. controls the Guanaceví Project through its 100% owned Mexican subsidiary, Endeavour Gold Corporation S.A. de C.V. (Endeavour Gold). Endeavour Gold holds the project through its two 100% owned subsidiaries, Minera Plata Adelante S.A. de C.V. (Minera Plata Adelante) and Refinadora Plata Guanaceví S.A. de C.V. (Refinadora Plata Guanaceví).



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Deposit type

  • Vein / narrow vein
  • Epithermal


Project Geology
The Santa Cruz mine property, which forms part of the main portion of the Guanaceví Mines Project, covers about a 3.0 km strike length of the Santa Cruz fault/vein system. The Santa Cruz vein is similar in many respects to other veins in the Guanaceví district, except that it is the only one to lie on the west side of the horst of Guanaceví Formation and associated facies, and it dips west instead of east.

The broader and higher-grade mineralized ore shoots tend to occur along flexures in the Santa Cruz vein structure, where sigmoidal loops are developed both along strike and down dip. The vein in Deep Santa Cruz for instance splays into two, three or four separate mineralized structures with the intervening wall rocks also often well mineralized, giving mining widths up to 20 m in some places. These sigmoidal loops tend to develop with some regularity along strike and all the ore shoots at the Santa Cruz mine have about a 60° plunge to the northwest. A shallow northwest plunging striation, raking at 15°-30°, is noted on a number of fault planes within the Santa Cruz structure; these striations appear to be consistent with an observed sinistral movement seen on minor faults which produce small offsets of the Santa Cruz vein.

Local Structure
The Santa Cruz vein, the principal host of silver and gold mineralization, is located on the west side of the horst of the Guanaceví Formation. The mineralized vein is part of a major fault system that trends northwest and principally places the Guanaceví Formation in the footwall against andesite and/or rhyolite in the hanging wall. The vein/fault presents a preferred strike of N45°W with dips from 45° to 70° to the southwest. From Santa Cruz Sur to Milache, it extends 6.5 km and averages approximately 3 m in width.

Deposit Type
The Guanaceví silver-gold district comprises classic, high-grade silver-gold, epithermal vein deposits, characterized by low sulphidation mineralization and adularia-sericite alteration. The Guanaceví veins are typical of most other epithermal silver-gold vein deposits in Mexico in that they are primarily hosted in the Tertiary Lower Volcanic series of andesite flows, pyroclastics and epiclastics, overlain by the Upper Volcanic series of rhyolite pyroclastics and ignimbrites. Evidence is accumulating in the Guanaceví mining district that the mineralization is closely associated with a pulse of silicic eruptions that either signaled the end of Lower Volcanic Sequence magmatism or the onset of Upper Volcanic Sequence activity.

Low sulphidation epithermal veins in Mexico typically have a well-defined, sub-horizontal ore horizon about 300 m to 500 m in vertical extent where the bonanza grade ore shoots have been deposited due to boiling of the hydrothermal fluids. Neither the top nor the bottom of the Santa Cruz ore horizon has yet been found but, given that high-grade mineralization occurs over a 400-m vertical extent from the top of the Garibaldi shaft (south of the Santa Cruz mine) to below Level 13 in Santa Cruz, it is likely that erosion has not removed a significant extent of the ore horizon.

The principal mineralization within the Santa Cruz-Porvenir mines is an epithermal low-sulfidation, quartzcarbonate, fracture-filling vein hosted by a fault-structure that trends approximately N45°W and dips 55° southwest. The fault and vein comprise a structural system referred to locally as the Santa Cruz vein structure or Santa Cruz vein fault. The Santa Cruz vein structure has been traced for 6.5 km along the trend and averages about 3 m in width. Mineralization in the system is not continuous but occurs in steeply northwestraking shoots up to 200 m in strike length. A second vein, sub-parallel to the Santa Cruz vein but less continuous, is economically significant in the Porvenir Dos zone, the northern portion of deep North Porvenir, in the Milache zone and finally in the Santa Crus Sur zone. It is referred to in these areas as the “Footwall vein”.

Santa Cruz Vein
The Santa Cruz vein is a silver-rich structure with lesser amounts of gold, lead and zinc. Mineralization has averaged 500 g/t silver and 1 g/t gold over 3 m true width. The minerals encountered are argentite-acanthite, limited gold, galena, sphalerite, pyrite and manganese oxides. Gangue minerals noted are barite, rhodonite, rhodochrosite, calcite, fluorite and quartz. The mineralization down to Level 6 in the Santa Cruz mine is mainly oxidized, with a transition zone of oxides to sulfides occurring between Levels 6 to 8, although some sulfide ore was mined above Level 6.

Mineralization exhibits evidence of episodic hydrothermal events which generated finely banded textures. The higher-grade mineralization in the district is commonly associated with multiple phases of banding and brecciation. The first phase, deposition of white quartz, white calcite and pyrite in stockwork structures, often exhibits horse-tail structures bifurcating both in the horizontal and vertical sense to form imbricate pods. The second phase deposited semi translucent quartz with argentite, scarce gold, and oxides of manganese (2%) and rare lead and zinc sulfide (4%), the latter particularly in the lower part of the hydrothermal system. The second phase was accompanied by the deposition of barite, rhodonite, rhodochrosite, fluorite and calcite.

This second phase comprises multiple pulses of mineralization expressed in the vein structures as bands of massive, banded or brecciated quartz. Massive and massive-to-banded quartz are commonly associated with carbonate which is predominantly manganoan calcite and calcitic rhodochrosite. Rhodonite is much less abundant than carbonates but is not uncommon.

According to results obtained through diamond drilling, the lead and zinc mineralization occurs more commonly in the vein below the water table which, in the Santa Cruz mine, is just below the 13 Level.



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Mining Methods


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Crushers and Mills


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In 2021, EDR mined a total 364,955 tonnes ore and purchased an additional 46,433 tonnes third-party ore.
Silver Metal in doré koz 0000000000000000000000001,9642,066
Gold Metal in doré koz 0000000000005.24.7
Silver Equivalent Payable metal koz 00000000000000000000
Silver Payable metal koz 00000000000000001,9622,064
Gold Payable metal koz 000000005.24.7
^ Guidance / Forecast.

Operational metrics

Daily processing rate 000000000000000000841 t
Daily processing capacity 00000000000000001,200 t
Waste 000000
Tonnes processed 000000000000000000000000307,042 t
Ore tonnes mined 000000000000
^ Guidance / Forecast.

Production Costs

Total cash costs Silver USD 000 000 000 16 / oz   17.2 / oz   14 / oz  
Total cash costs Gold USD 0000 0000 0000 1,394 / oz   1,393 / oz   1,040 / oz  
Total cash costs Silver USD 0000000 0000000 0000000 15.9 / oz   17.6 / oz   13.4 / oz  
All-in sustaining costs (AISC) Silver USD 0000000 0000000 0000000 22.9 / oz   27 / oz   22.9 / oz  
Net of By-Product.

Operating Costs

Direct operating costs ($/t milled) USD 168.04  145.64  117.38  135.14  133.78  105.13  84.9  


Capital expenditures (planned) M USD  ....  Subscribe
Sustaining costs M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 15.7   17.1  
Capital expenditures M USD  ....  Subscribe
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 39.2   43.4  
Pre-tax Income M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 27.3   -4.9  
After-tax Income M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 20.5   0.04  

Heavy Mobile Equipment


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Mine Management

Source Source
Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2023

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
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Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015

Aerial view:


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