Overview
| Stage | Construction |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Cut & Fill
- Sub-level stoping
- Shrinkage stoping
- Transverse stoping
- Longitudinal stoping
- Cemented backfill
|
| Production Start | ...  |
| Mine Life | 12 years (as of Jan 1, 2021) |
Endeavour Silver Corp. is pleased to provide a construction update for its Terronera Project. Early works have continued since the first quarter of 2022. Overall construction progress is 30% complete.
The Company remains focused on advancing the Terronera Project to initial production. Upcoming major milestones include:
• Awarding the mill construction contract to begin mobilization for Q4 2023 construction.
• Receiving major mill component deliveries in Q3 including the SAG mill, hydrocyclone separator, thickener components and apron feeders.
• Advancing development for Portal 1 decline.
• Advancing Portal 2 and Portal 4 development for initial ore access in Q1 2024. |
| Latest News | Endeavour Silver Provides Q3 Construction Update on the Terronera Project; Construction Progress is Nearing 40% October 26, 2023 |
Source:
p. 72
Endeavour Silver holds the Terronera Project through its 100% owned Mexican subsidiary, Endeavour Gold Corporation S.A. de C.V. (Endeavour Gold). Endeavour Gold holds the Terronera Project through its 100% owned subsidiaries Terronera Precious Metals S.A. de C.V. (TPM) and Minera Plata Adelante S.A. de C.V. (MPA).
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
- Breccia pipe / Stockwork
Summary:
The deposits within the San Sebastián del Oeste district are considered to be examples of lowsulphidation epithermal deposits.
The San Sebastián del Oeste area, including the Terronera Project, is underlain by an intermediate to felsic volcanic and volcaniclastic sequence correlated with the middle to lower Cretaceous Lower Volcanic Group of the Sierra Madre Occidental geological province. This volcano-sedimentary sequence consists of shale, sandstone, and narrow calcareous-clayey interbeds overlain by tuffs, volcanic breccias, and lava flows of mainly andesitic composition. The volcano-sedimentary units crop out in the north-central part of the district. Further to the north, granitic to granodioritic intrusive rocks are present.
In the San Sebastián del Oeste district, silver and gold mineralization represents the upper portion of an epithermal vein system. Illite, sericite, and adularia are characteristic alteration assemblages that typically occur in the veins and in the vein wall rocks. In higher elevation
areas, where limited mining (colonial-era artisanal mining), has occurred, such as the El Hundido and Real de Oxtotipan mines, the quartz is amorphous and milky white, indicative of a low-temperature environment.
The epithermal veins' silver-gold ± base metal mineralization is hosted in structurally controlled quartz and quartz breccia veins. The principal Terronera Vein has been traced by drilling for 1.5 km on strike and from the surface to the maximum depth of dr ........
Mining Methods
- Cut & Fill
- Sub-level stoping
- Shrinkage stoping
- Transverse stoping
- Longitudinal stoping
- Cemented backfill
Summary:
The Terronera mine will be accessed via three declines developed from the surface. An internal decline will be used to access the La Luz deposit. The declines are designed at approximately 15% grade and will be developed as single face headings.
The declines will collar on separate portals located at the process plant, the mine dry, and a temporary access portal at the upper level of the Terronera deposit. The dual decline will incorporate re-muck/sump and re-muck/electrical substation cut-outs on a nominal 159 m spacing. Passing bays are not included in the ramp design as the design supports using a dedicated decline for material transport to the surface, reducing the potential traffic interferences from routine operations.
Three main ventilation raises will exhaust air from the Terronera deposit, and another provide ventilation to the La Luz deposit. All raises will be bored from a surface installation to the full depth of the deposits connecting to the footwall haulage drifts and developed in phases to meet development and production requirements.
An internal ramp will be developed from 1560 elevation to 1120 elevation. This ramp will be a single face heading to provide mobile equipment access throughout the mine when completed. Mine sub-levels will be spaced at a nominal 20 m interval to support SLS and CAF mining.
Alimak raises will be developed to support the movement of waste and ore. Material movement during the decline deve ........
Source:
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Flow Sheet:
Summary:
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Reserves at June 30, 2021:
Mineral Resources are constrained within a wireframe constructed at a nominal 150 g/t AuEq cut-off grade.
Mineral reserves are reported using a silver equivalency cut-off formula AgEq (g/t) = Ag (g/t) + (Au (g/t) x 78.9474). Cut-off grade varies between 156 g/t to 200 g/t AgEq depending on mining method.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
7,380 kt
|
Silver
|
197 g/t
|
46,707 koz
|
|
Probable
|
7,380 kt
|
Gold
|
2.25 g/t
|
534 koz
|
|
Probable
|
7,380 kt
|
Silver Equivalent
|
374 g/t
|
88,834 koz
|
|
Indicated
|
5,303 kt
|
Silver
|
255 g/t
|
43,452 koz
|
|
Indicated
|
5,303 kt
|
Gold
|
2.75 g/t
|
469 koz
|
|
Indicated
|
5,303 kt
|
Silver Equivalent
|
460 g/t
|
2,608 koz
|
|
Inferred
|
1,058 kt
|
Silver
|
212 g/t
|
7,214 koz
|
|
Inferred
|
1,058 kt
|
Gold
|
2.5 g/t
|
85 koz
|
|
Inferred
|
1,058 kt
|
Silver Equivalent
|
399 g/t
|
13,601 koz
|
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