Overview
Stage | Construction |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Cut & Fill
- Sub-level open stoping (SLOS)
- Shrinkage stoping
- Transverse stoping
- Longitudinal stoping
- Cemented backfill
|
Production Start | ...  |
Mine Life | 12 years (as of Jan 1, 2021) |
Terronera represents Endeavour’s next core asset – future flagship mine, located in San Sebastian del Oeste, a historic silver mining district in Jalisco State, Mexico. |
Source:
p. 25
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
- Subscription is required.
Deposit Type
- Epithermal
- Vein / narrow vein
- Breccia pipe / Stockwork
Summary:
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 drilling at 546 m. The Terronera Vein strikes at approximately 145° and dips 80° east. The actual width o ........

Mining Methods
- Cut & Fill
- Sub-level open stoping (SLOS)
- 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.
Approximately 59% of the Terronera deposit will be mined using transverse and longitudinal SLS.
Transverse SLS is a high productivity and lower-cost mining method compared with CAF or drift-and-fill methods. The stope dimensions will be a maximum of 20 m high x 15 m wide x 15 m long and a minimum mining width of 8 m. The stopes will be mined in a bottom-up sequence and in a primary then secondary sequence laterally. Primary stopes will be backfilled with cemented rockfill. Secondary stopes will be filled with uncemented rockfill.
In areas where the ore is less than 8 m thick across strike, longitudinal SLS will be employed. Stopes will be mined in a bottom-up sequence. After the top and bottom cuts are established, the st ........

Source:

- subscription is required.
Flow Sheet:
Summary:

- subscription is required.
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
|
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.