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Mexico
Terronera Project

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 Location:
43 km NE from Puerto Vallarta, Jalisco, Mexico

  Project Contacts:
Calle Cerro Gordo del Campestre No. 201, interior #208 Colonia Las Quintas
Leon Guanajuato
Guanajuato, Mexico
37125
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WebsiteWeb
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  • Overview
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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
Mining Method
  • Cut & Fill
  • Sub-level open stoping (SLOS)
  • Shrinkage stoping
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
Production Start...
Mine Life12 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.


Owners

Source: p. 25
CompanyInterestOwnership
Endeavour Silver Corp. 100 % Indirect
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 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 ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Silver Concentrate kt 192
Silver Payable metal koz 3,30039,341
Silver Metal in concentrate koz 40,948
Gold Payable metal koz  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required
Silver Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics
Daily ore mining rate  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
* According to 2021 study.
Subscription required - 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.

CategoryTonnage CommodityGradeContained 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

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Silver USD  ......  Subscription required&nbs
Total cash costs Silver USD  ......  Subscription required *†
All-in sustaining costs (AISC) Silver USD  ......  Subscription required *†
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2021
UG mining costs ($/t milled) USD 30.6 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 188
G&A costs $M USD 80.5
Total OpEx $M USD  ......  Subscription required
Mining Taxes $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of September 9, 2021:
HME TypeSizeQuantityLeased or
Contractor
Bolter ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 9, 2021
....................... Subscription required ....................... Subscription required Subscription required Sep 9, 2021
....................... Subscription required ....................... Subscription required Subscription required Sep 9, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Pre-Feasibility Study Report 2018
Press Release 2018
Pre-Feasibility Study Report 2017
Press Release 2017
Year-end Mineral Reserves 2017
Preliminary Economic Assessment 2015
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