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Chile
Tres Valles Complex

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 Location:
12 km N from Salamanca, Chile

  Address:
Parcela 25ª Lote B Chuchiñí
Salmanca
Chile
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  • Overview
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  • Mining
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  • Production
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  • Costs & Financials
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  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeOpen Pit & Underground
Commodities
  • Copper
Mining Method
  • Front caving (FC)
  • Inclined block caving (IBC)
  • Truck & Shovel / Loader
  • Sub-level caving
Production Start...
Mine Life2025
Minera Tres Valles (MTV) complex comprises two main deposits: Papomono (underground) and Don Gabriel (open pit).

There was no mining activity at the Don Gabriel open pit mine during the second quarter of 2022 and Papomono's block caving operations were put into care and maintenance in June 2022 and its contractor demobilized.


Owners

Source:
CompanyInterestOwnership
Vecchiola S.A 4.9 % Indirect
Three Valley Copper Corp. 95.1 % Indirect
On February 17, 2023, Three Valley Copper Corp. (“Company”) announced that Minera Tres Valles SpA (“MTV”), the Company’s 95.1% Chilean copper mining subsidiary, received from the Civil Courts of Santiago, the declaration of the bankruptcy liquidation. As part of this process, a liquidator has been appointed and immediately assumes full responsibility for the operations and management of MTV. The liquidator will carry out or exercise, as applicable, all acts, rights, and obligations of MTV and will be required to perform all acts necessary for the preservation of MTV’s rights against its debtors and creditors.

Contractors

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Deposit Type

  • Stratabound
  • Vein / narrow vein
  • Manto


Summary:

Minera Tres Valles mining complex (MTV) is a Cu-Ag stratabound, manto-type deposit.

The MTV Project consists of two main deposit areas about 5km apart. The Don Gabriel area hosts the Don Gabriel Manto and Don Gabriel Vein deposits. The Papomono (“PPM”) area consists of seven known deposits: Massivo, Cumbre, Mantos Connection, PPM South, Mantos North, PPM North, and Epithermal.

Papomono
The dominant sulphides in the deposit are in decreasing order: chalcocite-covelite (~85%), bornite (~6%), enargite (~5%) and chalcopyrite (~4%). It is important to mention that the bulk of the chalcocite at MTV is hypogene. Very few parts were observed with supergene chalcocite. In places where intense fracturing and faulting occurs, the action of oxidizing agents generates oxide copper minerals: chrysocolla, malachite, brochantite and atacamite. For this reason, the traditional vertical zonation of oxides on top and sulphides in deeper parts are not identified in Papomono and the main oxide zones are related to more fractured zones, sometimes deeper than preserved sulphides.

The most common deposit geometry is the manto-type (stratiform). The individual “mantos” have a thickness that ranges from 2 to 50m, up to 500m strike extension and length along dip reaching 600m. Examples of this type of deposit geometry are the PPM South, Mantos Connection, and the Mantos North deposit. The other common geometry is vein-type, with a thickness between 2 and 15m ........


Mining Methods

  • Front caving (FC)
  • Inclined block caving (IBC)
  • Truck & Shovel / Loader
  • Sub-level caving


Summary:

Overview
The open pit mine plan for the Don Gabriel Manto was developed by IMC staff in March 2018, and the underground mine plan for the Papomono Masivo inclined block cave and front cave were developed by Wood staff in July 2018. The integrated plan for the open pit and underground operations (integrated case), supporting the mine plan, was prepared by Wood staff in August 2018.

Slope Angles
The slope angle design for the Don Gabriel pit is based on two reports by E-Mining. The first is “Informe Extendido – Estimación de Parámetros de Diseño y Análisis de Estabilidad Rajo Don Gabriel” dated May 2011, and the second is an addendum dated April 2012. The two reports specified the same geotechnical design. The interramp slope angle was specified by E-Mining as 52º. The height of continuous slope could not exceed 150 m without the inclusion of an additional 20 m catch berm. This would limit the overall angle to about 50º. The E-Mining analyses looked at possible largescale slope failures (low probability) and bench scale failures. The bench scale issues, maintenance of catch berms and retention of most failures on the catch berms, were the main considerations for the interramp slope angle recommendations.

Mining Phases
The Don Gabriel phase designs are based on analysis performed by Tetra Tech and summarized in the PowerPoint presentation “Optimización y Diseño – Rajo Don Gabriel Minera Tres Valles”, dated December 22, 2017 ........


Crushing and Grinding
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Processing

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Summary:

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Production:
Supplemental ore was also contributed by third parties and ENAMI.
MTV has a tolling contract with ENAMI (a Chilean state-owned company).

CommodityUnits2022202120202019201820172016
Copper t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required5,3816,2785,412
All production numbers are expressed as cathode. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,210,321 t736,532 t
Waste  ......  Subscription required  ......  Subscription required6,195,814 t1,695,516 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required
Annual production capacity  ......  Subscription required  ......  Subscription required18,500 t of copper cathode18,500 t of copper cathode18,500 t of copper cathode
Tonnes processed  ......  Subscription required  ......  Subscription required1,433,148 t968,490 t663,851 t436,677 t
Daily processing capacity  ......  Subscription required  ......  Subscription required7,000 t7,000 t5,400 t
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Reserves at January 1, 2018:
The Mineral Resources and Mineral Reserve as at 27th May 2021 at Tres Valles mine are unchanged from july 31, 2018
Mineral Reserves are based on an open pit mine plan developed by IMC and underground mine plan and mine production schedule developed by Wood with a cutoff grade of 0.25% TCu for open pit, and 0.40% TCu and 0.47% TCu cut-off grades for the inclined block caving and front caving methods respectively.

CategoryTonnage CommodityGradeContained Metal
Proven 3,457 kt Copper 1.32 % 45.8 kt
Probable 4,778 kt Copper 0.89 % 42.4 kt
Proven & Probable 8,235 kt Copper 1.07 % 88.3 kt
Measured 5,530 kt Copper 1.42 % 172,674 k lbs
Indicated 12,774 kt Copper 0.87 % 244,581 k lbs
Measured & Indicated 18,304 kt Copper 1.03 % 417,255 k lbs
Inferred 3,457 kt Copper 1.11 % 84,408 k lbs

Commodity Production Costs:

CommodityUnits20222021202020192018
Cash costs Copper USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 2.37 / lb  
^ Guidance / Forecast.
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Financials:

Units20222021202020192018
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 6.6  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 32.7  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -1.6  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -6.6  
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Heavy Mobile Equipment:
HME TypeModelSizeQuantityStatusLeased or
Contractor
Ref. Date
Backhoe 1 cu. m ....................... Subscription required Proposed Leased May 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased May 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased May 27, 2021
Drill ....................... Subscription required ....................... Subscription required Existing May 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased May 27, 2021
Drill ....................... Subscription required ....................... Subscription required Existing May 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased May 27, 2021
Jumbo ....................... Subscription required ....................... Subscription required Existing May 27, 2021
Jumbo ....................... Subscription required ....................... Subscription required Existing Mar 29, 2018
....................... Subscription required ....................... Subscription required Proposed May 27, 2021
Scaler ....................... Subscription required ....................... Subscription required Existing May 27, 2021
Scoop Tram ....................... Subscription required ....................... Subscription required Existing May 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased May 27, 2021
Trans Mixer ....................... Subscription required ....................... Subscription required Existing May 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased May 27, 2021
Truck (underground) ....................... Subscription required ....................... Subscription required Existing May 27, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased May 27, 2021
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 30, 2022
....................... Subscription required ....................... Subscription required Subscription required May 30, 2022
....................... Subscription required ....................... Subscription required Subscription required May 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2022
....................... Subscription required ....................... Subscription required Subscription required May 30, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Technical Report 2018
Technical Report 2018
Management Discussion & Analysis 2017
Quarterly Report 2017
Other 2016
Form 20-F 2013
Other 2013
Form 20-F 2010
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