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Chile
Mantos Blancos Mine

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 Location:
33 km NE from Antofagasta, Chile

  Regional Office:
Panamericana, Norte Km 1405 s/n
Antonio Bellet 292 of.706
Santiago
Chile
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2037
During the second quarter of 2022, Capstone Copper Corp. (“Capstone”) continued the ramp up of the Mantos Blancos expansion from 4.2 Mt per year to 7.3 Mt per year. The focus remains on optimization and achieving targets for sustained throughput and recoveries in Q3 2022.

On May 12th, Capstone confirmed the ongoing analysis of a potential further increase of throughput at the Mantos Blancos sulphide concentrator plant from 7.3 Mt per year to 10.0 Mt per year using the existing (currently unused/underutilized) ball mills and process equipment. A feasibility study on the Mantos Blancos Phase II Project is expected to be completed in 2022.


Owners

Source: p. 1
CompanyInterestOwnership
Capstone Copper Corp. 99.993 % Indirect
The Mantos Blancos property is owned 99.993% by Mantos Copper Holding SpA, a Chilean company.

On March 23, 2022 Capstone Mining Corp. announced the successful completion of the previously announced transaction combining Capstone Mining and Mantos Copper (Bermuda) Limited, following the receipt of all regulatory approvals and the satisfaction of all closing conditions. Concurrent with the closing of the Transaction, Mantos has been renamed Capstone Copper Corp., is headquartered in Vancouver, B.C. and represents an Americasfocused premier copper producer with transformational and peer-leading production growth.

Contractors

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Deposit Type

  • Stratabound
  • Volcanic hosted


Summary:

Mantos Blancos is a copper stratabound deposit with subordinate content of silver mineralization hosted by Jurassic volcanic sequences. Mantos Blancos has the typical rock, mineralization, alteration and structural setting of the Jurassic deposits, in spite of its bigger size in comparison with other Chilean stratabound copper deposits. The area has been the subject of geological studies and interpretation since 1917 and the deposit geology has been extensively studied by Ramirez (2006) and Maksaev (2002).

Mantos Blancos is associated with the La Negra Formation. A volcanic arc is recognized in the La Negra Formation in the Coastal Range of northern Chile. This formation comprises mainly thin flows of calc-alkaline basalts, basaltic andesites and high-K basaltic andesites, as well as some volcaniclastic intercalations with a total thickness of 7 km to 10 km. The beginning of the volcanism of the La Negra Formation has been determined to be of Lower Jurassic age. A comparable volcanic belt is also recognized in the Lower Cretaceous in several areas of northern Chile.

The deposit is mainly characterized by pyroclastic and intrusive host rock units. The pyroclastic and intrusive units are from the Permo-Triassic and Early Jurassic age. Andesite belonging to the La Negra Formation (Middle-Late Jurassic), tonalite, granodiorite, aplite and dacite porphyry belonging to the El Ancla and Alibaud plutons of Middle to Late Jurassic age also outcrop along the depos ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The open pit operation includes one large open pit (Santa Barbara) which provides most of the sulphides for the concentrator and oxides for dump leaching.

Other sources of material are:
• Flotation: Sulphide stockpile (Cancha 90);
• Dump leach process: Oxide stockpile (Mercedes Stockpile).

Variable slope angles were used for the detail mine design, with inter-ramp slope values varying between 50° and 59°. A slope angle of 36° (natural slope angle for broken materials) is used on areas with existing underground stopes and for waste dumps.

The pit design was developed considering the following:
• Minimum expansions width: 30 m for front end loaders;
• Minimum road width: 30 m;
• Maximum gradient on ramps: 10%;
• Operating bench height: 12 m (24 m in final pit walls with pre-split blasting).

The selected final pit was divided into operational phases, resulting in a total of eight phases to define the LOM 2020.

Mine movements considered historical KPIs for loaders, operational ramps and maximum quantity of equipment for each phase. The production plan was developed considering a maximum mining rate of 66 Mt per year and the operation of 4 to 5 phases simultaneously.

The resulting plan considers a total mining rate (mineral and waste) which decreases from approximately 66 Mt in 2022 to 60.0 Mt in 2025, staying at this level up to 2030 when production starts to decrease through to 2037.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits202120202019
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required
Copper Metal kt  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.


Reserves at December 31, 2020:
Mineral Resources cut-off grades:
• Dump Leach: 0.10% Cu
• Flotation: 0.22% Cu

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven & Probable Sulphide & Mixed 122,600 kt Copper 0.69 % 854 kt
Proven & Probable Oxide & Mixed 11,300 kt Copper 0.24 % 27 kt
Proven & Probable Sulphide & Mixed 122,600 kt Silver 6 g/t 22,307 koz
Measured & Indicated Sulphide & Mixed 210,900 kt Copper 0.66 % 1,400 kt
Measured & Indicated Oxide & Mixed 61,600 kt Copper 0.28 % 171 kt
Measured & Indicated Sulphide & Mixed 210,900 kt Silver 5 g/t 35,334 koz
Inferred Sulphide & Mixed 20,000 kt Copper 0.48 % 96 kt
Inferred Oxide & Mixed 18,400 kt Copper 0.21 % 38 kt
Inferred Sulphide & Mixed 20,000 kt Silver 3 g/t 2,151 koz

Financials:

Units20212020
Revenue M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment as of November 29, 2021:
HME TypeModelQuantityStatusLeased or
Contractor
Bulldozer ....................... Subscription required ....................... Subscription required Existing
Dozer (crawler) ....................... Subscription required ....................... Subscription required Existing
Dozer (crawler) ....................... Subscription required ....................... Subscription required Existing
Dozer (crawler) ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Drill ....................... Subscription required ....................... Subscription required Existing
Drill ....................... Subscription required ....................... Subscription required Existing
Excavator ....................... Subscription required ....................... Subscription required Existing
Excavator ....................... Subscription required ....................... Subscription required Existing
Grader ....................... Subscription required ....................... Subscription required Existing
Loader ....................... Subscription required ....................... Subscription required Existing
Loader ....................... Subscription required ....................... Subscription required Existing
Shovel ....................... Subscription required ....................... Subscription required Existing Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Existing
Truck (haul) ....................... Subscription required ....................... Subscription required Existing
Truck (water) ....................... Subscription required ....................... Subscription required Existing
Truck (water) ....................... Subscription required ....................... Subscription required Existing
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 3, 2022
....................... Subscription required ....................... Subscription required Subscription required May 3, 2022
....................... Subscription required ....................... Subscription required Subscription required May 3, 2022
....................... Subscription required ....................... Subscription required Subscription required May 3, 2022
....................... Subscription required ....................... Subscription required Subscription required May 3, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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