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Colombia
Quebradona Project

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 Location:
53 km SW from Medellin, Colombia

  Project Contacts:
Carrera 43 A #1 Sur - 220. Piso 9
Medellín
Colombia
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Production
  • Reserves
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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
  • Molybdenum
Mining Method
  • Sub-level caving
Mine Life23 years (as of Jan 1, 2021)
Following the decision of Colombia’s environmental agency (“ANLA”) in November 2021 to archive the Company’s environmental licence application relating to the Quebradona project, AngloGold Ashanti filed an appeal. On 29 April 2022, AngloGold Ashanti was informed that ANLA has dismissed the appeal and confirmed the decision to archive the Company’s application.

AngloGold Ashanti continues to review and analyse the further information identified as part of ANLA’s decision. The objective is to prepare, submit and process a new environmental licence request for Quebradona in due course.


Owners

Source: p. 10
CompanyInterestOwnership
AngloGold Ashanti Ltd. 100 % Indirect
Minera de Cobre Quebradona S.A.S. B.I.C. (operator) 100 % Direct
AngloGold Ashanti (Minera de Cobre Quebradona S.A.S, Beneficio de Interes Colectivo (BIC) is the owner and operator of the Quebradona project.

Contractors

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Deposit Type

  • Porphyry


Summary:

Five main targets have been identified in the exploration work, namely Nuevo Chaquiro, Aurora, Tenedor, Isabela and La Sola. Nuevo Chaquiro is the most advanced of the targets and the sole mineral deposit considered in the FS and licensing process. Nuevo Chaquiro, a significant copper-gold porphyry-style mineralised system, is one of five known porphyry centres on the property and has been the focus of exploration activities since the beginning of 2011 with more than 75km of drilling. Quebradona will be a copper mine with gold and silver as by-products.

The geology of Nuevo Chaquiro consists of a volcanoclastic sequence of Miocene age (ash, tuffs, agglomerates and andesites) intruded by small dykes of diorite and quartz diorite which are also of Miocene age. This host rocks are intruded by different pulses of mainly medium to fine-grained quartz diorites. The majority of the intrusives do not reach surface and remain as a blind deposit despite erosion acting for a significant period. These intrusive rocks are categorised as pre-mineral, early, intra-mineral and late, according to cross-cutting interrelationships, spatial occurrence and copper-gold values. The alteration develops a well zoned porphyry type system with alteration reflecting different temperatures from propylitic, sericitic, chloritic-sericitic, potassic to calcic-potassic assemblages. Higher grade copper-gold mineralisation is associated with a well-developed quartz vein stockwork in the cupola zone ........


Mining Methods

  • Sub-level caving


Summary:

The grade distribution within the Quebradona shows that there is high grade in the upper portion of the orebody and the grade reduces with depth. Sub-level caving (SLC) is a top-down mining method which makes it a sensible and robust option for the initial mining phase of the operation offering the following advantages:
• Less upfront capital compared to other caving methods;
• Ability to access high grade ore located at the top of the orebody during the early stages of the production schedule;
• Early establishment of the surface subsidence (the undercut is shallow compared to block caving methods);
• A footprint capable of production rates >5Mtpa, thus allowing a rapid payback period;
• Provides flexibility through drill and blast techniques to define the ore boundary on each production level;
• Flexibility to change the mining method to other caving methods, if required.

SLC is a common caving method and was chosen to maximise the best Mineral Resource extraction that is aligned with the TSF capacity of 119Mt.

Geotechnical modelling used 3D models for the structure, lithology and alteration and these built using the implicit modelling workflow in Leapfrog™ Geo software.

An external assessment on caveability demonstrated that the current mining geometry and dimensions is suitable for caving with the block height: block width ratio being less than 2:1, giving a high-level of confidence of cave connection to surfa ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsLOM
Copper k lbs 2,935,530
Gold koz  ......  Subscription required
Silver koz  ......  Subscription required
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual mining rate  ......  Subscription required
Annual ore mining rate  ......  Subscription required
Mining scale, tpd  ......  Subscription required
* According to 2021 study.
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Reserves at December 31, 2021:
The Ore Reserve was estimated at a cut-off value of $30/t NSR.

CategoryTonnage CommodityGradeContained Metal
Probable 120.01 Mt Copper 1.23 % 3,250 M lbs
Probable 120.01 Mt Gold 0.67 g/t 2.6 M oz
Probable 120.01 Mt Silver 7.29 g/t 28.11 M oz
Proven & Probable 120.01 Mt Copper 1.23 % 3,250 M lbs
Proven & Probable 120.01 Mt Gold 0.67 g/t 2.6 M oz
Proven & Probable 120.01 Mt Silver 7.29 g/t 28.11 M oz
Measured 86.74 Mt Copper 0.95 % 1,814 M lbs
Measured 86.74 Mt Gold 0.5 g/t 1.41 M oz
Measured 86.74 Mt Silver 5.72 g/t 15.95 M oz
Measured 86.74 Mt Molybdenum 174 ppm 33 M lbs
Indicated 227.33 Mt Copper 0.87 % 4,338 M lbs
Indicated 227.33 Mt Gold 0.46 g/t 3.34 M oz
Indicated 227.33 Mt Silver 5.59 g/t 40.87 M oz
Indicated 227.33 Mt Molybdenum 144 ppm 72 M lbs
Inferred 305.94 Mt Copper 0.48 % 3,231 M lbs
Inferred 305.94 Mt Gold 0.23 g/t 2.27 M oz
Inferred 305.94 Mt Silver 3.66 g/t 36.05 M oz
Inferred 305.94 Mt Molybdenum 135 ppm 91 M lbs
Total Resource 620.02 Mt Copper 0.69 % 9,384 M lbs
Total Resource 620.02 Mt Gold 0.35 g/t 7.02 M oz
Total Resource 620.02 Mt Silver 4.66 g/t 92.86 M oz
Total Resource 620.02 Mt Molybdenum 144 ppm 197 M lbs

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Copper USD  ......  Subscription required&nbs
Total cash costs Copper USD  ......  Subscription required *†
All-in sustaining costs (AISC) Copper USD  ......  Subscription required *†
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
† Net of By-Product.
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2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 1,914
G&A costs $M USD 403
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Pipelines
TypeMaterialDiameterLengthDescription


Proposed Heavy Mobile Equipment as of December 31, 2021:
HME TypeSizeQuantity
Drill (long hole)
....................... Subscription required
....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 12, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 12, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 12, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 12, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 12, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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