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Colombia
Marmato Lower Mine Expansion Project (Marmato Upper Zone)

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 Location:
85 km S from Medellín, Colombia

  Project Contacts:
Cra. 43 A # 14-57, 13th floor. San Francisco Building
Medellin
Colombia
050021
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Costs & Financials
  • Fleet
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  • Filings & News

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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Longhole open stoping
  • Cemented backfill
  • Paste backfill
Production Start...
Mine Life18 years (as of Jan 1, 2022)
The Marmato Lower Mine expansion project will include the construction of a second decline access, mine workings, 4,000 tpd CIP plant, dry stack tailings, and a project camp.

In November 2022, received approval of the Marmato Plan de Trabajos y Obras or “PTO” by the Agencia Nacional de Minería as a progressive step toward fully permitting the Marmato Lower Mine expansion project.

Construction of the project commenced in the fourth quarter of 2021.


Owners

Source: p. 1-2
CompanyInterestOwnership
Aris Mining Corp. 100 % Indirect
Marmato Project (Marmato Project) owned by Caldas Gold Marmato S.A.S. (CGM or the Company), an indirect, wholly-owned subsidiary of Aris Gold (Formerly Caldas Gold).
GCM Mining Corp. (Formerly Gran Colombia Gold Corp.) now owns approximately 44.3% of Aris Gold.

On September 26, 2022, GCM Mining Corp. and Aris Gold Corporation completed the business combination previously announced on July 25, 2022. The combined entity has been renamed Aris Mining Corporation.

At closing, GCM Mining was renamed Aris Mining Corporation and Aris Gold amalgamated with 1373945 B.C. Ltd. to form Aris Mining Holdings Corp. (Aris Holdings), which is now a wholly owned subsidiary of Aris Mining.

Contractors

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Deposit Type

  • Mesothermal
  • Vein / narrow vein
  • Epithermal
  • Porphyry


Summary:

Deposit types
Marmato is interpreted to be a porphyry hosted gold deposit with shallow epithermal and deeper mesothermal features and this interpretation has informed the exploration and mining plans.

Aris Mining the announced discovery of a deep mineralization trend, now referred to as the Lower Mine, 300 metres below the then known resources in the Upper Mine.

The Lower Mine is characterized by structurally localized veinlets of quartz, pyrrhotite, chalcopyrite, bismuth minerals, and free gold associated with illite-smectite and kaolinite alteration of the host rock. A transition zone approximately 200 m in vertical extent exists between the Upper Mine and Lower Mine mineralization, and is characterized by the extension of Upper Mine epithermal veins into the mesothermal style Lower Mine mineralization. These features indicate a reduced intrusion environment.

Mineralization
Marmato mainly comprises northwest and west-northwest trending veins and veinlets, with intermediate sulfidation epithermal and mesothermal mineralization styles transitioning with depth from the Upper to the Lower Mines. The veins outcrop at the surface, and within Aris Mining’s mining titles, mineralization extends vertically over 1,100 m and remains open at depth and along strike, and has a high expansion potential from future underground drilling programs.

The Lower Mine mineralization is characterized by mesothermal fine veinlet (less than 5 cm ........


Mining Methods

  • Longhole open stoping
  • Cemented backfill
  • Paste backfill


Summary:

The new Lower Mine porphyry style mineralization below the 950 m level will be mined using long hole stoping with paste backfill at a targeted mining rate of 4,000 tpd following a quick ramp up period. Ore will be hauled up a new decline to the new Lower Mine processing plant approximately 3 km by road from the Lower Mine.

Sill pillars are left in situ between blocks. The backfill will have sufficient strength to allow for mining adjacent to filled stopes without the need for dip pillars. The stopes will be 20 m wide and stope length will vary based on mineralization grade. A spacing of 25 m between levels has been used.

The mine will be accessed by dual decline drifts with mineralization transported from stopes via loader to an ore pass system, and then to surface by truck. For the levels below an elevation of 480 m, an ore pass system will not be used and material will be directly loaded into a truck for haulage to surface. Internal intake and exhaust raises will be developed using raise bore machines and air will flow into the mine down the dual declines and exhaust via a dedicated ventilation drift to surface. A new 4,000 tpd process facility using gravity concentration and cyanidation of the gravity tailings will be constructed to process material from the Lower Mine. In addition, two new dry stack tailings facilities will be constructed to receive approximately 57% of the total life of mine tailings from the plant. The other 43% of tailings will go ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsLOM
Gold koz 2,112
Silver koz  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily ore mining rate  ......  Subscription required
Daily processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
Annual processing capacity  ......  Subscription required
Tonnes processed  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
* According to 2022 study.
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Reserves at June 30, 2022:
Mineral resources are reported above a cut-off grade of 1.3 g/t Au.
Mineral reserves are reported above cut-off grades of 1.62 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Probable 24,135 kt Gold 2.87 g/t 2,224 koz
Probable 24,135 kt Silver 3.5 g/t 2,707 koz
Measured & Indicated 46 Mt Gold 2.54 g/t 3,761 koz
Measured & Indicated 46 Mt Silver 3.3 g/t 4,914 koz
Inferred 33.1 Mt Gold 2.39 g/t 2,537 koz
Inferred 33.1 Mt Silver 2.3 g/t 2,418 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required
Assumed price Silver USD  ......  Subscription required
Assumed price Gold USD  ......  Subscription required
* According to 2022 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2022
UG mining costs ($/t milled) USD 41.1 *  
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Expansion CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 389
G&A costs $M USD 199.2
Subscription required - Subscription is required.

Pipelines and Water Supply
Source: Subscription required

- subscription is required.


Proposed Heavy Mobile Equipment as of June 30, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Bolter ....................... Subscription required 110 kW ....................... Subscription required Leased
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
Press Release 2023
Corporate Presentation 2022
Corporate Presentation 2022
Pre-Feasibility Study Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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