Overview
| Stage | Construction |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Longhole open stoping
- Cemented backfill
- Paste backfill
|
| Production Start | ...  |
| Mine Life | 18 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. |
Source:
p. 1-2
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 ........
Source:
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Flow Sheet:
Summary:
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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.
| Category | Tonnage | Commodity | Grade | Contained 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
|
Pipelines and Water Supply
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Corporate Filings & Presentations:
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