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Colombia
Nechí Mine

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 Location:
194 km NE from Medellín, Colombia

  Address:
Cra. 43a. Nro. 14-109 Piso 6o. Edificio Nova Tempo
Medellín
Colombia
A.A. 51763
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
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Overview

StageProduction
Mine TypeSurface
Commodities
  • Gold
  • Silver
Mining Method
  • Dredging
Production Start...
Mine Life12.7 years (as of Jan 1, 2021)


Owners

Source: p. 125
CompanyInterestOwnership
Mineros S.A. 100 % Indirect
Ownership Tree
Mineros, through Mineros Aluvial S.A.S., its wholly owned subsidiary, holds a 100% interest in the Nechí Alluvial Project under two types of mining titles: Recognition of Private Property (Reconocimiento de Propiedad Privada, RPP) and mining concession contracts (contrato de concesion minera).

Contractors

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Deposit Type

  • Alluvial / Placer


Summary:

The Nechí Alluvial Project is situated in the alluvial valley and flood plain of the Nechí River lower basin that lies within the foothills of the Central Cordillera of the Andes Mountains.

The Nechí alluvial deposits may be classed as a Tertiary gravel plain gold placer with bordering bench or terrace deposits. The gravel plain style of placer is Mineros’ primary exploration target for dredging. Gravel plain deposits are generally characterized by well-rounded gravels, few boulders, and fine gold distributed vertically and laterally in the pay formations. Such placers are formed in low-velocity shifting stream channels in low-gradient valleys. Gold grades in the Nechí River flood plain are elevated at the mouths of creeks draining the high ground (Segovia batholith) to the east and these areas likely represented the merging of creek or river placers with the main gravel plain. In the upper reaches of the Nechí River, the goldbearing gravel plain placers likely grade into river placers.

Gold in the Nechí alluvial gold deposits consists of free grains that are predominantly No. 4 or smaller. No. 4 grains are very fine (flour or powder gold), with individual grains weighing approximately 0.02 mg. No. 2 and No. 3 gold grains are also present. In terms of grain counting, No. 4, and smaller grains account for 96% of the grains logged in drill hole sampling, however, the weight contribution of No. 3 and No. 4 grains is 86%. As determined from fire assays of bu ........


Mining Methods

  • Dredging


Summary:

There are four main mining methods carried out at the Nechí Alluvial Property. The first, and predominant, method is alluvial plain mining using a combination of suction and bucket line dredges. The second method is suction plain mining using new “Brazilian” suction dredges that have on board processing plants. The third method is by the “Llanuras” production unit, which comprises a suction dredge (No. 20) for overburden removal, a modified suction dredge (No. 21) for mining the gold-bearing gravels, and a new floating plant called the “Llanuras Plant”. The fourth method is terrace/old tailings mining using an amphibious excavator.

Dredging operations are carried out 24 hours per day, 365 days per year. At approximately 80% availability due to equipment maintenance and clean-up, actual dredging is effectively 284 days per year. The nominal production capacity of each of five bucket line dredges, used to mine pay gravel, is 500 m3 /h. The nominal capacity of the seven wheel cutter suction dredges used to strip overburden, and modified suction dredge No. 21 to mine pay gravel, ranges from 300 m3 /h to 500 m3 /h. Planned annual production from mid-2021 to 2034 of 26.85 Mm3 results in an average hourly production rate of 4,084 m3 per hour (pay gravel plus overburden). The current mine life is 12.7 years with a combination of large suction and bucket line dredges, smaller alluvial plain wheel cutter (Llanuras production unit) and Brazilian rotary head suction dredges th ........


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits202220212020201920182017
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required80,44889,592
Silver oz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics2021
Tonnes milled  ......  Subscription required
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Reserves at December 31, 2021:
Mineral Reserves are estimated at cut-off grades of 38 mg/m³ for mining by bucket line dredges, 49 mg/m³ for Brazilian suction dredge alluvials, 39 mg/m³ for wheel cutter suction dredge plain alluvials, and 96 mg/m³ for terrace alluvials.

Mineral Resources for 2021 at Nechí are estimated at a raw gold cut-off grade of 34 mg/m3 for suction dredge plain alluvials, 85 mg/m3 for terrace alluvials, 43 mg/m3 for Brazilian dredge alluvials and dredge tailings.

CategoryTonnage CommodityGradeContained Metal
Proven 631,612 kt Gold 0.05 g/t 976 koz
Probable 116,976 kt Gold 0.05 g/t 181 koz
Proven & Probable 748,588 kt Gold 0.05 g/t 1,157 koz
Measured 1,063,400 kt Gold 0.04 g/t 1,217 koz
Measured & Indicated 1,063,400 kt Gold 0.04 g/t 1,217 koz

Commodity Production Costs:

CommodityUnits2022202120202019
Cash costs (sold) Gold USD  ......  Subscription required
Cash costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (sold) Gold USD  ......  Subscription required
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units20212020
Capital expenditures M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required
Gross profit M USD  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment as of October 29, 2021:
HME TypeModelSizeQuantityLeased or
Contractor
Backhoe ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dredge (bucket) 30 m3/min ....................... Subscription required
Dredge (suction) ....................... Subscription required Leased
Dredge (suction) 39 m3/min ....................... Subscription required
Dredge (suction) 43 m3/min ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 11, 2022
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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 - Subscription is required.

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