Overview
Stage | Pre-Feasibility |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Bench & Fill
- Sub-level stoping
- Transverse stoping
- Avoca
- Cemented backfill
- Dry waste backfill
- Hydraulic backfill
|
Mine Life | 9 years (as of Jan 1, 2022) |
On March 16, 2023, Mineros S.A. announced the results of the Hemco Technical Report, which included the results of the pre-feasibility study on the Porvenir Project. |
Source:
p. 16,39
Mineros holds a 99.9975% interest in the Hemco Property through its interest in its subsidiary, Hemco Nicaragua S.A. Mineros holds a 99.995% interest in Hemco Nicaragua directly, and a further 0.0025% interest indirectly through Mineros Aluvial S.A.S. BIC (Mineros Aluvial), a wholly owned subsidiary of Mineros. The remaining 0.0025% interest in Hemco Nicaragua is held by Mercantil Colpatria S.A. (Colpatria), a major shareholder of Mineros. Hemco Nicaragua holds a 100% interest in the majority of the concessions that constitute the Hemco Property.
Contractors
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Deposit Type
- Epithermal
- Volcanic hosted
- Vein / narrow vein
Summary:
The Porvenir, Leticia, and San Antonio deposits are within the Constancia Group.
The majority of mineralization within the concession area consists of volcanic hosted gold-silver ± copper, lead, and zinc epithermal quartz veins of intermediate sulphidation type.
There is a vertical zonation of metals, and base metal contents are higher at depth, although, in general, gold grades appear to stay constant except in those areas near surface where residual gold has been liberated by the oxidation of pyrite and weathering/disintegration of host rock.
The epithermal veins at Bonanza are characterized by moderate to intense propylitic alteration of the andesite wall rocks locally accompanied by argillic alteration and silicification. There are several variations in style of mineralization among the veins.
In the Bonanza district, all of the veins are interpreted to lie in the middle to deeper levels of an epithermal system. On the basis of base metal content, the Porvenir, Leticia and San Antonio veins in the Constancia Group are interpreted to be deeper relative to the Pioneer and Panama groups.
The Porvenir gold vein system comprises five main veins, part of the Constancia Group. The five main veins at Porvenir are Porvenir Norte, Oro Fino, Real McKoy, Elena, and Porvenir Sur.
Mining Methods
- Bench & Fill
- Sub-level stoping
- Transverse stoping
- Avoca
- Cemented backfill
- Dry waste backfill
- Hydraulic backfill
Summary:
The Porvenir Project will be a stand-alone mining operation with its own processing plant and infrastructure. The deposit is able to support a production rate of 2,000 tpd and mining plans are based upon underground trackless mechanized mining and truck haulage from the mine to a plant to be built at Porvenir. Following Mineros practice at the other Hemco mines, mine development, drilling, blasting, loading, and haulage will be done by contractors.
The Project has been split into three zones:
• Porvenir Norte is the largest zone by tonnage; the zone is up to 1,000 m along strike and 3.3 m to 30 m thick (14.2 m average) extending from the 0 m level to the 370 m level.
• Porvenir Sur is the second largest zone and is up to 600 m long on strike and 4.4 m to 15.9 m thick (10.7 m average) extending from the 150 level to the 430 m level.
• Real McKoy is the smallest tonnage but highest gold grade and highest NSR/t zone. It is up to 600 m long on strike and 0.5 m to 3.1 m thick (1.7 m average) extending from the 170 level to the 415 m level.
There is a portion between the Porvenir Norte and Porvenir Sur which has been mined by others and has been excluded from the Mineral Reserve estimate. Similarly, the uppermost areas which have been exploited by artisanal miners are not included in the reserves.
Mine Design
The Porvenir deposit is located within a hill and there is ready access to the deposit using drifts driven from surface. ........

Source:

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Flow Sheet:
Summary:

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Reserves at December 31, 2022:
Mineral Reserves Breakeven NSR cut-off values vary from $81.34/t to $83.10/t, depending upon the mining method.
Mineral Resources are estimated at a net smelter return (“NSR”) cut-off value of US$82.30/t for sub-level stoping resource shapes. A minimum mining width of 0.8 m was used to create resource shapes.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven & Probable
|
5,794 kt
|
Gold
|
3.07 g/t
|
572 koz
|
Proven & Probable
|
5,794 kt
|
Silver
|
10.32 g/t
|
1,922 koz
|
Proven & Probable
|
5,794 kt
|
Zinc
|
2.96 %
|
379 M lbs
|
Measured & Indicated
|
1,033 kt
|
Gold
|
2.35 g/t
|
78.2 koz
|
Measured & Indicated
|
1,033 kt
|
Silver
|
8.13 g/t
|
270.1 koz
|
Measured & Indicated
|
1,033 kt
|
Zinc
|
2.53 %
|
57.7 M lbs
|
Inferred
|
1,694 kt
|
Gold
|
2.42 g/t
|
132.1 koz
|
Inferred
|
1,694 kt
|
Silver
|
12.1 g/t
|
656.3 koz
|
Inferred
|
1,694 kt
|
Zinc
|
3.64 %
|
135.9 M lbs
|
Source:

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Corporate Filings & Presentations:
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