Overview
| Stage | Permitting |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Mine Life | 13.7 years (as of Jan 1, 2022) |
Source:
p. 22
The Cerro Blanco Gold Project exploitation concession, which covers an area of 15.25 km2, is owned by Elevar Resources S.A. (“Elevar”). Elevar is an indirect, wholly owned subsidiary of Bluestone Resources.
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
Summary:
Deposit Geology
The Cerro Blanco deposit is a classic hot springs-related, low-sulphidation quartz-adularia-calcite vein system. It is localised along a complex fault intersection created during late Miocene-Pliocene tectonic extension within the active Central American volcanic arc. Local igneous activities that drove the Cerro Blanco hydrothermal system include a vesicular andesite dike swarm and mineralization stage rhyolite / dacite flow dome eruption and cryptodome intrusion.
The Cerro Blanco vein systems are best developed (widest and most continuous) within the 300 to 500 m elevation ranges. Principal host rocks include a lithic tuff–calcareous shallow marine- volcaniclastic sequence and, to a lesser extent, the overlying volcaniclastic-hydrothermal breccia sequence of probable Pliocene age. Vein zones often appear to transition to barren calcite beneath the ±300 m elevation in the northern half of the deposit. To the south, high-grade quartz-adularia-calcite vein zones continue at least another 100 m down to 200 m elevation. Some veins remain open at depth.
Mineralization
The Cerro Blanco gold deposit occurs within a large hydrothermal alteration zone covering an area about 5 km long and 1 km wide. This zone exhibits the effects of strong, pervasive hot spring type hydrothermal alteration.
Gold mineralization is hosted within a broadly north-south striking sequence of westerly-dipping siltstones, sandstones, and limest ........
Summary:
The Cerro Blanco Gold Project will be mined by conventional open pit mining techniques using trucks and diesel-powered hydraulic excavators supported by production wheel loaders. Trucks will haul the ore to the primary crusher and to a run-of-mine (ROM) pad where it will be rehandled and processed through the concentrator.
The objective of pit phasing is to improve the economics of the Project by feeding the mill with higher-grade material during the earlier years and/or delaying waste stripping until later years. Internal phases are designed to have a lower stripping ratio than the subsequent phases. The Cerro Blanco deposit is split into two separate pits: the main pit and the satellite pit. The main pit is split into seven phases; three are in the north end, three are in the south end, and one is the final pit that includes both the north and south ends. The satellite pit has one phase.
Drill and blast specifications are established to effectively drill and blast a 10 m bench with a single pass. Loading in the pit will be performed by two 15 m3 face shovels and two 11 m3 wheel loaders. The loading units will be matched with a fleet of 90-tonne payload capacity mine haul trucks.
Over the mine life, the Project will produce 53.9 Mt of mill feed and 145.4 Mt of waste at an overall stripping ratio of 2.70. The total in-situ gold and silver ounces contained in the ultimate pit design are 2.85 Moz and 12.60 Moz, respectively, including the ........
Source:
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Flow Sheet:
Summary:
- subscription is required.
Reserves at November 1, 2021:
Mineral reserves are estimated at a cut-off grade of 0.50 g/t Au Eq.
The mineral resource estimate is reported at a base case above a 0.4 g Au/t cut-off.
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
In-Situ (OP)
|
37,618 kt
|
Gold
|
1.89 g/t
|
2,286 koz
|
|
Proven
|
In-Situ (OP)
|
37,618 kt
|
Silver
|
8.33 g/t
|
10,084 koz
|
|
Probable
|
In-Situ (OP)
|
16,279 kt
|
Gold
|
1.07 g/t
|
560 koz
|
|
Probable
|
In-Situ (OP)
|
16,279 kt
|
Silver
|
4.81 g/t
|
2,518 koz
|
|
Proven & Probable
|
In-Situ (OP)
|
53,896 kt
|
Gold
|
1.64 g/t
|
2,846 koz
|
|
Proven & Probable
|
In-Situ (OP)
|
53,896 kt
|
Silver
|
7.27 g/t
|
12,602 koz
|
|
Measured
|
Stockpiles
|
30 kt
|
Gold
|
5.4 g/t
|
5 koz
|
|
Measured
|
In-Situ (OP)
|
40,947 kt
|
Gold
|
1.8 g/t
|
2,382 koz
|
|
Measured
|
Stockpiles
|
30 kt
|
Silver
|
22.6 g/t
|
22 koz
|
|
Measured
|
In-Situ (OP)
|
40,947 kt
|
Silver
|
7.9 g/t
|
10,387 koz
|
|
Indicated
|
In-Situ (OP)
|
22,595 kt
|
Gold
|
1 g/t
|
706 koz
|
|
Indicated
|
In-Situ (OP)
|
22,595 kt
|
Silver
|
4.2 g/t
|
3,058 koz
|
|
Measured & Indicated
|
Stockpiles
|
30 kt
|
Gold
|
5.4 g/t
|
5 koz
|
|
Measured & Indicated
|
In-Situ (OP)
|
63,542 kt
|
Gold
|
1.5 g/t
|
3,089 koz
|
|
Measured & Indicated
|
Stockpiles
|
30 kt
|
Silver
|
22.6 g/t
|
22 koz
|
|
Measured & Indicated
|
In-Situ (OP)
|
63,542 kt
|
Silver
|
6.6 g/t
|
13,445 koz
|
|
Inferred
|
In-Situ (OP)
|
1,672 kt
|
Gold
|
0.6 g/t
|
31 koz
|
|
Inferred
|
In-Situ (OP)
|
1,672 kt
|
Silver
|
2.1 g/t
|
112 koz
|
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