Overview
Stage | Construction |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Production Start | ... |
Mine Life | 11.3 years (as of Jan 1, 2023) |
Borborema Project is a greenfield open pit gold project. Aura released Borborema’s Feasibility Study information in August 2023 and in September 2023 the Board of Directors approved to start its construction. Initial steps are underway to obtain permits for relocating the road.
On September 30, 2023, the Borborema project is 5.8% completed and is on time to start-up in February 2025. |
Source:
p. 22
Borborema is 100% owned by Aura Minerals through its wholly-owned subsidiary Cascar Mineração Ltda (Cascar).
Contractors
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Deposit Type
- Mesothermal
- Vein / narrow vein
Summary:
Deposit Types
The Borborema deposit, Borborema Project, is considered to be a classic orogenic-gold deposit type in a sheared and deformed Archaean to Proterozoic age greenstone belt sequence, that is comprised of metamorphosed volcanic-sedimentary rocks units intruded by slightly younger post-tectonic igneous bodies.
Studies carried out in the Borborema Project area (Phillips, 2011) concluded that the gold deposit is classified as a mesothermal orogenic-gold type in view of its key characteristics.
Gold mineralisation at the Borborema Project, Borborema Province, occurs in a succession of (meta) pelitic and psammopelitic schists intruded by minor occurrences of pegmatite and granitic orthogneiss (Stewart: 2011). Rocks are metamorphosed in upper greenschist facies to amphibolite conditions (Araújo et al., 2002; Stewart, 2011).
Mineralization And Alteration
The Borborema deposit is located within a northeast–southwest trending structure which forms part of the northern segment of the Santa Mônica dextral shear zone (Araujo et. al, 2002). The shear zone displays a penetrative north-northeast-trending fabric, dipping southeast at around 40 degrees. In the Project area the principal mineralised shear zone, termed the Morro Pelado Shear, is around 30 metres thick.
The mineralization is strongly controlled by regional structure with secondary structuring providing the preferred host for gold (Figure 29). In addition to the main ........
Summary:
At the Borborema Project, the ore is very close to surface and continues at depth. The initial 11 years and 4 months is planned for open pit mining.
The proposed mining operations are based on the use of hydraulic excavators and a haul truck fleet engaged in conventional open pit mining techniques.
Excavated material will be loaded into trucks and hauled to either the run-of-mine (ROM) pad, the low-grade stockpile, oxide ore stockpile or the waste rock storage facilities (WRSF). Ore excavation and haulage will be monitored by quality control personnel employed by the Geology department and details of material movement will be recorded by a radio dispatch system. Weathered material is considered to be free to dig with transitional material to be lightly blasted to loosen it for digging. Fresh rock will be typically blasted on 5 m benches for ore domain and 10 m benches for the waste domain.
The following parameters were used to design the final pit:
* Bench height: 20 m.
* Ramp width 2 lanes: 13.2 m.
* Ramp width 1 lane: 9.3 m.
* Ramp maximum gradient: 10%.
* Berm width: 6 m.
* Face angle: 43.5° (oxide), 55° (east wall), 80° (west wall).
* Road constraint south: 40 m from center line for each side.
* High voltage transmission line north: 20 m from center line for each side.
Production Schedule
Mine scheduling assumptions are as follows:
• Plant capacity: 2.0 Mtpy.
Source:
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Flow Sheet:
Summary:
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Pipelines and Water Supply
Source:
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Projected Production:
Commodity | Product | Units | Avg. Annual | LOM |
Gold
|
Payable metal
|
koz
| 65 | 748 |
Gold
|
Metal in doré
|
koz
| 72 | |
Operational Metrics:
Metrics | |
Annual mining rate
| ...... |
Annual processing capacity
| ...... |
Stripping / waste ratio
| ...... |
Waste tonnes, LOM
| ...... |
Ore tonnes mined, LOM
| ...... |
Tonnes processed, LOM
| ...... |
* According to 2023 study.
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Reserves at July 31, 2023:
The Mineral Reserve cut-off grade calculated for the Borborema Project is 0.40 g/t Au.
Mineral Resource reported above 0.33 g/t Au cut-off.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
Total
|
22,455 kt
|
Gold
|
1.12 g/t
|
812 koz
|
Indicated
|
Sulphide
|
61.3 Mt
|
Gold
|
1.02 g/t
|
2,015 koz
|
Indicated
|
Oxide
|
2.4 Mt
|
Gold
|
0.79 g/t
|
62 koz
|
Indicated
|
Total
|
63.7 Mt
|
Gold
|
1.01 g/t
|
2,077 koz
|
Inferred
|
Sulphide
|
10.8 Mt
|
Gold
|
1.13 g/t
|
390 koz
|
Inferred
|
Oxide
|
0.1 Mt
|
Gold
|
0.83 g/t
|
3 koz
|
Inferred
|
Total
|
10.9 Mt
|
Gold
|
1.13 g/t
|
393 koz
|
Corporate Filings & Presentations:
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