Overview
Stage | Permitting |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longhole open stoping
- Cemented paste backfill
|
Mine Life | 11 years (as of Jan 1, 2021) |
This PEA considers the viability of a low-CAPEX start-up for Ollachea with an underground mine, gravity concentration and carbon in leach (“CIL”) plant designed to treat 1500 tonnes per day (“tpd”) over the first three years (Stage 1), ramping up to 3000 tpd during the fourth year (Stage 2).
June 2023 - The Company continues to maintain and generate new dialogue with potential parties that have expressed an interest in participating in the construction of Ollachea. Advanced due diligence and discussions are currently underway, considering both traditional and alternative financing options or a strategic alliance that creates value for stakeholders. |
Source:
p. 5,20
The Minera IRL Ltd. owns the Ollachea Project through Compañía Minera Kuri Kullu S.A., Minera IRL SA’s subsidiary.
Contractors
- Subscription is required.
Deposit Type
- Vein / narrow vein
- Orogenic
Summary:
The Property hosts orogenic-style gold (Au) mineralization at the Property, and quartz veining in the Minapampa area is the principal area of interest. Orogenic gold deposits often form in clusters and are mined as both open-pit lower-grade high-tonnage mines and higher-grade lower-tonnage underground mines. Clusters of orogenic deposits frequently align along regionally significant structures.
Orogenic Au deposits are often associated with greenschist to amphibolite grade metamorphism. Au is often concentrated in quartz lodes formed in brittle structures and can be associated with other elements such as Sb, As, Te and W.
Outcropping geology at the Property is dominated by sheared metasedimentary units, including phyllite, and graphitic slate and shale. Metasediments have a well-developed, eastnortheast trending, and north dipping cleavage that approximately mirrors regional thrusting.
Intrusions of varied age and composition have interrupted metasedimentary units. Metasedimentary units have been altered with weak but pervasive sericitization. Alteration is not apparently related to mineralization.
Gold mineralization at Minapampa is principally developed in phyllite between the Ollachea and Paquillusi thrust faults. The package of mineralized metasediments (Mineralized Package) is approximately 200m thick. Two zones of mineralization have been defined in the Mineralized package: Minapampa and Concurayoc.
Gold mineralizat ........
Mining Methods
- Longhole open stoping
- Cemented paste backfill
Summary:
Bottom-up Long Hole Open Stoping (“LHOS”) with paste-fill is considered as the optimal mining method for the Property. Stopes will be accessed longitudinally (along strike) on each level by, one, two or three strike drives, dependent on lode thickness.
Access to the mine will be via two portals. Development has already commenced from the lower portal, with the exploration ramp.
LHOS is defined as a moderate production, non-entry, bulk mining method most applicable to large, regular mineralized bodies. Level intervals are nominally 15 – 25 m floor to floor. Production holesare drilled by longhole methods, from either the upper or lower development horizons. A slot raise is excavated first then the remaining block of mineralized material in the stope is blasted. Loading is done from the drive by a load-haul-dump machine (LHD). To ensure the safety of the LHD operator, once the brow of the stope has opened this operation is done remotely.
The mining sequence retreats from stopes at the extremities of a mineralized body back towards the access. This means each stope has an individual slot, and the stope is retreated to maximum safe distance, determined based on the rock quality index, where it is completed, and is generally past filled from the level above. Once the fill has cured, the next stope in the sequence on that level can begin. To ensure continuity within the production profile, it is imperative that multiple levelsare available for ext ........
Source:
- subscription is required.
Source:
Summary:
- subscription is required.
Source:
- subscription is required.
Projected Production:
Commodity | Units | Avg. Annual | LOM |
Gold
|
oz
| 66,000 | 876,200 |
All production numbers are expressed as metal in doré.
Operational Metrics:
Metrics | |
Daily ore mining rate
| ...... |
Daily mining capacity
| ...... |
Daily processing rate
| ...... |
Daily processing capacity
| ...... |
Waste tonnes, LOM
| ...... |
Ore tonnes mined, LOM
| ...... |
Tonnes processed, LOM
| ...... |
* According to 2021 study.
Reserves at June 30, 2021:
Mineral Resources are diluted and are reported within optimized underground stope shapes. The stope shapes were optimized at a gold cut-off value of 1.4 grams per tonne.
Category | Tonnage | Commodity | Grade | Contained Metal |
Indicated
|
10.7 Mt
|
Gold
|
3.28 g/t
|
1.13 M oz
|
Inferred
|
7.3 Mt
|
Gold
|
2.7 g/t
|
0.6 M oz
|
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.