Overview
Stage | Permitting |
Mine Type | Underground |
Commodities |
- Copper
- Gold
- Silver
- Molybdenum
|
Mining Method |
|
Mine Life | 23 years (as of Jan 1, 2021) |
The Quebradona project comprises the Nuevo Chaquiro deposit, a significant copper-gold porphyry. Quebradona will be a copper mine with gold and silver as by-products and is at a development stage.
Quebradona - the optimisation of the Feasibility Study (FS) is still ongoing and no additional exploration has been completed.
Following the decision of Colombia’s national environmental licensing agency (ANLA) in November 2021 to archive the Company’s environmental licence application for the Quebradona project, AngloGold Ashanti filed an appeal seeking to secure further details on the specific additional information required for ANLA to make a decision on AngloGold Ashanti’s licence submission. On 29 April 2022, ANLA denied the appeal and confirmed its decision to archive the Company’s application. AngloGold Ashanti is preparing a new Environmental Impact Assessment which the Company intends to submit with the licence application. |
Source:
p. 70,124
AngloGold Ashanti (Minera de Cobre Quebradona S.A.S, Beneficio de Interes Colectivo (BIC) is the owner and operator of the Quebradona project.
Contractors
- Subscription is required.
Summary:
Geology
The geology of Nuevo Chaquiro consists of a volcanoclastic sequence of Miocene age (ash, tuffs, agglomerates and andesites) intruded by small dykes of diorite and quartz diorite which are also of Miocene age. The host rocks are intruded by different pulses of mainly medium to fine-grained quartz diorites. The majority of the intrusives do not reach surface and remain as a blind deposit despite erosion acting for a significant period. These intrusive rocks are categorised as pre-mineral, early, intra-mineral and late, according to cross-cutting interrelationships, spatial occurrence and copper-gold values. The alteration develops a well-zoned porphyry type system with alteration reflecting different temperatures from propylitic, sericitic, chloritic-sericitic, potassic to calcic-potassic assemblages. Higher-grade copper-gold mineralisation is associated with a well-developed quartz vein stockwork in the cupola zone of early quartz diorite which persists over a vertical interval of 500m.
Deposit type
Nuevo Chaquiro is a typical porphyry copper deposit with large tonnes and low-grade, with gold, molybdenum, and silver by-products. The structural setting facilitated the rise of intrusive bodies through the volcaniclastic sequence of the Combia Formation.
Mineralisation style
The Nuevo Chaquiro deposit consists of Miocene-aged diorite, quartz diorite dykes and thin vertical stocks intruding a thick succession of andesitic tuffs and volcaniclastic rocks of the Miocene ........
Summary:
The selected mining method for Quebradona is the common caving method of sub-level-caving which was chosen to maximise the best Mineral Resource extraction that is aligned with the TSF capacity of 119Mt. SLC is a mass mining method that has a higher dilution rate (>10% external to the blasted production ring envelope) compared to other underground mining methods. Drill and blast activities are used to fracture the orebody under controlled conditions. This commences at the top of the mine design and sequentially moves downwards in regular uniform horizontal slices — (27.5m vertical spacing). Draw-points are installed (drilled and blasted using explosives) 3m behind an actively retreating production face towards the level access. The extraction sequence is scheduled to maintain a production rate of 6Mpta (exclusive of development material). Each drawpoint is drilled sequentially (10 to 15 production rings may be drilled in advance) and fired as required along each production drill drive evenly spaced 15m apart. Predefined ore tonnage (mine call) is extracted from each drawpoint from 3 main active production levels with the schedule assuming a 100% compliance to the mine call. Broken rock is allowed 10 fill the voids within the drawpoint, thus allowing caving to propagate up towards the surface.
The production activities for a 6.2 Mtpa (inclusive of development material) operation promotes continuous caving by allowing the overlying rock 10 break and cave, thus result ........
Source:
- subscription is required.
Source:
Summary:
- subscription is required.
Projected Production:
Commodity | Units | LOM |
Copper
|
k lbs
| 2,935,530 |
Gold
|
koz
| ...... |
Silver
|
koz
| ...... |
All production numbers are expressed as metal in concentrate.
Operational Metrics:
Metrics | |
Annual mining rate
| ...... |
Annual ore mining rate
| ...... |
Annual processing capacity
| ...... |
Waste tonnes, LOM
| ...... |
Ore tonnes mined, LOM
| ...... |
Total tonnes mined, LOM
| ...... |
Tonnes processed, LOM
| ...... |
* According to 2021 study.
Reserves at December 31, 2021:
As of December 31, 2022, there were no changes in the Mineral Resources and Reserves at Quebradona compared to December 31, 2021.
The Ore Reserve was estimated at a cut-off value of $30/t NSR.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
120.01 Mt
|
Copper
|
1.23 %
|
3,250 M lbs
|
Probable
|
120.01 Mt
|
Gold
|
0.67 g/t
|
2.6 M oz
|
Probable
|
120.01 Mt
|
Silver
|
7.29 g/t
|
28.11 M oz
|
Proven & Probable
|
120.01 Mt
|
Copper
|
1.23 %
|
3,250 M lbs
|
Proven & Probable
|
120.01 Mt
|
Gold
|
0.67 g/t
|
2.6 M oz
|
Proven & Probable
|
120.01 Mt
|
Silver
|
7.29 g/t
|
28.11 M oz
|
Measured
|
86.74 Mt
|
Copper
|
0.95 %
|
1,814 M lbs
|
Measured
|
86.74 Mt
|
Gold
|
0.5 g/t
|
1.41 M oz
|
Measured
|
86.74 Mt
|
Silver
|
5.72 g/t
|
15.95 M oz
|
Measured
|
86.74 Mt
|
Molybdenum
|
174 ppm
|
33 M lbs
|
Indicated
|
227.33 Mt
|
Copper
|
0.87 %
|
4,338 M lbs
|
Indicated
|
227.33 Mt
|
Gold
|
0.46 g/t
|
3.34 M oz
|
Indicated
|
227.33 Mt
|
Silver
|
5.59 g/t
|
40.87 M oz
|
Indicated
|
227.33 Mt
|
Molybdenum
|
144 ppm
|
72 M lbs
|
Inferred
|
305.94 Mt
|
Copper
|
0.48 %
|
3,231 M lbs
|
Inferred
|
305.94 Mt
|
Gold
|
0.23 g/t
|
2.27 M oz
|
Inferred
|
305.94 Mt
|
Silver
|
3.66 g/t
|
36.05 M oz
|
Inferred
|
305.94 Mt
|
Molybdenum
|
135 ppm
|
91 M lbs
|
Total Resource
|
620.02 Mt
|
Copper
|
0.69 %
|
9,384 M lbs
|
Total Resource
|
620.02 Mt
|
Gold
|
0.35 g/t
|
7.02 M oz
|
Total Resource
|
620.02 Mt
|
Silver
|
4.66 g/t
|
92.86 M oz
|
Total Resource
|
620.02 Mt
|
Molybdenum
|
144 ppm
|
197 M lbs
|
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.