Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Processing |
- Heap leach
- Leaching plant / circuit
- Merrill–Crowe
- Cyanide (reagent)
|
Mine Life | 11.7 years (as of Jan 1, 2019) |
Herradura is one of Mexico’s largest open pit gold mines. |
Source:
p. 52
Deposit Type
- Vein / narrow vein
- Hydrothermal
Summary:
La Herradura deposit is located in the Sonora state in northwestern Mexico, approximately 80 km northwest of the town of Caborca.
Gold rich veins are restricted to the Proterozoic rocks which consist of biotite-feldspar-quartz and quartz-feldspar gneisses of sedimentary and plutonic origin. The hydrothermal system is structurally controlled and the higher grade mineralization occurs in quartz-sulfide veins filling tensional fractures. Quartz-sericite-albite alteration is widespread in the core of the deposit and grades to propylitic in the outer parts where the gneisses are more biotite rich.
Processing
- Heap leach
- Leaching plant / circuit
- Merrill–Crowe
- Cyanide (reagent)
Source:
Summary:
Herradura is open pit mine, heap leach and Merrill Crowe plants; two dynamic leaching plants (DLP).
Recoveries & Grades:
Commodity | Parameter | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 |
Gold
|
Head Grade, g/t
| 0.8 | 0.76 | 0.68 | 0.71 | 0.73 | 0.72 | 0.61 | 0.57 |
Silver
|
Head Grade, g/t
| 3.1 | 2.7 | 1.1 | 1.2 | 1.2 | 1.2 | 1.1 | 1.2 |
Production:
Commodity | Units | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
Gold
|
oz
| ......  | ......  | 473,638 | 520,366 | 398,866 | 265,564 |
Silver
|
oz
| ......  | ......  | ......  | ......  | ......  | ......  |
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Operational Metrics:
Metrics | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2011 |
Total tonnes mined
| ......  | ......  | ......  | 118,841 kt | 117,033 kt | 129,797 kt | |
Ore tonnes mined
| ......  | ......  | ......  | 25,159 kt | 22,875 kt | 22,305 kt | |
Tonnes processed
| ......  | ......  | ......  | 25,158,600 t | 22,875,421 t | 22,305,133 t | 21,020,356 t |
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Reserves at May 31, 2019:
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven & Probable
|
267,492 kt
|
Gold
|
0.78 g/t
|
6,679 koz
|
Measured
|
230,017 kt
|
Gold
|
0.8 g/t
|
5,916 koz
|
Indicated
|
143,330 kt
|
Gold
|
0.82 g/t
|
3,779 koz
|
Measured & Indicated
|
373,350 kt
|
Gold
|
0.81 g/t
|
9,695 koz
|
Inferred
|
3,623 kt
|
Gold
|
0.89 g/t
|
105 koz
|
Corporate Filings & Presentations:
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Aerial view:
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