Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 10.9 years (as of Jan 1, 2022) |
Herradura is one of Mexico’s largest open pit gold mines. |
Source:
p. 6
La Herradura is operated by Penmont which is a wholly-owned subsidiary of Fresnillo.
Contractors
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Deposit Type
- Vein / narrow vein
- Mesothermal
Summary:
The mineralization comprises of gold-bearing, mesothermal style, high-angle quartz-iron oxide veins and stockworks.
Summary:
La Herradura is an open pit gold mine with a heap leach pad, Merrill Crowe Plant, two pregnant solution ponds, three contingency ponds, and associated pipework.
La Herradura is developed via conventional truck and shovel method with preliminary drilling and blasting operations. Approximately 250 Cat haulage trucks are utilized for the haulage ore and waste.
In 2019 Fresnillo began rolling out dual fuel systems into our haulage fleet. This programme involved the installation of engines which are able to automatically switch between powering the trucks by diesel and by Liquefied Natural Gas (LNG), depending on the terrain. By the end of 2021, the entire 785 and 793 haulage fleet had been converted.
Source:
Flow Sheet:
Summary:
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Production:
| Commodity | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Gold
|
oz
| ...... | ...... | ...... | ...... | 474,168 | 473,638 | 520,366 |
|
Silver
|
oz
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
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Operational Metrics:
| Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Ore tonnes mined
| ...... | ...... | 19,797 kt | 22,926 kt | 22,157 kt | 26,027 kt |
|
Total tonnes mined
| ...... | ...... | 109,014 kt | 124,486 kt | 124,024 kt | 130,025 kt |
|
Tonnes processed
| ...... | ...... | 19,797,063 t | 22,926,542 t | 22,156,792 t | 26,027,466 t |
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Reserves at May 31, 2022:
The Herradura Ore Reserves that are attributed to the heap leach are reported at cut-off grades of 0.23 g/t Au for oxide ore and 0.24 g/t Au for transition and sulphide ore. Oxide material above 0.97 g/t Au and transitional and sulphide material above 0.50 g/t Au are attributed to the mill.
Herradura open pit Mineral Resources are reported at various cut-offs dependent on material types and grade. Oxide material above 0.21 g/t Au and below 0.84 g/t Au reports to the heap leach; transitional and sulphide material above 0.22 g/t and below 0.45 g/t Au reports to the heap leach; oxide material above 0.84 g/t Au reports to the mill; transitional and sulphide material above 0.45 g/t Au reports to the mill.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
210,278 kt
|
Gold
|
0.81 g/t
|
5,476 koz
|
|
Probable
|
30,569 kt
|
Gold
|
0.76 g/t
|
750 koz
|
|
Proven & Probable
|
240,847 kt
|
Gold
|
0.8 g/t
|
6,225 koz
|
|
Measured
|
257,509 kt
|
Gold
|
0.81 g/t
|
6,710 koz
|
|
Indicated
|
42,820 kt
|
Gold
|
0.8 g/t
|
1,108 koz
|
|
Measured & Indicated
|
300,329 kt
|
Gold
|
0.81 g/t
|
7,818 koz
|
|
Inferred
|
23 kt
|
Gold
|
1.4 g/t
|
1 koz
|
| HME Type | Model | Quantity | Ref. Date |
|
Drill
|
.......................
|
.......................
|
Dec 31, 2021
|
|
Drill
|
.......................
|
.......................
|
Dec 31, 2021
|
|
Truck (haul)
|
.......................
|
.......................
|
Mar 23, 2022
|
|
Truck (haul)
|
.......................
|
.......................
|
Mar 23, 2022
|
|
Truck (haul)
|
.......................
|
.......................
|
Dec 31, 2019
|
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Corporate Filings & Presentations:
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