Overview
| Status | Closing / Closed |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
Between 2017 and 2019, was completed the active closure and reclamation of the Alamo Dorado mine. |
Source:
p. 64
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
- Breccia pipe / Stockwork
Summary:
The silver-gold mineralization at Alamo Dorado is predominantly fracture-controlled and associated with moderate to intense pervasive silification. About 50 percent of the silver mineralization is related to strongly fractured rhyodacites and about 30 and 10 percent in the rhyolites and dacites, respectively. The main silver mineral at Alamo Dorado appears to be chlorargyrite which is a silver mineral derived from a silver chloride complex occurring along with the quartzpyrite minerals filling the fractures. The gold mineralization occurs as free, micron-size particles and/or in the crystal lattices of micro-crystalline pyrite.
Summary:
Alamo Dorado is a conventional surface mine that utilizes hydraulic shovels, front end loaders, and mechanical trucks on 5 metre high benches. Ore control is carried out by sampling blast holes to provide closer spaced sample data for marking the ore and waste boundaries during mining.
Source:
Summary:
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Production:
| Commodity | Product | Units | 2017 | 2016 | 2015 | 2014 | 2013 |
|
Silver
|
Metal in conc./ doré
|
koz
| 641 | 1,864 | 2,970 | 3,473 | 5,079 |
|
Gold
|
Metal in conc./ doré
|
oz
| ...... | ...... | ...... | ...... | ...... |
|
Copper
|
Metal in concentrate
|
t
| ...... | ...... | ...... | ...... | ...... |
Operational Metrics:
| Metrics | 2017 | 2016 | 2015 | 2014 | 2013 |
|
Tonnes milled
| 451.8 kt | 1,833 kt | 1,799 kt | 1,763 kt | 1,790 kt |
|
Daily milling capacity
| | 4,000 t | 4,000 t | | |
Reserves at December 31, 2015:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
1.6 Mt
|
Silver
|
55 g/t
|
2.9 M oz
|
|
Proven
|
1.6 Mt
|
Gold
|
0.23 g/t
|
12.2 koz
|
|
Measured
|
1.2 Mt
|
Silver
|
50 g/t
|
1.8 M oz
|
|
Measured
|
1.2 Mt
|
Gold
|
0.23 g/t
|
8.5 koz
|
|
Indicated
|
0.9 Mt
|
Silver
|
78 g/t
|
2.1 M oz
|
|
Indicated
|
0.9 Mt
|
Gold
|
0.4 g/t
|
10.9 koz
|
Commodity Production Costs:
| | Commodity | Units | 2017 | 2016 | 2015 |
|
Cash costs
|
Silver
|
USD
|
16.5 / oz†
|
16 / oz†
|
11.4 / oz†
|
|
Total cash costs
|
Silver
|
USD
|
|
|
|
|
All-in sustaining costs (sold)
|
Silver
|
USD
|
17.7 / oz†
|
14.9 / oz†
|
12.7 / oz†
|
† Net of By-Product.
Financials:
| | Units | 2017 | 2016 |
|
Capital expenditures
|
M USD
|
|
|
|
Revenue
|
M USD
|
18
|
45.8
|
|
After-tax Income
|
M USD
|
-7.4
|
-0.2
|
|
EBIT
|
M USD
|
-8.5
|
3.3
|
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Corporate Filings & Presentations:
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