Overview
| Status | Temporary Suspension |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
Operations at the Mirador Alta Gracia mine were temporarily halted in June 2020. |
Source:
p. 327
Gold Resource operations in Oaxaca are conducted through its Mexican subsidiary, Don David Gold Mexico S.A. de C.V. (“DDGM”).
Gold Resource currently has 100% interest in ten properties in the Americas. Six of its properties, including two Operating Properties and four Exploration Properties, are within Oaxaca Mining Unit located in Oaxaca, Mexico, along the San Jose structural corridor.
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
- Volcanic hosted
Summary:
The DDGM area is predominantly volcanic rocks of presumed Miocene age, which overlay and intrude into basement rocks consisting of marine sediments. This district's gold and silver mineralization is related to the volcanogenic system and is considered epithermal in character. The DDGM mineralization occurs as structurally controlled epithermal deposits in veins and stockwork zones. The mineralization is associated with gangue minerals such as quartz, calcite, and other minor elements. Primary sulfide mineralization consists of pyrite galena, sphalerite, chalcopyrite, and different minor amounts of argentite and silver sulfosalts. It consists of concentrations of sulfides containing gold, silver, lead, copper, and zinc.
DDGM exploration efforts have been mainly focused on the Arista Project, which contains the Manto Vein, Arista, and Switchback vein deposits, and includes the significant Arista, Baja, and Soledad veins as well as multiple ancillary structures.
The second zone of interest is the Alta Gracia property, where low sulfidation epithermal, predominantly silver mineralized, veins are hosted in andesitic and rhyolitic rocks; this property has been investigated by drilling and surface and underground mapping of historical and recent workings. The Mirador and Independencia vein systems, which DDGM has mined, are one of several predominantly northeast trending vein systems on the property.
The sedimentary and volcanic units mapped at Alta ........
Summary:
In 2017, in addition to the Arista underground mine, DDGM completed development of the Mirador Mine at the Alta Gracia Project and began delivering development ore to the Aguila processing facility. Two mine portals were developed to provide access to the Mirador vein. Mine site offices and mobile equipment maintenance facilities were established adjacent to the mine portals. Additionally, a diesel power generation plant, compressed air and a mine water pumping stations were developed. Operations at the Mirador Alta Gracia mine were temporarily halted in June 2020.
Flow Sheet:
Summary:
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Combined production numbers are reported under
Don David Operation
Operational Metrics:
| Metrics | 2020 | 2019 | 2018 | 2017 |
|
Tonnes milled
| ...... | 31,962 t | 15,044 t | |
|
Ore tonnes mined
| ...... | | | 6,350 t |
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Reserves at December 31, 2021:
A breakeven cutoff grade of 2.36 g/t AuEq was used for mineral reserves and resources at the Mirador Underground Mine using gold and silver only to calculate AuEq.
| Category | Tonnage | Commodity | Grade |
|
Proven
|
3,000 t
|
Gold
|
0.85 g/t
|
|
Proven
|
3,000 t
|
Silver
|
392 g/t
|
|
Probable
|
50,800 t
|
Gold
|
0.27 g/t
|
|
Probable
|
50,800 t
|
Silver
|
169 g/t
|
|
Proven & Probable
|
53,800 t
|
Gold
|
0.3 g/t
|
|
Proven & Probable
|
53,800 t
|
Silver
|
181 g/t
|
|
Measured
|
24 kt
|
Gold
|
0.81 g/t
|
|
Measured
|
24 kt
|
Silver
|
367.95 g/t
|
|
Indicated
|
90 kt
|
Gold
|
0.61 g/t
|
|
Indicated
|
90 kt
|
Silver
|
327.18 g/t
|
|
Measured & Indicated
|
114 kt
|
Gold
|
0.65 g/t
|
|
Measured & Indicated
|
114 kt
|
Silver
|
335.82 g/t
|
|
Inferred
|
148 kt
|
Gold
|
0.62 g/t
|
|
Inferred
|
148 kt
|
Silver
|
295.61 g/t
|
Corporate Filings & Presentations:
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