Overview
| Status | Closing / Closed |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 5 years (as of Jan 1, 2013) |
Sept. 2022 - The La Trinidad open pit area is currently undergoing reclamation under a “Closure Plan”.
During 2019, it was determined, through a comprehensive geological/engineering study, that a portion of the pit at La Trinidad would not be accessible to continue mining. This impact to operations was a result of pit instability incurred during the hurricane event in late 2018. As a result, the Company ceased mining activities in March 2019 and processed the remaining ounces on the leach pad during 2019. Nearly all of the mining and process plant equipment was moved to the United States, with the exception of the laboratory equipment, which was moved to Nicaragua. |
Source:
p. 5
In March 2021, GR Silver Mining Ltd., concluded the acquisition of 100% of Marlin Gold Mining Ltd. (“Marlin”) from Mako Mining Corp. (“Mako”). Marlin owns 100% of Oro Gold de Mexico, S.A. de C.V., a Mexican company, that includes the past producing La Trinidad open pit gold mine.
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
Summary:
The Sierra Madre Occidental geologic province is richly endowed with precious metal deposits (Staude and Barton, 2001), most of which are considered related to porphyry Cu-(Au), and epithermal systems. Gold mineralization at Trinidad has been described as vein and hydrothermal and tectonic breccia-hosted low sulfidation epithermal style mineralization (Robertson and Thoman, 1994).
Potentially economic mineralization identified by Marlin Gold and Eldorado (Robertson and Thomson, 1994; Exploraciones Eldorado, 1995) at Taunus is consistent with intensely silicified tectonic and quartz-matrix hydrothermal breccia, with chlorite and hematite, and occasional adularia. Quartz-textures are described as massive, fine-grained and cherty, drusy coatings, colloform banding and cockscomb. Amethyst also occurs in the Taunus area. Distal alteration is described as quartz veinlets in both andesite and quartz-feldspar porphyritic rocks, and weak propylitic alteration in the andesite rocks. Carbonate minerals are not reported, but may occur outside of areas affected by sulfide weathering.
The breccia zones are hosted within a quartz-feldspar porphyry unit, and its contact with adjacent andesite rocks. This lithologic contact is described as both structural, and intrusive in nature.
Gold occurs in vugs and less commonly in a goethite replacement of pyrite or encapsulated withinthe quartz matrix.
The rock matrix is largely silicified and cut by quartz ........
Summary:
The final pit was determined to be approximately 225 m deep, 900 m from north to south, 550 m from east to west with a total volume of 27 Mm3. Above a cut-off grade of 0.17 g/t Au, the total feed is estimated at 7.8 Mt at a grade of 1.12 g/t Au with a strip ratio of 7.2:1 (waste:feed) and 281 koz of gold contained insitu before recovery. The production schedule calls for a 5 year mine life with annual gold delivery to the heap of 30 koz Au, 40 koz Au, 60 koz Au, 60 koz Au and finally 90 koz Au with an average LoM total production rate of 37 kt/d.
The mine fleet will likely consist of 100 t capacity (Caterpillar 777 or equivalent) rigid body haul trucks supported by either front end loaders or hydraulic excavators. Blasting will be included in the default mine assumptions but some areas may be amenable to free-dig operations.
Source:
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Flow Sheet:
Summary:
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Production:
| Commodity | Units | 2019 | 2017 | 2016 | 2015 |
|
Gold
|
oz
| ...... | 36,979 | 24,238 | 14,060 |
All production numbers are expressed as metal in doré.
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Operational Metrics:
| Metrics | 2016 | 2015 |
|
Tonnes milled
| 720,042 t | 659,491 t |
|
Total tonnes mined
| | 10,326,065 t |
Reserves at February 1, 2013:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Indicated
|
4,326 kt
|
Gold
|
1.79 g/t
|
248,610 oz
|
|
Inferred
|
1,925 kt
|
Gold
|
0.84 g/t
|
52,245 oz
|
Commodity Production Costs:
| | Commodity | Units | 2019 |
|
Cash costs
|
Gold
|
USD
|
......
|
|
All-in costs
|
Gold
|
USD
|
......
|
Financials:
| | Units | 2017 | 2016 |
|
Revenue
|
M CAD
|
69.3
|
28.4
|
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Corporate Filings & Presentations:
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