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Mexico
La Trinidad Mine

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 Location:
28 km SE from Rosario, Sinaloa, Mexico

  Regional Office:
595 Burrard Street Suite 2833
Vancouver
British Columbia, Canada
V7X 1K8
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageReclamation
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life5 years (as of Jan 1, 2013)
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. Surplus supplies and equipment will continue to be sold over the coming months.
Reclamation activities at the La Trinidad mine commenced during the eight months ended December 31, 2019. The Company intends to complete the reclamation activities on La Trinidad by the middle of 2022.


Owners

Source: p. 5
CompanyInterestOwnership
GR Silver Mining Ltd. 100 % Indirect
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 ........


Mining Methods

  • Truck & Shovel / Loader


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.


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnits2019201720162015
Gold oz  ......  Subscription required36,97924,23814,060
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics20162015
Tonnes milled 720,042 t659,491 t
Total tonnes mined 10,326,065 t

Reserves at February 1, 2013:

CategoryTonnage CommodityGradeContained 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:

CommodityUnits2019
Cash costs Gold USD  ......  Subscription required
All-in costs Gold USD  ......  Subscription required

Financials:

Units20172016
Revenue M CAD 69.3   28.4  



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 22, 2020
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Corporate Filings & Presentations:

DocumentYear
Management Discussion & Analysis 2022
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Press Release 2018
Management Discussion & Analysis 2017
Press Release 2017
Management Discussion & Analysis 2016
Management Discussion & Analysis 2015
Preliminary Economic Assessment 2013
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