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Mexico
Los Reyes Project

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 Location:
114 km NW from Mazatlan, Sinaloa, Mexico

  Project Contacts:
Calle Pedro Moreno #24, Int. Segundo Piso Col. Centro
Hermosillo
Sonora, Mexico
83000
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
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  • Filings & News

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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Heap leach
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life11 years (as of Jan 1, 2014)
Latest NewsVista Gold Corp. Receives $1.1 Million Guadalupe de los Reyes Payment     January 11, 2021


Owners

 
CompanyInterestOwnership
Prime Mining Corp. 100 % Indirect
Minera Gold Stake, S.A. de C.V. 100 % Direct

Deposit Type

  • Epithermal
  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

The Guadalupe area is enclosed by an east- southeast trending mineralized structure that extends over 2.5 km and is up to 100 meters in width. It is composed of two main veins, Guadalupe and San Manuel, with stockwork and numerous quartz veinlets in between.

Guadalupe (including Laija and West Areas) Deposit.
The Guadalupe area is enclosed by an east-southeast trending mineralized structure that extends over 2.5 km by up to 100 meters in width. It is composed of two main veins, Guadalupe and San Manuel, with stockwork and numerous quartz veinlets in between. The Guadalupe Mine zone presents a southwest steep dip and was developed by underground methods to a depth of some 400 meters, 10-13 production levels, along a strike length of approximately 1,000 meters.

The Guadalupe mineralized structure is enclosed by volcanic rocks of the Lower Volcanic Sequence, which dip gently eastward and consists of andesitic flows and tuffs. This area was divided into three sections for exploration purposes, Guadalupe West, Laija and East.

Chiripa – San Miguel – Noche Buena Deposits. The San Miguel deposit is enclosed by the Chiripa-San Miguel-Noche Buena mineralized structure. It consists of a northwest trending fault system dipping 50-60º to the southwest. It has been traced for a distance of 1.4 km and tested with some stopes, trenches and adits.

The Chiripa-San Miguel structure is enclosed by andesitic rocks of the Lower Volcanic Sequence, which appear to be intruded by an argillic altered, feldspar-horblende-biotite porphyry dike. Mineralization is associated with the brecciated zones along the structure and in proximity to the dike, with apparent concentration at the footwall.
The Noche Buena deposit constitutes the southern extension of the San Miguel zone, and is part of the same mineralized structure.

El Orito Zone.
This is located about 4 km to the north of the Guadalupe mine. It consists of an extended, moderate to strong, argillic alteration zone. It has been explored by surface workings along an apparent structure that shows strong oxidation, quartz veining, and kaolinization. The geologic structure crops out within volcanic rocks of the Upper Series, with orientation to the NW 40-45º SE. The alteration appears to indicate a structure with a length of about 3,000 meters.

Mineralization.
In the Guadalupe de Los Reyes area, gold and silver mineralization have been found along a series of northwesterly and west-northwesterly structural zones. Mineralization in this area is typical of low sulfidation epithermal systems consisting of quartz-adularia veins and stockwork zones. The gold and silver minerals are associated with the quartz. It appears that two stages of silicification occur within the area; the first stage brought commonly banded quartz, typically of a pale yellow-green color, while the second consisted of white crystalline quartz. It appears that the gold and silver minerals are most commonly associated with the first stage yellow-green chalcedonic quartz.

In thin section studies of the host rocks, andesite to felsite are variably altered showing plagioclase converted to potassic feldspar. In many instances the host rock is completely replaced by fine-grained quartz or sericite with relatively abundant adularia. Gold occurs as grains that generally range from 5 to 30 microns, but have been occasionally observed up to 230 microns (0.23 mm) in diameter. Free gold and silver minerals are observed associated with quartz veins and in patches of sericite. Fine grains of pyrite occur typically oxidized to limonite or hematite, which in volume are estimated at less than 0.5 percent.

Alteration consists predominantly of silicification and sericitization. Silicified volcanic rocks typically show partial to complete replacement of the original components by fine-grained quartz. Typical silicification of the enclosing rocks grades from complete replacement by quartz to partial silicification. From the footwall of the structures towards the hanging wall the silicification grades into stockworks. Incipient propylitic alteration appears associated to areas of less dense quartz veining with presence of chlorite and pyrite.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Guadalupe de los Reyes Project has been divided into East and West areas. The West area open pits are El Zapote North, El Zapote South, San Miguel North, San Miguel South, and Noche Buena. The proposed mining methods for the Guadalupe de los Reyes deposit is conventional open pit methods utilizing off-highway trucks and loaders. Mining is proposed to occur sequentially in five open pits.

The West area pit designs incorporate a 50 degree inter-ramp pit slope depending on rock type. Bench configuration is based on triple benching 5-meter benches with a dig-face angle of 70 degrees. The majority of benches were designed with five-meter-wide benches with 7- meter catch benches. Catch benches were designed at every third bench.

Haul roads were designed for a total width of 15 meters, which accommodates the main haul surface, berms, and ditches. All haul roads were designed not to exceed 10 percent gradients. This haul road width and grade will support the selected truck size.


Crushing and Grinding


Processing

  • Gravity separation
  • Heap leach
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The recovery method chosen for the Los Reyes is a conventional milling circuit with a gravity and carbon-in-leach (CIL) and heap leach process.

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required
Gold Equivalent Recovery Rate, %  ......  Subscription required
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsLOM
Gold Metal in doré koz 328
Gold Payable metal koz 328
Silver Payable metal koz  ......  Subscription required
Silver Metal in doré koz  ......  Subscription required
Gold Equivalent Metal in doré koz  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio 11.7 *
Daily ore mining rate 1,500 t *
Waste tonnes, LOM 64.5 Mt *
Ore tonnes mined, LOM 5.5 Mt *
Total tonnes mined, LOM 70 Mt *
Tonnes milled, LOM 5.5 Mt *
Annual mining rate 540,000 t of ore *
* According to 2014 study.

Reserves at April 16, 2018:

CategoryTonnage CommodityGradeContained Metal
Indicated 6,843,000 t Gold 1.73 g/t 380,100 oz
Indicated 6,843,000 t Silver 28.71 g/t 6,315,300 oz
Inferred 3,200,000 t Gold 1.49 g/t 155,200 oz
Inferred 3,200,000 t Silver 34.87 g/t 3,639,000 oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold Equivalent USD 563.92 / oz *
Assumed price Silver USD 28 / oz *
Assumed price Gold USD 1,480 / oz *
* According to 2014 study / presentation.

Operating Costs:

Units2014
OP mining costs ($/t mined) USD 1.31 *
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2014 study.
Subscription required - Subscription is required.

2014 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 129.3
G&A costs $M USD 8.1
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of July 3, 2014:
HME TypeSizeQuantity
Dozer 350 HP 2
....................... Subscription required 2
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 6
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
Subscription required - Subscription is required.

Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Vista Gold Corp. Receives $1.1 Million Guadalupe de los Reyes Payment January 11, 2021
Prime Mining Reports Results of Guadalupe East Sampling at Los Reyes Continue to Demonstrate Resource Expansion Potential October 26, 2020
Prime Mining Finds More Significant Surface Mineralization at its Los Reyes Gold-Silver Project August 19, 2020
Prime Mining Completes Acquisition of Los Reyes Gold-Silver Project July 20, 2020
Prime Mining Reports Los Reyes Surface Sample Results of 63.0 Metres at 1.78 gpt Gold and 71.0 gpt Silver June 30, 2020
Prime Mining Closes C$10,000,000 Marketed Offering June 12, 2020
Prime Mining Corp. Announces C$10,000,000 Marketed Offering and Appointment of New Board Member May 22, 2020
Prime Mining Reports 58.5 Metres at 0.83 gpt Gold and 20.2 gpt Silver from Guadalupe West At Los Reyes April 21, 2020
Prime Mining Files NI 43-101 Technical Report on the Los Reyes Project, Mexico April 7, 2020
Prime Mining Announces Measured and Indicated In-Pit Oxide Mineral Resource of 19.8 Million Tonnes Containing 833,000 Gold Equivalent Ounces at 1.31 gpt at Los Reyes Project, Mexico April 2, 2020
Prime Mining Completes Surface and Access Rights Agreement for Los Reyes March 3, 2020
Prime Mining Reports 39.0 Metres at 6.75 gpt Gold and 58.2 gpt Silver from Zapote South At Los Reyes February 26, 2020
Prime Mining Reports 37.5 Metres at 3.9 gpt Gold and 36.5 gpt Silver from Zapote South At Los Reyes February 5, 2020
Prime Mining Reports Up To 30 Metres at 3.9 gpt Gold and 40 gpt Silver Between Zapote North and South at Los Reyes January 20, 2020
Prime Mining Raises Over $8.7 Million and Acquires Rights to Los Reyes Gold Project in Mexico August 28, 2019
Minera Alamos Updates Progress at Guadalupe de los Reyes Gold Project, Sinaloa, Mexico June 19, 2018

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