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Mexico
Tahuehueto Project

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 Location:
24 km N from Topia, Durango, Mexico

  Project Contacts:
Insurgentes Sur 682 piso 9, Col. Del Valle, Del. Benito Juarez
Mexico
Mexico, Mexico
C.P. 03100
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
  • Copper
  • Lead
  • Zinc
Mining Method
  • Overhand Cut & Fill
Processing
  • Gravity separation
  • Flotation
Mine Life21 years (as of Jan 1, 2016)
Latest NewsTelson Initiates 3,500 Tonne Tahuehueto Toll Milling Campaign     November 19, 2020


Owners

Source: p. 2
CompanyInterestOwnership
Telson Mining Corp. 99 % Indirect
Real de la Bufa S.A. de C.V. 100 % Direct
The company holds 99% of the shares of its Mexican subsidiary, Real de la Bufa S.A. de C.V., which maintains 100% ownership in 7,492 hectare Tahuehueto Property, an advanced stage gold and base metal exploration and development project, located in northwestern Durango State, Mexico.

Deposit Type

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


Summary:

Mineralization at Tahuehueto is classified as intrusion related epithermal low sulfidation polymetallic AgAu style (Corbett, 2007), with Au and Ag accompanied by Cu, Pb, and Zn mineralization. These types of deposits are interpreted to have been derived from porphyry intrusion source rocks at depth.

Mineralization at Tahuehueto occurs as polymetallic epithermal veins with multiple mineralizing events overprinted on one another in the same vein structure. The primary host rock is andesite of the lower volcanic series, but in at least one case, the hydrothermal system penetrated felsic ignimbrite of the upper volcanic series. Styles of mineralization identified by Corbett (2007) include:
-Initial pervasive propylitic-potassic alteration with local specular hematite develops as intrusion-related alteration.
-Early chalcopyrite-pyrite mineralization, locally with quartz-barite typically forms early and at deeper crustal levels in polymetallic Ag-Au vein systems.
-Polymetallic Ag-Au mineralization comprising pyrite-galena-sphalerite ± chalcopyrite ± chalcopyrite ±Ag sulfosalts ± barite represents the volumetrically most apparent mineralization and displays pronounced vertical variation discerned as changes in the sphalerite color from dark brown Fe-rich high temperature sphalerite formed early and at depth to red, yellow and less commonly white sphalerite as the Fe-poor low temperature end member that typically develops at higher crustal levels and as a later stage. Much of this mineralization occurs as sulfide lodes or as breccia infill. Bulk lower grade mineralization occurs as fine grained Au and Ag sulfosalts deposited within base metal sulfides as part of the main polymetallic mineralization, rising to higher grade Ag with increased base metal contents. These events evolve to mineralization with a more epithermal character and locally higher Au-Ag grades at later stages where base metal sulfides are overprinted by Ag-rich tetrahedrite (freibergite).
-Highest Ag-Au grades locally occur in the absence of Cu-Pb-Zn in ores described as the epithermal end member of polymetallic Ag-Au mineralization which is strongly structurally controlled. High grade Ag may occur as freibergite with celadonite in combination with white sphalerite and dark chlorite commonly with later stage opalchalcedony. Semi-massive to banded chlorite locally occurs with celadonite-pyrite-opal and displays elevated Au with significantly lower Ag: Au ratios. Hypogene hematite occurs with banded quartz as an epithermal assemblage which accounts for elevated Au grades overprinting earlier sulfiderich mineralization.

Breccias are an integral part of the Tahuehueto hydrothermal system and display several genetic styles. Corbett (2007) notes that many of the sulfide-mineralized zones display sulfide transport textures; typical of fluidized breccias. Milled breccias are those in which the clasts have undergone significant working while being transported from deeper to elevated crustal settings. These breccias typically contain rounded clasts in a matrix of milled rock flour which has undergone hydrothermal alteration. Expansion breccias, in which the fragments have been moved apart and filled in with carbonate or quartz in a jigsaw pattern, are typical in dilational structural settings. Magmatic hydrothermal breccias typically occur in near porphyry environments and contain clasts of porphyry intrusions and alteration in a milled matrix. Shingle breccias with elongate, parallel shingle-like fragments, are thought to have been formed by collapse following the explosive escape of volatiles from an underlying magma chamber.

The uppermost portions of the mineralized structures are oxidized. In the oxide zone, mineralization consists of malachite, azurite, chalcocite, covellite, limonite, and hematite. Malachite overprints tetrahedrite, and chalcocite and covellite form coatings on sphalerite. The depth of the oxide-sulfide interface varies considerably, but is generally less than 100m.

Sulfide mineralization lies below the oxidized zone and consists of sphalerite, galena, chalcopyrite, tennantite, tetrahedrite, and probably electrum. Gangue minerals are quartz, pyrite, chlorite, sericite, and calcite. Locally a light green phyllosilicate mineral interpreted to be celadonite (Loucks, et al 1988) forms as gangue and is closely associated with high-grade gold and silver mineralization.


Mining Methods

  • Overhand Cut & Fill


Summary:

The mining method used as the basis for PFS design was Overhand–Cut and–Fill mining with conventional drilling, blasting, mucking and hauling, scaling and ground support installation and backfilling with unconsolidated, mined waste materials. Full mechanization was assumed using diesel, rubber tired mining equipment and support vehicles.


Crushing and Grinding


Processing

  • Gravity separation
  • Flotation

Flow Sheet: Subscription required

Summary:

The proposed processing plant is a conventional crushing/milling/flotation/filtering process designed to process 165,000 tonnes per year in 300 operating days, equivalent to 550 tonnes per day through the grinding and flotation circuits producing lead, copper, and zinc concentrates.

GRINDING SECTION
This section of the plant works 12 hours per day and will receive ore from the mine in 20 t capacity dump trucks and discharge to the coarse ore bin with a capacity of 60 t. The coarse bin will have a 46 cm grizzly. The ore rocks greater than 46 cm will be reduced with the use of pneumatic hammer or by hand.

The ore from the coarse ore bin, will be fed to a primary jaw crusher by a 61 cm apron feeder, before passing through a fixed 5 cm screen, to send directly to the secondary crusher, using the 61 cm conveyor belt.

The ore fed to the primary crusher, is crushed to a size -5 cm and also passed to the 61 cm conveyor belt, which is fed along with the pr ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Head Grade, g/t 3.4
Silver Head Grade, g/t 41.8
Copper Recovery Rate, %  ......  Subscription required
Copper Head Grade, % 0.3
Lead Recovery Rate, %  ......  Subscription required
Lead Head Grade, % 1.2
Zinc Recovery Rate, %  ......  Subscription required
Zinc Head Grade, % 2.2
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Metal in concentrate koz 16340
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics2019
Daily ore mining rate  ......  Subscription required
Stripping / waste ratio  ......  Subscription required0.5 *
Daily milling capacity  ......  Subscription required550 t *
Annual mining capacity  ......  Subscription required232,000 t *
Waste tonnes, LOM  ......  Subscription required1,640,370 t *
Ore tonnes mined, LOM  ......  Subscription required3,264,120 t *
Total tonnes mined, LOM  ......  Subscription required4,904,490 t *
Tonnes milled, LOM  ......  Subscription required3,264,120 t *
Annual milling capacity  ......  Subscription required165,000 t *
^ Guidance / Forecast.
* According to 2016 study.
Subscription required - Subscription is required.

Reserves at November 30, 2019:

CategoryTonnage CommodityGrade
Probable 3,264 kt Gold 3.4 g/t
Probable 3,264 kt Silver 41.8 g/t
Probable 3,264 kt Copper 0.35 %
Probable 3,264 kt Lead 1.19 %
Probable 3,264 kt Zinc 2.24 %
Measured & Indicated 6,114 kt Gold 2.48 g/t
Measured & Indicated 6,114 kt Silver 42.82 g/t
Measured & Indicated 6,114 kt Copper 0.31 %
Measured & Indicated 6,114 kt Lead 1.2 %
Measured & Indicated 6,114 kt Zinc 2.15 %
Inferred 3,501 kt Gold 1.31 g/t
Inferred 3,501 kt Silver 37.59 g/t
Inferred 3,501 kt Copper 0.27 %
Inferred 3,501 kt Lead 1.34 %
Inferred 3,501 kt Zinc 2.44 %

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Lead USD 0.87 / lb *
Assumed price Zinc USD 0.92 / lb *
Assumed price Copper USD 2.65 / lb *
Assumed price Silver USD 16.7 / oz *
Assumed price Gold USD 1,180 / oz *
* According to 2016 study / presentation.

Operating Costs:

Units2016
UG mining costs ($/t milled) USD 21.6 *
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2016 study.
Subscription required - Subscription is required.

2016 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
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 100.5
G&A costs $M USD 22.2
Total OpEx $M USD  ......  Subscription required
Mining Taxes $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  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 December 6, 2016:
HME TypeSizeQuantity
ANFO Loader 1
....................... Subscription required 3
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 2
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 3
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 15, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2016
Pre-Feasibility Study Report 2016
Subscription required - Subscription is required.

News:

NewsDate
Telson Initiates 3,500 Tonne Tahuehueto Toll Milling Campaign November 19, 2020
Telson Receives Conditional Approval for a US$12Mn Line of Credit from International Investment Bank to Finalize Tahuehueto Gold Mine Construction September 4, 2019
Telson Commences Tahuehueto Pre-Production Toll Milling Campaign August 16, 2019
Telson Mining: Tahuehueto Underground Development Exposes New Mineralization along Perdido Structure February 22, 2019
Telson Mining: Trafigura Commits 2nd Loan Tranche US$5 Million to Telson's Tahuehueto Mine Construction November 6, 2018

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