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Australia
Mt Todd Project

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 Location:
230 km SE from Darwin, Northern Territory, Australia

  Project Contacts:
Level 1, 43 Cavenagh House Cavenagh Street
GPO Box 3449
Darwin
Northwest Territories, Australia
0801
Phone  ...  Subscription required
Fax+61-8-8941-9108
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
  • Copper
Mining Method
  • Truck & Shovel / Loader
Mine Life13 years (as of Jan 1, 2019)
Underperformance of the project and higher operating costs led to the mine being closed and placed on care and maintenance on November 14, 1997.

In September 2019, Vista Gold Corp. announced the positive results of an updated preliminary feasibility study for Mt Todd and subsequently amended this study in September 2020 to correct and/or clarify certain items (the “2019 PFS”). In February 2022, Vista Gold Corp. published Feasibility Study for the Mt Todd Gold Project.

All major operating and environmental permits have now been approved.

Vista Gold’s 11 tonnes per year Mt Todd in the Northern Territory is expected to restart in the March quarter 2024.


Owners

Source: p. 31
CompanyInterestOwnership
Vista Gold Corp. 100 % Indirect
Vista Gold Australia Pty Ltd. (operator) 100 % Direct
Vista Gold Corp. holds Mt Todd through its wholly-owned subsidiary Vista Gold Australia Pty. Ltd.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Orogenic
  • Vein / narrow vein
  • Intrusion related


Summary:

The Batman and Quigleys gold deposits of the Mt Todd Mine are formed by hydrothermal activity, concomitant with retrograde contact metamorphism and associated deformation, during cooling and crystallization of the Tennysons Leucogranite and early in D2.

The deposits are similar to other gold deposits of the porphyry copper gold (PCG) and are classified as orogenic gold deposits in the subdivision of thermal aureole gold style. The Batman deposit shares some characteristics with intrusion-related gold systems, especially in terms of the association of gold with bismuth and reduced ore mineralogies. This makes the deposit unique in the PCG.

The geology of the Batman deposit consists of a sequence of hornfelsed interbedded greywackes, and shales with minor thin beds of felsic tuff. Bedding is striking consistently at 325°, dipping at 40° to 60° to the southwest. Minor lamprophyre dykes trending north-south pinch and swell, cross cutting the bedding.

Northerly trending quartz sulfide veins and joints striking at 0° to 20°, dipping to the east at 60° are the major location for mineralization in the Batman deposit. The veins are 1 millimeter (mm) to 100 mm in thickness with an average thickness of around 8 mm to 10 mm. The veins consist of dominantly quartz with sulfides on the margins. The veining occurs in sheets with up to 20 veins per horizontal m. These sheet veins are the main source of mineralization in the Batman deposit.

A varie ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Project is designed to be a conventional, owner-operated, large open-pit mining operation that will use large-scale mining equipment in a drill/blast/load/haul operation

The truck and shovel method provides reasonable cost benefits and selectivity for this type of deposit. Only open-pit mining methods are considered for mining at Mt Todd.

Open pit ore totals 208 Mt grading 0.84 g/t and contains 5.6 Moz of gold. Open pit production will have a 2.5:1 strip ratio over the 13-year LoM. Upon completion of conventional mining, the existing heap leach pad will be processed.


Crushing and Grinding
Source: Subscription required

- subscription is required.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsDaily
Gold koz  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics
Daily ore mining rate 50,000 t *
Daily processing capacity 50,000 t *
Annual processing capacity 17.8 Mt *
Stripping / waste ratio 2.52 *
Waste tonnes, LOM 522,990 kt *
Ore tonnes mined, LOM 207,687 kt *
Total tonnes mined, LOM 730,677 kt *
Tonnes processed, LOM 200,273 kt *
* According to 2019 study.

Reserves at September 10, 2019:
Batman and Quigleys resources are quoted at a 0.40g-Au/t cut-off grade. Heap Leach resources are the average grade of the heap, no cut-off applied.
Batman deposit reserves are reported using a 0.40 g-Au/t cutoff grade.

CategoryTonnage CommodityGradeContained Metal
Proven 72,672 kt Gold 0.88 g/t 2,057 koz
Probable 148,369 kt Gold 0.79 g/t 3,791 koz
Proven & Probable 221,041 kt Gold 0.82 g/t 5,848 koz
Measured 78,319 kt Gold 0.88 g/t 2,213 koz
Indicated 220,767 kt Gold 0.8 g/t 5,661 koz
Measured & Indicated 299,086 kt Gold 0.82 g/t 7,874 koz
Inferred 65,304 kt Gold 0.77 g/t 1,608 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required
Total cash costs (sold) Gold USD  ......  Subscription required
All-in sustaining costs (sold) Gold USD  ......  Subscription required
Assumed price Gold USD  ......  Subscription required
* According to 2019 study / presentation.

Operating Costs:

Units2019
OP mining costs ($/t mined) USD 1.82 *  
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 1,743
Site services costs $M USD 35
Refining costs $M USD  ......  Subscription required
G&A costs $M USD 246.3
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
Operating margin (LOM) $M USD  ......  Subscription required
Net Income (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 @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $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 September 10, 2019:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required 1.5 cu. m ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 22, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 14, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Pre-Feasibility Study Report 2014
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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