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Australia
Mt Todd Project

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

  Project Contacts:
GPO Box 3449
Darwin
Northwest Territories, Australia
0801
Phone  ...  Subscription required
Fax+61-8-8992-9011
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePre-Feasibility
Mine TypeOpen Pit
Commodities
  • Gold
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • Smelting
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • AARL elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • X-Ray sorting
  • Cyanide (reagent)
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. Because the Mt Todd site was not reclaimed when the mine closed, the dumps and heap leach pad require ongoing care and maintenance, which company provides.
Latest NewsVista Gold Drilling Confirms North Extension of the Batman Core Zone at the Mt Todd Gold Project     January 21, 2021


Owners & OPERATOR

Source: p. 32
CompanyInterestOwnership
Vista Gold Corp. 100 % Indirect
Vista Gold Australia Pty Ltd. (operator) 100 % Direct
Vista and its subsidiary, Vista Gold Australia Pty Ltd (Vista Australia) entered into an agreement to acquire an interest in the Project located in NT, Australia on March 1, 2006. The acquisition was completed on June 16, 2006 when the mineral leases comprising the Project were transferred to Vista Australia and funds held in escrow were released. Vista Australia is the operator of the Mt Todd property.

Deposit Type

  • Vein / narrow vein
  • Orogenic
  • 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 variety of mineralization styles occur within the Mt Todd area. Of greatest known economic significance are auriferous quartz-sulfide vein systems. These vein systems include the Batman, Jones, Golf, Quigleys and Horseshoe prospects, which occur within a north-northeast trending corridor, and are hosted by the Burrell Creek Formation. Tin occurs in a north-northwest trending corridor. The tin mineralization comprises cassiterite, quartz, tourmaline, kaolin, and hematite bearing assemblages, which occur as bedding to parallel breccia zones and pipes. Polymetallic Au, W, Mo, and Cu mineralization occurs in quartz-greisen veins within the Yinberrie Leucogranite; a late stage highly fractionated phase of the Cullen Batholith. The Batman Deposit extends approximately 2,200 m along strike, 400 m across dip and drill tested to a depth of 800 m. Drilling indicates the Batman mineralization to be open along-strike and down-dip.

The mineralization within the Batman deposit is directly related to the intensity of the north- south trending quartz sulfide veining. The lithological units impact on the orientation and intensity of mineralization.

Sulfide minerals associated with the gold mineralization are pyrite, pyrrhotite and lesser amounts of chalcopyrite, bismuthinite and arsenopyrite. Galena and sphalerite are also present, but appear to be postgold mineralization, and are related to calcite veining in the bedding plains and the east-west trending faults and joints.

Two main styles of mineralization have been identified in the Batman deposit. These are the north-south trending vein mineralization and bedding parallel mineralization.

The Quigleys deposit mineralization has a distinctive high-grade shallow dipping 30°-35° northwest shear zone extending for nearly 1 km in strike and 230 m vertical depth within a zone ofmore erratic lower grade mineralization.


Mining Methods

  • Truck & Shovel / Loader


Summary:

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


Processing

  • Smelting
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • AARL elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • X-Ray sorting
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The flowsheet consists of primary crushing, closed circuit secondary crushing, closed circuit tertiary crushing using high pressure grinding rolls (HPGRs), ore sorting, two-stage grinding, cyclone classification, pre-leach thickening, leach and adsorption, elution electrowinning and smelting, carbon regeneration, tailings detoxification and disposal to conventional tailings storage facility (TSF).

Process recovery was determined based on ore types. Three ore types, sulfide, mixed, and oxide were identified for the open pit and will have recoveries of 92.9%, 91.8%, and 91.5%, respectively. The heap leach pad will have a recovery of 90.7%. An additional 1% for net solution loss is applied to all the deposits and heap leach which results in a LoM average recovery of 91.9%.

The run of mine ore from the pit is expect to have a maximum particle size of 1000 mm and F80 to the primary crusher of 400 mm. Two stages of crushing, primary and secondary are required to reduce ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 0.82
Subscription required - 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
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

Reserves at September 10, 2019:

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 78,182 kt Gold 0.88 g/t 2,210 koz
Indicated 219,209 kt Gold 0.8 g/t 5,608 koz
Measured & Indicated 297,391 kt Gold 0.81 g/t 7,817 koz
Inferred 62,923 kt Gold 0.72 g/t 1,464 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required *
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.
Subscription required - Subscription is required.

Operating Costs:

Units2019
OP mining costs ($/t mined) USD 1.82 *
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/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
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 1,743
Site services costs $M USD 35
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 2
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 4
....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required 16
....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 4
....................... Subscription required ....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required ....................... Subscription required 4
....................... Subscription required ....................... Subscription required ....................... Subscription required 41
....................... Subscription required ....................... Subscription required ....................... Subscription required 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

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

News:

NewsDate
Vista Gold Drilling Confirms North Extension of the Batman Core Zone at the Mt Todd Gold Project January 21, 2021
Vista Gold Corp. Files Final Short Form Base Shelf Prospectus October 6, 2020
Vista Gold Corp. Announces Positive Independent Benchmarking Results of the 2019 Updated Preliminary Feasibility Study for the Mt Todd Gold Project March 24, 2020
Vista Gold Corp. Files Updated Preliminary Feasibility Study For The Mt Todd Gold Project October 7, 2019
Vista Gold Announces Updated Preliminary Feasibility Study for the Mt Todd Gold Project... September 10, 2019
Vista Gold Announces Updated Mt Todd Preliminary Feasibility Study Showing Strong Returns At US$1300 Gold Price January 24, 2018

Aerial view:

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