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United States
Livengood Project

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 Location:
113 NW from Fairbanks, Alaska, United States

  Project Contacts:
506 Gaffney Road, Suite 200
Fairbanks
Alaska, United States
99701
Phone  ...  Subscription required
Fax907-328-2832
EmailEmail
WebsiteWeb
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Overview

StagePre-Feasibility
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life23 years (as of Jan 1, 2016)
Latest NewsInternational Tower Hill Mines Announces the Closing of US $10.3 Million Public ATM Offering     October 16, 2020


Owners

Source: p. 36
CompanyInterestOwnership
International Tower Hill Mines Ltd 100 % Indirect

Deposit Type

  • Vein / narrow vein


Summary:

Among gold deposits of the Tintina Gold Belt, Livengood mineralization is most similar to the dike and sillhosted mineralization at the Donlin Creek deposit, where gold occurs in narrow quartz veins associated with dikes of similar composition (Ebert, et al., 2000). The age of the intrusions and the coincidence of mineralization and intrusive rocks are typical of those of other nearby gold deposits of the Tintina Gold Belt, which have been characterized as intrusion-related gold systems (Newberry and others, 1995; McCoy and others, 1997). For these reasons Livengood is best classified with these deposits.

Gold mineralization is associated with disseminated arsenopyrite and pyrite in volcanic, sedimentary and intrusive rocks, and in quartz veins cutting the more competent lithologies, primarily volcanic rocks, sandstones, and to a lesser degree, ultramafic rocks. Mineralization appears to be contiguous over a map area approximately 2.5 km2; a 0.1 g/mt grade shell averages 280 m thick and drilling has not closed off the deposit at depth. The stronger zones of mineralization are associated with areas of more abundant dikes. South of the Lillian Fault individual mineralized envelopes are tabular and follow stratigraphic units, particularly the Devonian volcanics, or lie in envelopes that dip up to 45° to the south, mimicking the structural architecture and attitude of the diking. On the north side of the Lillian fault mineralization is similar in style and orientation and hosted primarily in steeply dipping Upper Sediments. Three principal stages of alteration are currently recognized; in order from oldest to youngest, these are characterized by biotite, albite, and sericite. Arsenopyrite and pyrite were introduced primarily during the albite and sericite stages. Gold correlates strongly with arsenic and occurs primarily within and on the margins of arsenopyrite and pyrite grains. Carbonate was introduced with and subsequent to these stages. Dating of the sericite alteration (Athey, Layer, and Drake, 2004) indicates that mineralization and alteration were contemporaneous with the emplacement of the dikes.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Livengood Gold Project is a conventional surface mine that will utilize large-scale mining equipment for standard open pit mining of a blast/load/haul operation. Mining was scheduled to provide a mill feed of 52,600 t/d (47,700 mt/d). Preproduction stripping of 86.7 Mt (78.6 Mmt) of waste rock material is required for the construction of process facilities and site infrastructure. Mineralized material mined during preproduction will be stockpiled for mill feed later in the production period, after mill start-up.

All pits were designed with bench heights of 65.6 ft (20 m) and bench face angles of 70°. As the mining height is 32.8 ft (10 m) a bench, the mining of the pit walls will be double benched; catch benches were designed on alternating mining benches. Catch bench width varies depending upon the pit wall’s relation to the ultimate pit. The inter-ramp slope angle (ISA) for the ultimate pit is 42°, requiring a catch bench width of 48.9 ft (14.9 m). Pit phases that are internal to the ultimate pit were designed with a steeper ISA of 47°, giving a 37.4 ft (11.4 m) catch bench width. These internal pits are mined earlier in the production sequence and the internal pit walls are mined out by subsequent phase pushbacks, until the final pit slope of the ultimate pit is reached. The internal pits are scheduled to be mined in a period of around three years to minimize the time exposed to the steepened slopes. Slope heights for the internal pits were also limited to 395 to 525 ft (120 to 160 m) maximum between haul roads, step outs, and areas of shallower slopes. The pit designs also accounted for haul road access to all mining areas and minimum practical mining widths, based on the specified mining equipment. Haul roads were designed at a grade of 10% with a width of 100 ft (30.5 m), which is 3.5 times the width of the selected 320 t (290 mt) haul trucks (28.5 ft or 8.7 m). The haul road network internal to the ultimate pit limits was designed to one pit exit location.

The optimized production schedule provides an operating life of 23 years. A two-year preproduction period is required for removal of waste rock material and site construction. Mine production will produce mill feed mineralized material for 16 years. During the mine production period, low grade mineralized material will be stockpiled to be used for future mill feed, while waste rock material will be placed in a waste rock stockpile. Portions of the low grade, stockpiled, mineralized material will be sent to the mill during the mine production period, supplementing direct mine production tonnes to maintain constant mill throughput. After mining is complete, the mill will be fed from the remaining low grade stockpile for seven years.


Crushing and Grinding


Processing

  • Gravity separation
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The recovery methods for the Project were established on the basis of previously noted laboratory-scale testwork programs, information from equipment suppliers and on BBA’s experience on similar projects. Significant process plant configuration changes implemented within the PFS compared to the FS include the addition of secondary crushing ahead of the SAG mill for more efficient use of power, inclusion of a single line SAG/ball mill configuration, and simplification of the mill foundation and pebble re-grind circuit. Recent metallurgical testwork completed has also resulted in the grind size being coarsened from 90 to 180 µm (P80), as well as a reduced leach circuit retention time from 32 to 24 hours.

The nominal Livengood process plant capacity at 92% is 52,600 t/d (47,700 mt/d) resulting in an annual capacity of 19.2 Mt/y (17.4 Mmt/y). Run of mine ore is transported to the primary gyratory (54/75) crusher, where it is crushed and stockpiled in a covered pile, then convey ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 0.71
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold oz 294,1006,763,900
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio 1.3 *
Daily ore mining rate 52,600 tons *
Waste tonnes, LOM 554,825 k tons *
Ore tonnes mined, LOM 431,729 k tons *
Tonnes milled, LOM 431,729 k tons *
Daily processing capacity 52,600 tons *
Annual processing capacity 19.2 M tons *
* According to 2016 study.

Reserves at September 8, 2016:

CategoryTonnage CommodityGradeContained Metal
Proven 377.65 Mt Gold 0.71 g/t 8,620 koz
Probable 14.01 Mt Gold 0.72 g/t 352.86 koz
Proven & Probable 391.66 Mt Gold 0.71 g/t 8,973 koz
Measured 497.34 Mt Gold 0.68 g/t 10,841 koz
Indicated 28.04 Mt Gold 0.69 g/t 620.33 koz
Measured & Indicated 525.38 Mt Gold 0.68 g/t 11,461 koz
Inferred 52.8 Mt Gold 0.66 g/t 1,127 koz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Gold USD 877 / oz *
All-in sustaining costs (AISC) Gold USD 976 / oz *
All-in costs Gold USD 1,247 / oz *
Assumed price Gold USD 1,250 / oz *
* According to 2016 study / presentation.

Operating Costs:

Units2016
OP mining costs ($/ton mined) USD 1.73 *
OP mining costs ($/ton milled) USD  ......  Subscription required
Processing costs ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required
* According to 2016 study.
Subscription required - Subscription is required.

2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $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 3,259
Refining and transportation $M USD  ......  Subscription required
G&A costs $M USD 552
Total OpEx $M USD  ......  Subscription required
Total 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 @ 0% $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 0% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of September 8, 2016:
HME TypeSizeQuantity
Compactor 300 HP 1
....................... Subscription required ....................... Subscription required 2
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....................... Subscription required ....................... Subscription required 18
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 7, 2019
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Pre-Feasibility Study Report 2017
Pre-Feasibility Study Report 2016
Feasibility Study Report 2013
Subscription required - Subscription is required.

News:

NewsDate
International Tower Hill Mines Announces the Closing of US $10.3 Million Public ATM Offering October 16, 2020
International Tower Hill Mines Announces $7.9 Million Participation by Existing Major Shareholders in US $10.3 Million... September 2, 2020

Subscription required - Subscription is required.

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