Livengood, Alaska

The Livengood Gold Project is located approximately 70 miles northwest of Fairbanks, Alaska in the Tolovana mining district within the Tintina Gold Belt. The project area is centered on a local topographic high point named Money Knob. This feature and the adjoining ridge lines have been considered by many to be the lode gold source for the placer gold deposits which lie in the adjacent valleys and which have been actively mined since 1914 with production of more than 500,000 ounces of gold.

Key Facts of the Livengood Gold Project

Target Gold
The Livengood Gold Project is located along a paved highway approximately 70 miles northwest of Fairbanks, Alaska in the Tolovana mining district within the Tintina Gold Belt.
The Livengood area has been placer mined since 1914. ITH acquired the rights to the core Livengood property from AngloGold Ashanti in 2006 and has expanded the land position and gold resource since that time.
The Company controls 100% of its 75 square mile land package, which is made up of Alaska State mining claims, fee simple land, federal placer claims, mineral lands leased from the Alaska Mental Health Land Trust, and leases with private holders federal patented and unpatented lode and placer claims.
Gold mineralization occurs in two styles: as multistage fine quartz veins occurring in all lithology (commonly in or near intrusive dikes and sills), and as diffuse mineralization within volcanic, intrusive, sedimentary, and mafic-ultramafic rocks without a clear quartz vein association. The current resource and area drilled covers the most significant portion of the area with anomalous gold in surface soil samples, but still represents only about 25% of the total anomaly area.
Resources & Reserves
August 2016 - Gold resource: Measured & Indicated 11,461,170 ounces (525,380,000 tonnes at 0.68 g/t).  0.32-0.40* g/t cutoff, varies by rock type (*variable cut-off grade 0.40-0.85 g/t related to geological characteristic unique to Rocktype 7 quartz stibnite + jamesonite ratios). Gold Reserve:  Proven & Probable  8,973,290 ounces (391.66 tonnes at 0.71 g/t) using gold price of USD$1,250 per ounce.
  The Pre-Feasibility Study envisioned surface mining, then processing via gravity circuit followed by a whole ore carbon in leach circuit.
The Pre-Feasibility Study NI 43-101 was published October 24, 2016.

Introduction Description and Location History Geology and Mineralization Exploration, Drilling and Sampling
Quality Assurance / Quality Control and Data Verification Mineral Processing and Metallurgical Testing Resource Estimation Mining/Recovery Methods Project Infrastructure
Environmental Studies, Permitting and Social and Community Impacts Capital and Operating Costs      

Information on this website regarding the Livengood Project is derived from information contained in the NI 43‑101 compliant technical report entitled ""August 2011 Summary Report on the Livengood Project, Tolovana District, Alaska" dated August 25, 2011 by Carl E. Brechtel (PE), Tim Carew P.Geo., Russell Myers (CPG 11433), William Pennstrom Jr. M.A. (QP-MMSA), Chris Puchner (CPG 07048) and Scott Wilson (the "Livengood Report"). 

The following is a summary from the Livengood Report, a full copy of which is available on this website or under the Company's profile on SEDAR at The Livengood Report is specifically incorporated by reference herein.


The Livengood project is now in transition from an exploration project to undertaking a Pre-feasibility Study. As part of this shift to prefeasibility assessment, a Preliminary Assessment ("PA") was performed to evaluate preliminary project concepts including possible mineralization processing methods, estimates of capital and operating costs, and preliminary surface mine design scenarios in November 2010 (Carew, et al., 2010). An update of the PA was published on August 25, 2011 and is based on a resource estimate updated August 22, 2011, prepared from data to May 31, 2011 and based on other PFS technical information as of August 22, 2011.

Field investigations at the Livengood property are ongoing, with a total of 9 drilling rigs working at the site during the Summer 2011 program. Ongoing field data collection includes environmental baseline data collection (water quality sampling, wildlife studies, air quality) and meteorological sampling, geotechnical data collection for mine design, site evaluation and geotechnical data collection for project infrastructure location, groundwater hydrogeological testing, and rock geochemical characterization.  Drilling activities have been expanded to include district exploration and site condemnation, as well as continuing the resource definition and infill drilling at Money Knob. A 3D IP geophysical program to survey the Livengood District will be completed in Q3 2011. The geologic database supporting this report is the 648 diamond and reverse circulation holes that had been drilled on the property to May 31, 2011, and provided the basis for reporting an update of the in-situ gold resource estimate.

Description and Location

The Livengood property is located approximately 115 km northwest of Fairbanks, Alaska in the Tolovana mining district within the Tintina Gold Belt. The project area is centered on a local high point named Money Knob. This feature and the adjoining ridge lines have been considered by many to be the lode gold source for the Livengood placer deposits which lie in the adjacent valley to the north where they have been actively mined since 1914 with production of more than 500,000 ounces of gold.

The Company controls 100% of its ~125 square kilometre Livengood land package, which is made up of 115 Alaska State mining claims, fee simple land leased from the Alaska Mental Health Land Trust, and four leases with private holders of state and federal patented and unpatented mining and placer claims.


The property has been prospected and explored by several companies and private individuals since the 1970s. Geochemical surveys by Cambior in 2000 and AngloGold Ashanti (U.S.A.) Exploration Inc. ("AGA") in 2003 and 2004 outlined a 1.6 x 0.8 km area with anomalous gold in soil. Scattered anomalous samples continue along strike for an additional 2 km to the northeast and 1.6 km to the southwest. Eight reverse circulation holes were drilled by AGA in 2003 and a further 4 diamond core holes were drilled in 2004 to evaluate this anomaly. Favourable results from these holes revealed wide intervals of gold mineralization (BAF-7: 138.7m @ 1.07 g/t Au; MK-04-03: 55.3m @ 0.51 g/t Au) along with lesser intervals over a broad area.  Over the past 5 years, exploration by ITH through its wholly owned Alaskan subsidiary, Talon Gold Alaska, Inc., has evaluated this mineralization utilizing both RC drilling and core drilling.

Beginning in 2009, technical studies have been performed to generate metallurgical data for process definition, to generate preliminary surface mine designs, and to develop pre-conceptual information on the location and capacities of potential tailings management, overburden management, water reservoir, and mill process facilities. Conceptual project configurations have been generated from these studies which have been used as the basis for projected operating and capital cost estimation. A PEA for a large surface mining and mill processing facility was generated to update ITH information being developed for the current Pre-feasibility Study.

Geology and Mineralization

Rocks at Livengood are part of the Livengood Terrane, an east-west belt, approximately 240 km long, consisting of tectonically interleaved assemblages of various ages. These assemblages include the Amy Creek Assemblage, which is a sequence of latest Proterozoic and early Paleozoic basalt, mudstone, chert, dolomite, and limestone. In thrust contact above the Amy Creek Assemblage lies an early Cambrian ophiolite sequence of mafic and ultramafic sea floor rocks. Structurally above these rocks lies a sequence of Devonian shale, siltstone, conglomerate, volcanic, and volcaniclastic rocks which are the dominant host to the mineralization currently under exploration at Livengood. The Devonian assemblage is overthrust by more Cambrian ophiolite rocks. All of these rocks are intruded by Cretaceous multiphase monzonite, diorite, and syenite stocks, dikes, and sills. Gold mineralization is believed to be related to this intrusive event.

Gold mineralization occurs in two styles: as multistage fine quartz veins occurring in all lithologies (commonly in or near intrusive dikes and sills), and as diffuse mineralization within volcanic, intrusive, sedimentary, and mafic-ultramafic rocks without a clear quartz vein association. Four principal stages of alteration are currently recognized. These are an early biotite stage followed by albite-black quartz, followed by a sericite-quartz, and finally a carbonate stage. Arsenopyrite apparently has been introduced during all stages, and gold correlates strongly with arsenopyrite, but it is not clear whether gold was introduced during all four stages or preferentially during one or more stages.

Mineralization is interpreted to be intrusion-related, consistent with other gold deposits of the Tintina Gold Belt, and has a similar As-Sb geochemical association. Mineralization is controlled partly by lithologic units, but thrust-fold architecture is apparently key to providing pathways for magma (dikes and sills) and hydrothermal fluid.

Local fault and contact limits to mineralization have been identified, but overall the deposit has not been closed off in any direction. The current resource and area drilled covers the most significant portion of the area with anomalous gold in surface soil samples, but still represents only about 25% of the total anomaly area.

Exploration, Drilling and Sampling

Prior to ITH, several companies have explored the Livengood area and identified a sizeable area of anomalous gold in soil samples, and intervals of anomalous gold mineralization in drill holes. ITH advanced the soil sampling coverage and undertook to drill surface geochemical anomalies beginning in 2006. ITH has continued its exploration with step-out drilling on a 75 m grid, and infilling the 75 m pattern in the core of the mineralized areas. Infill and step out drilling in the resource area has continued in the Summer 2011 drill program.

ITH has also implemented a district exploration program, which includes core drilling in geochemical anomalies distal to the resource area and condemnation drilling in potential infrastructure locations. A 3D IP survey has also been conducted during the Summer of 2011 to generate targets over much of the district.

ITH has conducted drilling campaigns on the Livengood property since 2006. These programs initially identified mineralization in the Core Zone and then identified the Northeast, Sunshine, and Southwest zones through step out drilling and drill testing of areas with anomalous values in surface soil samples. 

Nearly all drill holes at Money Knob have been drilled in a northerly direction at an inclination of -50 (RC) and -60 (core) in order to best intercept the south dipping structures and mineralized zones as close to perpendicular as possible. A few holes have been drilled in other directions to test other features and aspects of mineralization. Most holes have been spaced at 75m along lines 75m apart, subsequent infill drilling in the center of 75m squares brings the nominal drill spacing to 50m for a significant portion of the deposit.

Diamond core holes represent 16% of the total number of holes drilled. Core is recovered using triple tube techniques to ensure good recovery (>95%) and confidence in core orientation. The core is oriented using either the ACTTM or the EZ MarkTM tools.

Reverse circulation holes are bored and cased for the upper 0-30m to prevent down hole contamination and to help keep the hole open for ease of drilling at greater depths. Recovery of sample material from RC holes is done via a cyclone and dry or wet splitter, according to conditions. Drill cuttings are collected over the course of each 1.5 m (five-foot) interval and captured for a primary sample, an equivalent secondary sample (“Met” sample) and a third batch of chips for logging purposes.

In the deposit drill hole locations are determined by sub-meter differential GPS surveys at the drill collar. The initial azimuth of drill hole collars is measured using a tripod mounted transit compass in conjunction with a laser alignment device mounted on the hole collar. Down hole surveys of core and RC drill holes are completed using a Gyro-Shot survey instrument manufactured by Icefield Tools Corporation. Results of surveys and duplicate tests show normal minor deviation in azimuth and inclination for drill holes.

All RC samples are “logged in” on site, analyzed with a field portable Thermo Fisher Scientific NITONTM XRF before being sealed in super sacks and delivered to ALS Chemex in Fairbanks for preparation. Detail logging and mark-up of core is done at the Livengood camp. Core is sawed in half and bagged according to geologic intervals up to 1.5m and sealed in super sacks for delivery to ALS Chemex in Fairbanks.

Samples are analyzed by standard 50g fire assay for the gold determinations. All core samples and select RC drilling samples are also submitted for multi-element ICP-MS analyses using a 4 acid digestion technique. All RC samples are analyzed on site for trace elements using a Thermo Fisher Scientific NITONTM portable XRF before shipment to the laboratory.

Corebox 3D Model


Quality Assurance / Quality Control and Data Verification

The QA/QC program implemented by ITH meets or exceeds industry standards. A QA/QC program includes insertion of blanks and standards (1/10 samples) and duplicates (1/20 samples). Blanks help assess the presence of any contamination introduced during sample preparation and help calibrate the low end of the assay detection limits. Commercial standards are used to assess the accuracy of the analyses. Duplicates help assess the homogeneity of the sample material and the overall sample variance. ITH has undertaken rigorous protocols to assure accurate and precise results. Among other methods, weights are tracked throughout the various steps performed in the laboratory to minimize and track errors. A group of 2096 metallic screen fire assays performed in 2011 did not indicate any bias in the matching fire assays.

Data entry and database validation procedures have been checked and found to conform to industry practices. Procedures are in place to minimize data entry errors. These include pre-numbered, pre-tagged, bar-coded bags, and bar-coded data entry methods which relate all information to sample and drill interval information. Likewise, data validation checks are run on all information used in the geologic modeling and resource estimation process. Database entries for a random sample (10%) of drill holes used for the resource estimate were checked against the original Assay Certificates by Mr. Carew and the error rate was found to be within acceptable limits.

Mineral Processing and Metallurgical Testing

ITH has undertaken metallurgical and processing test work to determine optimal recoveries using numerous conventional flow sheets: including milling with gravity, flotation, and Carbon in Leach (CIL) or gravity and CIL of the gravity tails, and heap leaching. Current test work focuses on determining the best means of optimizing these combined recovery methods. This work involves studies that evaluate how gold mineralization occurs and how the mineralized materials vary in their physical and metallurgical response to process treatment parameters according to the various lithologic units that host mineralization. The characteristics under review include grindability, abrasiveness, optimal particle size for downstream treatment, and response to leach, flotation, or gravity unit operations as a function of oxidation and lithology.

Specific metallurgical characteristics, identified in the testing programs to date, have shaped the processing strategies used as the basis for this PEA and assumed project configuration. These important metallurgical findings are:

  1. variable metallurgy (chemical and physical properties), depending upon mineralization type, degree of oxidation, amount of organic carbon, etc.;
  2. identification of mineralization types that are amenable to simple cyanide leaching process techniques such as heap leaching in conjunction with a carbon in column adsorption plant (CIC), particularly oxidized and partially oxidized mineralization; 
  3. identification of sediment-hosted mineralization that contains organic “preg-robbing” carbon that will require CIL process techniques;
  4. higher recoveries for most mineralization types using gravity separation in combination with downstream CIL and/or flotation separation techniques; and
  5. lower recoveries for mineralization types with arsenic association.

Specific observations about metallurgical performance are listed in the following:

  • Most Livengood mineralization could be considered moderately soft to medium hard in hardness with an average Bond Ball Work index of 15.8. The mineralization varied significantly in hardness, with Bond Ball Work indices varying from a minimum of 11.1 to a maximum of 19.1.
  • The majority of the mineralization would be considered non-abrasive, with an average Abrasion Index of 0.0809. The mineralization type abrasion characteristics varied significantly from 0.0023 to 0.2872.
  • All of the Livengood mineralization types respond to cyanide leaching to some degree.
  • Some of the unoxidized mineralization with organic carbon has “active” or “pregrobbing” carbon.
  • The effect of leach times on gold recovery and gravity concentration results indicate some of the mineralization contains coarse gold.
  • Gold recovery at 10 mesh particle size on some of the mineralization types exceeded 90 percent.
  • Gold recovery on some of the mineralization types, but not all, is improved with finer grinding. A grind size where 80 percent (p80) of the particles are smaller than 200 mesh (74 microns) has been tested to date.
  • The leaching of flotation concentrates, in preliminary tests, shows variable results depending on the mineralization type and the amount of arsenopyrite present.
  • Fine grinding of flotation concentrates to less than 20 microns, in preliminary tests, does not significantly improve CIL gold recovery from this material.
  • Initial flotation and gravity concentration tests indicate the combined processes exceed 90% gold recovery to the concentrates.
  • The degree of oxidation of the mineralization, as observed by the geologists, has a marginal impact on the gold recovery.
  • Differences in gold recovery between cyanide shake leach tests, bottle roll leach tests, and Carbon-in-Leach tests suggest organic carbon in the mineralization is active to varying degrees in some of the mineralization types, particularly the un-oxidized portions of those mineralization types.
  • The gold is often associated with sulfides, but this mineralization would not be classified as a sulfide refractory type.

Resource Estimation

This report presents a global mineral resource estimate updated from the April 2011 estimate. The resource model was constructed using Gemcom GEMS® and the Stanford GSLIB (Geostatistical Software Library) MIK post processing routine. The resource was estimated using Multiple Indicator Kriging techniques.

Model parameters include, among others, two oxidation indicators and a single lithology indicator for each minor lithology. A three-dimensionally defined lithology model, based on interpretations by ITH geologists, was used to code the rock type block model. A three-dimensionally defined probability grade shell (0.1 g/t) was used to constrain the gold estimation. Gold contained within each block was estimated using nine indicator thresholds. The block model was tagged with the geologic model using a block majority coding method. Because there are significant grade discontinuities at lithologic contacts, hard boundaries were used between each of the lithologic units so that data for each lithology was used only for that unit.

A summary of the estimated global (in-situ) mineral resource is presented below for cutoff grades of 0.2, 0.3, 0.5, and 0.7 g/t gold.  Model validation checks include global bias check, visual validation, and swath plots. In all cases, the model appears to be unbiased and fairly represent the drilling data.

Model validation checks include global bias check, visual validation, and swath plots. In all cases, the model appears to be unbiased and fairly represent the drilling data.


Table 1:  Livengood Resources at 0.2 g/t gold cutoff

Gold Cutoff (g/t)
Tonnes (millions)
Gold (g/t)
Million Ounces Gold

Table 2: Livengood Resources at 0.3 g/t gold cutoff

Gold Cutoff (g/t)
Tonnes (millions)
Gold (g/t)
Million Ounces Gold

Table 3:  Livengood Resources at 0.5 g/t gold cutoff

Gold Cutoff (g/t)
Tonnes (millions)
Gold (g/t)
Million Ounces Gold

Table 4:  Livengood Resources at 0.7 g/t gold cutoff

Gold Cutoff (g/t)
Tonnes (millions)
Gold (g/t)
Million Ounces Gold

Based on the study herein reported, delineated mineralization of the Livengood Deposit is classified as a resource according to the following definitions from National Instrument 43-101 and from CIM (2005):

"In this Instrument, the terms "mineral resource", "inferred mineral resource", "indicated mineral resource" and "measured mineral resource" have the meanings ascribed to those terms by the Canadian Institute of Mining, Metallurgy and Petroleum, as the CIM Definition Standards on Mineral Resources and Mineral Reserves adopted by CIM Council, as those definitions may be amended."

Due to the uncertainty that may be attached to Inferred Mineral Resources, it cannot be assumed that all or any part of an Inferred Mineral Resource will be upgraded to an Indicated or Measured Mineral Resource as a result of continued exploration. Confidence in the estimate is insufficient to allow the meaningful application of technical and economic parameters or to enable an evaluation of economic viability worthy of public disclosure. Inferred Mineral Resources must be excluded from estimates forming the basis of feasibility or other economic studies.

Mineralization may be classified as an Indicated Mineral Resource by the Qualified Person when the nature, quality, quantity and distribution of data are such as to allow confident interpretation of the geological framework and to reasonably assume the continuity of mineralization. The Qualified Person must recognize the importance of the Indicated Mineral Resource category to the advancement of the feasibility of the project. An Indicated Mineral Resource estimate is of sufficient quality to support a Preliminary Feasibility Study which can serve as the basis for major development decisions.

The current basis of project information is not sufficient to convert the in-situ mineral resources to mineral reserves, and mineral resources that are not mineral reserves do not have demonstrated economic viability.

Economic testing of the global mineral resource has been performed using Whittle mine optimization to generate a surface mining shell defined at a long term gold price of $US 1,400 per ounce. Based on this mine optimization, the surface mining mineral resource at the Money Knob deposit is listed in the table below.

Surface Mine Mineral Resource defined at US $1,400 per Au ounce


Gold Cutoff (g/t)
Tonnes (millions)
Gold (g/t)
Million Ounces Gold


Mining Methods

The project configuration assumes a large scale surface mining operation using drill-blast-load-haul mining techniques. Major material handling was assumed to be based on hydraulic excavators with 34 cubic meter buckets and 220 tonne capacity haul trucks. Peak mining rates are 75 million tonnes of material, to sustain an annual throughput of 33.2 million tonnes of mineralized material at the processing plant. The total production rates in early years allow stockpiling of lower grade mineralized material to allow streaming of higher grade materials to the process plant.

The mine life is projected to be 23 years to support a mill throughput of 91,000 tonnes per day. Total mine production of mineralized material is projected to be 750 Mt with 892 Mt of overburden material.  The strip ratio would be 1.19 overburden material to mineralized material. The mineralized material would be comprised of measured, indicated and inferred classifications in the proportions of 60%, 24%, and 16%, respectively.

Initial pioneering for the surface mine is assumed to start with the initiation of construction at the site to provide borrow material for construction of the tail dam. Minor production of mineralized material would begin in the second year of construction, and then ramp up to deliver 22.5 Mtpa, 31.6 Mtpa and 32.6 Mtpa in production years 1, 2 and 3, respectively. Full capacity would be achieved in year 4.

Preliminary processing assumptions are based on a flow sheet that assumes a gravity gold circuit, followed by flotation to produce a concentrate. Gold would be recovered from the concentrate using carbon-in-leach cyanide leaching.

A single train plant is assumed with run-of-mine (ROM) mineralized material delivered to a primary gyratory crusher, which would feed a coarse stockpile. Coarse mineralized material would be reclaimed by apron feeders discharging onto a SAG mill feed conveyor. A grinding circuit would include a single SAG mill feeding two ball mills in parallel.

The ground, mineralized material would be routed through a gravity circuit producing a rougher concentrate, which would be cleaned to produce a gravity concentrate and gravity middlings. The gravity cleaner concentrate would be processed in a gold refinery to produce dore'. Gravity rougher tail would be returned to the grinding circuit, after a cyclone separation of the fine fraction which would go to flotation directly.

Ground mineralized material, after removal of the gravity recoverable gold, would go to a flotation cell where a rougher concentrate would be created, which combined with the gravity middlings would be reground and then leached in a CIL circuit to recover the contained gold. The CIL circuit would produce a loaded carbon which would be acid washed, stripped of gold and then reactivated for reuse. The refinery would use electrowinning to recover the gold, which would then be refined to produce a dore'.

The plant throughput would be controlled by the SAG milling capacity. Estimated gold recoveries have been based on the existing test work and industry experience, and varies between 58 -94 % for the different lithologies and oxidations.

Projected metallurgical recoveries for each lithologic unit have been estimated from the currently existing metallurgical test data. These estimates have been used as the basis of the mine optimization work, but have been increased by an additional 4 percentage points in the economic analysis to account for anticipated improvements that may be possible with further process optimization. Average recovery in the mine optimization output was 77.6%, but has been increased to 81.6% in the economic analysis.

This projected improvement in recovery is based on previous experience of the Qualified Person in process testing and plant optimization.

Project Infrastructure

Alaska infrastructure has been developed in a north-south corridor between ports on the south coast (Anchorage, Valdez and others) and Fairbanks in the center of the State. This includes communications, paved highways, railroad, railbelt electrical grid, and major airports. The metropolitan area around Fairbanks has a population of approximately 98,000 people.

The paved, all weather Elliot Highway runs north from Fairbanks to the North Slope oilfields at Prudhoe Bay, and passes within several kilometers of the Money Knob deposit. Communications infrastructure (fibreoptic) has been extended to the North Slope along the Alyeska Pipeline, which parallels the Elliot Highway and passes just west of Livengood.

In preliminary, nonbinding discussions, the local utility in Fairbanks (Golden Valley Electrical Association) has indicated that 80-100 MW of power could be available to the Livengood Project. Livengood would be connected to the local grid by building a 64 km 230- kVA line along the pipeline corridor. Environmental baseline studies required for the electrical line construction were begun in 2011.

The development of site layout plans is underway as part of the PFS. Primary infrastructure requiring construction at Livengood would be the process plant, tail pipeline, electrical line, mine shops and buildings, and site roads. Alternative sites have been investigated along the northern side of the ridge containing the Money Knob deposit for the process plant, overburden management facility and tail storage facility. A historical dam site, used to store water for placer mining operations, is being investigated for water storage.

Environmental Studies, Permitting and Social and Community Impacts

Based on review of the studies completed to date, there are no known environmental issues that are anticipated to materially impact the Project’s ability to extract the gold resource. ITH has been conducting environmental baseline studies at the Livengood Project since 2008. The environmental baseline programs conducted or currently underway at Livengood include:

  • surface water quality and hydrology; 
  • groundwater hydrogeology; 
  • wetlands extent and characteristics;
  • meteorology and air quality;
  • aquatic life and resources;
  • wildlife;
  • cultural resources;
  • and, rock geochemical characteristics.

A site-specific monitoring plan and water management plan for both operations and post mine closure will be developed in the future in conjunction with detailed engineering and Project permit planning.  Since development of the Project will require a number of Federal permits, the National Environmental Policy Act (NEPA) and Council of Environmental Quality (CEQ) Regulations 40 CFR parts 1500-1508 will govern the federal permitting portion of the Project. In fulfillment of the NEPA requirements, the project will be required to prepare an Environmental Impact Statement (EIS). Although at this time it is unknown which department will become the lead federal agency, the State of Alaska is expected to take a cooperating role to coordinate the NEPA review with the State permit process.

Capital and Operating Costs

Capital cost estimates have been developed from evaluation of the project configuration based on surface mining with a 91,000 tonne/day processing plant. International Tower Hill Mines Ltd. engaged MTB Project Management Professionals, Inc. to review capital cost that had been prepared in previous PEA estimates (Carew et al, 2010), make appropriate adjustments, prepare capital estimates, develop a work breakdown structure (WBS) for the capital cost, and develop an execution schedule for the capital expenditures, based on the scope of work as defined as of July 2011. Also, a sustaining capital cost estimate was to be prepared.

The capital cost scope was developed to a WBS. This WBS was developed from several historical projects of similar scope. The capital components of the estimate were allocated into two major groupings:

  • Initial capital
  • Sustaining capital cost for both incremental capital and replacement capital.

Costs were defined by the preproduction milestone schedule, with an approved feasibility study initiating the start of the capital cost being incurred; costs prior to the approved feasibility study were considered to be “sunk” costs. Initial capital cost was defined as all cost incurred before startup, which is when the first mineralized material is discharged into the primary crusher. Production year +1 begins at startup and defines operating cost.

The capital cost summary is as follows:

Initial Capital Cost………………………………………………………………… $1,614 million

LOM Sustaining Capital Cost……………………………………………………… $585 million

Contingency included in initial capital cost …………………….…………………..$323 million

Project operating costs are based on comparison to similar mining operations in Alaska and the USA.  The table below lists the operating cost assumptions used in the economic analysis.

Operating Area $/tonne processed $/tonne mined $/oz
Mining $3.87 $1.77 $218
Processing $6.81 - $395
Administration $0.81 - $47
Refining & Transportation $0.08 - $4.73
Reclamation $0.07 - $4.16
Royalty@ 2.5% $0.47 - $27.50
Total $12.12 -- --


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