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United States
Kilgore Project

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 Location:
9 km NW from Kilgore, Idaho, United States

  Project Contacts:
10 King Street East, Suite 200
Toronto
Ontario, Canada
M5C 1C3
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life5 years (as of Jan 1, 2019)
Excellon Idaho Gold has completed the first of several seasons of its field exploration for potential additional mineralized zones at the historic Kilgore gold deposit in Clark County, Idaho.


Owners

Source: p. 9
CompanyInterestOwnership
Excellon Resources Inc. 100 % Indirect

Contractors

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Deposit Type

  • Epithermal


Summary:

The Kilgore deposit is a zoned, low sulfidation (LS) epithermal hot spring precious metals (Au, silver [Ag]) deposit the result of caldera-related volcanic activity. These deposits are commonly bulk-tonnage, lowgrade, and amenable to open-pit mining. Numerous scientific articles have been written and published on this deposit type concerning its origins, physical, chemical, and geological settings, recognition criteria, major- and trace-element geochemistry, zoning, alteration types, ore mineralogy, ore grades and distribution of ore, and mining characteristics. Models are described in papers by Buchanan (1981), Silberman (1982), and Berger (1985), among others, and the reader is referred to these for more information on the subject.

Gold mineralization at Kilgore occurs within two suites of receptive host rocks: 1) in rocks of volcanic or subvolcanic origin, including the Tlt, Tap, and the sub-vertical granitoid dikes, dike swarms, and granite to granodioritic bodies that intrude it, and 2) the sedimentary turbidites composed of arkosic sandstones and siltstones, and carbonaceous shales of the Aspen Formation.

Gold mineralization in the volcanic and related intrusive rocks contains high grade zones as a result of weak to moderate vein development and open space fracture-fill, together within a broad, low grade halo of disseminated gold within variably silicified and argillically altered rocks. Gold content appears to decrease rapidly to lower grades (l ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Conventional open pit mining methods using drill, blast, load, and haul mining are applicable to the Kilgore deposit.

The PEA evaluated pits that were generated excluding the Aspen material and pits that were generated including the Aspen material. Based on review of metallurgical test work of the Aspen Formation, which shows variable recovery for different zones, GRE assumed 60% of the Aspen material would be leachable, while the other 40% was considered waste. Similarly, 60% of the reported gold ounces within the Aspen rock type were included as contained ounces and the other 40% were considered waste. GRE recommends additional geologic analysis of the Aspen Formation to identify and model the good- performing metallurgical domain relative to the portion that requires CIL or CIP processing efforts.

GRE evaluated two leaching options for each of the ultimate pit designs:

- crushing of all material above the mining cutoff grade;

- a combination of run-of-mine (ROM) and crushing:
- ROM of all material above a cutoff grade of 0.004 opt (0.14 g/T) up to the mining cutover grade;
- crushing of all material above the mining cutover grade.

Each pit was evaluated at five mining cut-off grades: 0.006 opt (0.2057 g/T), 0.007 opt (0.24 g/T), 0.008 opt (0.274 g/T), and 0.009 opt (0.309 g/T), and 0.010 opt (0.343 g/T).

The Kilgore deposit includes potentially recoverable silver content as well as gold. Silver a ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Metal in doré oz 111,700558,700
Gold Metal in ore oz 752,200

Operational Metrics:

Metrics
Stripping / waste ratio 1.1 *
Daily ore mining rate 15,000 tons *
Waste tonnes, LOM 60 M tons *
Ore tonnes mined, LOM 54.1 M tons *
Total tonnes mined, LOM 114.02 M tons *
* According to 2019 study.

Reserves at August 26, 2019:
Gold resources are reported above a 0.21 g/t Au (0.006 opt) cutoff.

CategoryTonnage CommodityGradeContained Metal
Indicated 49,106,000 tons Gold 0.017 oz/ton 825,000 oz
Inferred 10,354,700 tons Gold 0.013 oz/ton 136,000 oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs
All-in costs Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2019 study / presentation.

Operating Costs:

Units2019
OP mining costs ($/ton mined) USD 2.32 *
Processing costs ($/ton milled) USD  ......  Subscription required
G&A ($/ton mined) USD  ......  Subscription required
* According to 2019 study.
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2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 156.8
G&A costs $M USD 13.8
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Net 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 @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 7% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 7% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Water Supply

Modeling of the heap operation on a monthly basis over the projected mine life indicates that operation of the HLF requires a water supply with an approximate average flowrate of 259 gpm (59 m3/hr). An additional 88 gpm (20 m3/hr) is required for mine, shop, and office water consumption.


Proposed Heavy Mobile Equipment as of August 26, 2019:
HME TypeModelSizeLeased or
Contractor
Loader ....................... Subscription required 16 cu. yd Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 30, 2019
....................... Subscription required ....................... Subscription required Subscription required Jul 30, 2019
....................... Subscription required ....................... Subscription required Subscription required Feb 20, 2023
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Corporate Filings & Presentations:

DocumentYear
Management Discussion & Analysis 2022
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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