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United States
Long Valley Project

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 Location:
13 km E from Mammoth Lakes, California, United States

  Project Contacts:
Suite 970 – 1055 West Hastings Street
Vancouver
British Columbia, Canada
V6E 3E9
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life7 years (as of Jan 1, 2021)


Owners

Source: p. 25
CompanyInterestOwnership
KORE Mining Ltd. 100 % Indirect
The Long Valley project is held 100% by KORE’s wholly-owned subsidiary KORE USA Ltd. The project is focused on the Long Valley gold deposit, which is also known as the Inyo gold deposit.

Contractors

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Deposit Type

  • Epithermal
  • Volcanic hosted


Summary:

DEPOSIT TYPE
The mineralization identified at the Long Valley property is typical of the shallower portions of an epithermal, low-sulfidation type of gold-silver deposit. Other examples of this type of deposit, which share some similarities to Long Valley, include the McLaughlin deposit in California and the Hycroft (Sulfur) deposit in Nevada. In common with these deposits, gold and silver mineralization appears to have taken place at very shallow depths and is associated with a relatively recent volcanic-related hydrothermal system. In addition, the mineralized zones are typically associated with clay alteration (kaolinite) and silica replacement of volcaniclastic host rocks. This type of deposit typically contains very low amounts of base metals.

Mineralization
Several areas or zones on the Long Valley property are known to be mineralized with low grades of gold and silver. These areas are known as the North, Middle (also called Central), South, Southeast, and Hilton Creek areas. Based on drilling, mineralization appears to generally be contiguous between the South, Southeast, and Hilton Creek zones. These same zones appear to contain the vast majority of the estimated mineral resources described later in this report. Drilling is widely spaced in and between the North, Middle, and South zones, and it may be possible that with additional drilling, these zones may be shown to be contiguous with the better-defined zones to the south.

The princi ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Long Valley Project is planned to be mined using conventional open pit mining methods. The ore and waste will be drilled and blasted using a rotary blasthole drill and ammonium nitrate fuel oil (ANFO) and transported in dump trucks. The mine plan calls for the leachable material from the pits to the heap leach pad at a rate of 22,000 short tons per day. The mine plan includes concurrent backfilling and closure within +/-25 feet of original topography.

Pit Design
For the Long Valley project, average mining cost and G&A cost from similar deposits were used as a basis for Whittle costs. Processing costs used in the Whittle pit analysis were specifically evaluated for the Long Valley deposit.

The ultimate pit consists of two separate pits, a larger pit and smaller satellite pit. The primary pit is divided into 3 phases with similar quantity of material, and the smaller satellite pit is considered as a separate 4th phase.

Within the phases, pits were designed with an overall pit slope of 45°, using a batter angle of 80°, bench height of 20 feet (doubled 10 feet benches). Catch berms are 16 feet wide. All in-pit haul roads were designed with a maximum 10% grade and a width of 90 feet.

Mine Scheduling
The resources were reported by 10-foot bench, showing tons of leachable material, waste, and ounces of gold. Pre-stripping of waste was included if waste occurred on a bench that had no corresponding leachable material or if th ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 102717
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Daily processing rate  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at September 21, 2020:
Variable cut-off grade Oxide-0.005 oz/ton, Transition-0.006 oz/ton, Sulfide-0.006 oz/ton.

CategoryTonnage CommodityGradeContained Metal
Indicated 70,216 k tons Gold 0.017 oz/ton 1,217 koz
Inferred 24,307 k tons Gold 0.019 oz/ton 453 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
OP mining costs ($/ton mined) USD 1.88 *
OP mining costs ($/ton milled) USD  ......  Subscription required
Processing costs ($/ton milled) USD  ......  Subscription required
G&A ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $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 131.6
G&A costs $M USD 37.9
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
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
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
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Water Supply

Heap operation over the estimated mine life indicates that operation of the HLF requires a water supply with an approximate average flowrate of 450 gpm (100 m3/hr). An additional 150 gpm (34 m3/hr) is required for mine, shop, and office water consumption.


Proposed Heavy Mobile Equipment as of June 7, 2021:
HME TypeModelQuantity
ANFO Loader ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 7, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 7, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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