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United States
Strong and Harris Project

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 Location:
85 km E from Tucson, Arizona, United States

  Project Contacts:
Concord Place, Suite 300 - 2999 North 44th Street
Phoenix
Arizona, United States
85018
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
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  • Overview
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  • Mining
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  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

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


Owners

Source: p. 21,23
CompanyInterestOwnership
Excelsior Mining Corp. 100 % Indirect
The Strong and Harris project is held by Excelsior through its wholly owned subsidiaries Excelsior Mining Arizona, Inc. (“Excelsior Arizona”) and Excelsior Mining Holdings, Inc. (“Excelsior Holdings”).
A total of 77 unpatented mining claims are held by Excelsior Holdings that cover 1,296 acres, and 36 unpatented mining claims are held by Excelsior Arizona that cover 612 acres.

Contractors

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Deposit Type

  • Skarn
  • Porphyry


Summary:

The Strong and Harris copper-zinc-silver deposit is a sub-type of or related to a classic copper skarn (Einaudi and Burt, 1982; and Meinert et al, 2005). Skarn deposits range in size from a few million to 500 million tonnes and are globally significant, particularly in the southwestern US. They can be stand-alone copper skarns, which are generally small, or can be spatially and temporally closely associated with porphyry copper deposits, in which case they tend to be very large. The skarn at Strong and Harris and collectively in the Cochise mining district is presumably related to the Texas Canyon Quartz Monzonite, despite the intrusive itself hosting very little known economic mineralization. Mineralization in the quartz monzonite would require more specialized conditions involving the metal and volatile content of the magma, depth of emplacement, or other factors (Burt, 1977).

Copper skarns generally form in calcareous shales, dolomites and limestones peripheral or adjacent to the margins of diorite to granite intrusions that range from dikes and sills, to large stocks or phases of batholithic intrusions, and frequently are associated with mineralized intrusions. Copper mineralizing hydrothermal fluids are focused along structurally complex and fractured rocks and convert the calcareous shales and limestones to andradite-rich garnet assemblages near the intrusive body, and to pyroxene and wollastonite rich assemblages at areas more distal to the intrusive. Retro ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The PEA presented in this report considers open-pit mining of the Strong and Harris project.

Road and Ramp Design
Road designs have been completed for the PEA to allow primary access for people, equipment, and consumables to the site. This includes haul roads between the designed pits, dumps, and proposed leach facility. Within the pit designs, ramps have been established for haul truck and equipment access. The in-pit ramps will only require a single berm. Ramps outside of the pit will require two safety berms. Onelane traffic ramps are also utilized near the bottom of pits where the strip ratio is minimal, and the traffic requirements are low.

The ramps and haul roads assume the use of CAT-777 haul trucks with an operating width of 20 feet. For two-way access the goal of the road design is to allow a running width of near 3.5 times the width of the trucks. MSHA regulations specify that safety berms be maintained at least ½ of the diameter of the tires of the haul trucks that will travel on roads. The ½ height of the CAT-777 haul trucks tires is 4.5 feet. An extra 10% was added to berm height design to ensure that all berms are sufficient in height.

Safety berms assume a slope of 1.5 horizontal to 1.0 vertical. Considering that ramps in the pit only need one berm, the road width of 85 feet was determined for two-lane traffic, which allows for 3.5 times the operating width of the haul trucks. Single-lane traffic roads are estimated to ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Copper M lbs 62437
Zinc M lbs  ......  Subscription required  ......  Subscription required
Copper Equivalent M lbs  ......  Subscription 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
Tonnes processed, LOM  ......  Subscription required
Annual processing rate  ......  Subscription required
* According to 2021 study.
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Reserves at September 9, 2021:
The project mineral resources are comprised of all model blocks at a 0.1 % Cu cutoff that lie within optimized resource pits.

CategoryTonnage CommodityGradeContained Metal
Inferred 76,161,000 tons Copper 0.52 % 794,049,000 lbs
Inferred 76,161,000 tons Zinc 0.56 % 858,425,000 lbs
Inferred 76,161,000 tons Silver 0.12 oz/ton 9,515,000 oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper Equivalent USD  ......  Subscription required&nbs
Assumed price Zinc USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
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Operating Costs:

Units2021
OP mining costs ($/ton mined) USD 2.5 *
OP mining costs ($/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
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 353.3
G&A costs $M USD 14.4
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $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 @ 8% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Proposed Heavy Mobile Equipment as of September 9, 2021:
HME TypeSizeQuantityLeased or
Contractor
Dozer 600 HP ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 9, 2021
....................... Subscription required ....................... Subscription required Subscription required Sep 9, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 28, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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