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United States
Johnson Camp Mine

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 Location:
8 km NW from Dragoon, Arizona, United States

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

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Overview

StageRestarting
Mine TypeOpen Pit
Commodities
  • Copper
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life5 years (as of Jan 1, 2022)
The Johnson Camp mine contains two open pit mines, the Burro pit and the Copper Chief pit.

Excelsior Mining Corp. is planning to restart the Johnson Camp copper open pits to supplement copper production. Permitting of the new leach pad necessary to restart operations is in progress.
Latest NewsExcelsior Mining Announces Updated Preliminary Economic Assessment on Johnson Camp Mine Incorporating Sulfide Leaching Technology     February 22, 2023


Owners

Source: p. 265
CompanyInterestOwnership
Excelsior Mining Corp. 100 % Indirect
Excelsior Mining Arizona, Inc. (operator) 100 % Direct
The Project is held by Excelsior through its wholly owned subsidiaries Excelsior Mining Arizona, Inc. (Excelsior Arizona) and Excelsior Mining JCM, Inc.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Skarn


Summary:

The Johnson Camp Mine copper deposit is a type of copper skarn. The copper skarn at Johnson Camp and collectively in the Cochise mining district is presumably related to the Texas Canyon Quartz Monzonite. 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 mineralization forms 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 that are subject to retrograde alteration with mineral hydrated silicate assemblages that overprint earlier garnet and pyroxene.

Mineralization at Johnson Camp occurs approximately 500 ft northeast of known occurrences of the Texas Canyon Quartz Monzonite intrusion as proximal skarn related to a porphyry copper system. This assumption is supported by the high abundance of garnet-epidote alteration in the mineralized zones, and the characterization of the deposits in numerous historical publications.

The Johnson Camp Mine is located within the Mexican Highland region of the Basin and Range province, which is characterized by fault-bounded mountain ranges, with large intrusions forming the cores of t ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Johnson Camp Mine plan f has been developed with the expectation that it will produce leachable copper material and provide cash flow while the Gunnison Copper Project improvements (water treatment plant, new wells) are being constructed. This mine plan targets a small tonnage, higher grade portion of the Burro deposit that is planned to be mined over a 3.5-year period. A contract miner will be selected for executing the mining portion of the Project because of the short duration of the mine plan.

Mining of the deposit is expected to be accomplished with 100-ton haul trucks and front-end loaders. Mining is planned on 20-ft bench heights. The pit configuration is double benched with catch benches every vertical 40 ft.

Pit slope angles are based on observed pit wall angles in the existing Burro pit. A 45-degree inter ramp pit slope angle was chosen for the phase design utilizing 63-degree bench face angles with a 20 ft wide catch bench every 40 ft vertical. The southwest wall of the pit was designed at the angle of the lithology bedding. This results in a 32–40- degree overall pit slope on the southwest wall of the pit. The portion of the pit that mines through existing waste dumps at the top of the NE wall is designed at a 37-degree slope angle with a 50 ft step out at the toe of fill material.

The other parameters used for the phase designs were:
Bench Height: 20 ft (double-benched);
Haul Road Width: 82 ft;
Step out at toe ........


Crushing and Grinding

Crushing has been done at Johnson Camp, and the original crushing plant could be reactivated after repairing and upgrading primary and secondary crushers and screens.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsLOM
Copper k lbs 65,964
All production numbers are expressed as cathode.

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
Annual production capacity  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

Reserves at February 21, 2022:
Mineral Resources cut-off grade 0.2% TCu.

CategoryTonnage CommodityGradeContained Metal
Inferred 61,529,000 tons Copper 0.38 % 472,167,000 lbs

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper USD  ......  Subscription required&nbs
Total cash costs Copper USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2022
G&A ($/ton milled) USD 0.03 *
* According to 2022 study.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 73.4
Total OpEx $M USD  ......  Subscription required
Pre-tax NPV @ 7.5% $M USD  ......  Subscription required
After-tax NPV @ 7.5% $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 March 11, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer ....................... Subscription required 410 HP ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... 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 Nov 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 18, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Management Discussion & Analysis 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
Other 2018
Financial Review 2017
Annual Information Form 2016
Feasibility Study Report 2016
Other 2016
Form 10-K 2012
Technical Report 2007
Subscription required - Subscription is required.

News:

NewsDate
Excelsior Mining Announces Updated Preliminary Economic Assessment on Johnson Camp Mine Incorporating Sulfide Leaching Technology February 22, 2023

Subscription required - Subscription is required.

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