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United States
Bunker Hill Mine

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 Location:
50 km SE from Coeur d'Alene, Idaho, United States

  Project Contacts:
1 Mine Road
Kellogg
Idaho, United States
83837
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Overview

StageRestarting
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Overhand Cut & Fill
  • Longhole open stoping
  • Hydraulic backfill
Production Start...
Mine Life5 years (as of Jan 1, 2022)
Bunker Hill Mining Corp. is pleased to report that it has completed the underground development ‘breakthrough’ to the 6 Level of the mine, the demolition of the old maintenance shop in preparation for mill construction (processing facility configured initially for 1,800 tons per day but with the capacity to increase throughput to 2,100 tons per day), and remains on track and on budget for a restart of the mine in the fourth quarter of 2023.
Latest NewsBunker Hill Achieves Underground Development Milestone, Ensuring Upper Levels of Mine Ready For Mechanized Mining     December 13, 2022


Owners

Source: p. 15
CompanyInterestOwnership
Bunker Hill Mining Corp. 100 % Indirect
Bunker Hill mine is 100% owned by Silver Valley Metals Corporation, a wholly owned subsidiary of Bunker Hill Mining Corp.

Contractors

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Deposit Type

  • Orogenic
  • Vein / narrow vein


Summary:

In the most general sense, deposits in the District are orogenic, polymetallic veins with lesser disseminated mineralization emanating from the principal veins.

The Bunker Hill Mine workings extend 8,600 feet along strike of the overturned beds of the Upper Revett formation that host the mineralization, extending 7,000 feet downdip parallel to the axial plane of the plunging anticline, covering 5,200 vertical feet from ~3,500 ft msl to -1,700 ft msl. More than 30 individually named deposits were mined historically in separate stopes, with two distinct types of deposits exploited: tabular Bluebird (BB) zones that parallel bedding and are associated with the fold structures, and later Galena-Quartz (GQ) Veins cutting through bedding with sharp walls. The Bluebird Deposits, such as the March, have been mined for up to 1,400 ft along strike, 4,000 ft downdip, covering 2,400 ft in elevation, with thicknesses of the generally tabular zones up to 150 ft. GalenaQuartz Veins were historically mined along strike lengths of up to 800 ft, and downdip up to 3,700 ft, with mined thicknesses from 5-15 ft.

Mineralization at Bunker Hill falls in four categories, described below from oldest to youngest events:

- Bluebird Veins (“BB”): W--NW striking, SW-dipping, variable ratio of sphalerite-pyrite-siderite mineralization. Thick, tabular cores with gradational margins bleeding out along bedding and fractures;

- Stringer/Disseminated Zones: Disseminat ........


Mining Methods

  • Overhand Cut & Fill
  • Longhole open stoping
  • Hydraulic backfill


Summary:

Long-hole stoping with fill (LHOS), cut-and-fill and possibly room-and-pillar mining with fill are the only methods viable for sustained operations today. LHOS is the preferred mining method with limited cut-and-fill mining at Bunker HIll. Room-and-pillar mining is not in the current plan.

LONG-HOLE OPEN STOPING WITH HYDRAULIC FILL
Long-hole open stoping (LHOS) is employed with engineered hydraulic fill. Long-hole panels are established by driving a top cut and bottom cut into the mineralized zone leaving a bench between the upper and lower cuts. This bench is then extracted utilizing the top cut as drilling and loading access and the lower cut for mucking access. LHOS are typically mucked with remote control equipment for safety. Stope centerlines are laid out and designated as alternating primary and secondary excavations. The primary stopes are taken first with native rock on all sides. As they are mined-out, they are filled with an engineered hydraulic backfill. The secondary stopes are then mined out adjacent to the primary backfill. The fill strength requirements for secondary stopes are typically much less as they are the last excavations taken in an area. Secondary stopes are typically filled with development material and low or zero cement content hydraulic fill. LHOS represents over 97% of the reserve tons. Planned dilution is included in the stope shapes and defined as M & I material below the cut-off value. External dilution is included at 5% for ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Zinc Concentrate kt 48248
Zinc Metal in concentrate M lbs 62317
Lead Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Silver Metal in lead concentrate koz  ......  Subscription required  ......  Subscription required
Zinc Equivalent Metal in concentrate k lbs  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics
Daily ore mining rate  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Annual processing rate  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2022 study.
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Reserves at August 29, 2022:
Mineral resources are estimated at a cutoff of 3.3% Pb and 3.3 % Zn.

CategoryTonnage CommodityGradeContained Metal
Probable 3,360 k tons Zinc 5.3 % 186,060 k lbs
Probable 3,360 k tons Lead 2.4 % 82,992 k lbs
Probable 3,360 k tons Silver 1.02 oz/ton 3,587 koz
Measured & Indicated 7,036 k tons Zinc 5.44 % 765,774 k lbs
Measured & Indicated 7,036 k tons Lead 2.4 % 337,869 k lbs
Measured & Indicated 7,036 k tons Silver 1 oz/ton 7,061 koz
Inferred 6,943 k tons Zinc 4.96 % 688,482 k lbs
Inferred 6,943 k tons Lead 2.87 % 398,901 k lbs
Inferred 6,943 k tons Silver 1.52 oz/ton 10,532 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Zinc USD  ......  Subscription required *†
All-in sustaining costs (AISC) Zinc USD  ......  Subscription required *†
Assumed price Lead USD  ......  Subscription required&nbs
Assumed price Zinc USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
† Net of By-Product.
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Operating Costs:

Units2022
UG mining costs ($/ton milled) USD 37 *
Processing costs ($/ton milled) USD  ......  Subscription required
G&A ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 69.3
Refining and transportation $M USD  ......  Subscription required
G&A costs $M USD 28.5
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 5% $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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Heavy Mobile Equipment:
HME TypeModelSizeQuantityStatusLeased or
Contractor
Ref. Date
Bolter ....................... Subscription required Proposed Aug 29, 2022
....................... Subscription required ....................... Subscription required Proposed Aug 29, 2022
Jumbo 12 ft ....................... Subscription required Existing Oct 5, 2022
....................... Subscription required ....................... Subscription required Proposed Aug 29, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased Aug 29, 2022
....................... Subscription required ....................... Subscription required Proposed Aug 29, 2022
....................... Subscription required ....................... Subscription required Proposed Sep 20, 2021
....................... Subscription required ....................... Subscription required Proposed Aug 29, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased Aug 29, 2022
....................... Subscription required ....................... Subscription required Proposed Aug 29, 2022
Truck (underground) ....................... Subscription required 16 t ....................... Subscription required Existing Oct 5, 2022
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 1, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Corporate Presentation 2022
Pre-Feasibility Study Report 2022
Press Release 2022
Press Release 2022
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
Subscription required - Subscription is required.

News:

NewsDate
Bunker Hill Achieves Underground Development Milestone, Ensuring Upper Levels of Mine Ready For Mechanized Mining December 13, 2022

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