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United States
Hermosa (Taylor) Project

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 Location:
86 km S from Tucson, Arizona, United States

  Project Contacts:
2210 E Fort Lowell Road
Tucson
Arizona, United States
85719
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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Longhole open stoping
  • Paste backfill
Production Start...
Mine Life22 years (as of Jan 1, 2022)
The Hermosa project comprises the zinc-lead-silver sulphide deposit (Taylor Deposit), the zinc- manganese-silver oxide deposit (Clark Deposit) and the potential for further polymetallic and copper mineralisation. In January 2022, the Group announced the completed pre-feasibility study for the Taylor Deposit, its first development option at Hermosa.

Taylor feasibility study, construction of water plant two and shaft engineering work all commenced in FY22. The Taylor Deposit has progressed to a feasibility study, ahead of a planned final investment decision in mid-calendar year 2023.

Furthermore, a scoping study for the spatially linked Clark Deposit has confirmed the potential for a separate underground mining operation which may underpin a second development stage at Hermosa, with future studies to consider the opportunity to integrate its development with the Taylor Deposit.


Owners

Source: p. 2, 23
CompanyInterestOwnershipInvestor's Info
South32 Limited 100 % Indirect
Hermosa is a polymetallic development option located in Santa Cruz County, Arizona, and is 100% owned by South32. Title to the mineral rights is vested in South32’s wholly owned subsidiary Arizona Minerals Inc.

Contractors

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Deposit Type

  • Carbonate replacement
  • Manto
  • Skarn


Summary:

The Taylor Deposit is a carbonate replacement style zinc-lead-silver massive sulphide deposit. It is hosted in Permian carbonates of the Pennsylvanian Naco Group of south-eastern Arizona. The Taylor Deposit comprises the upper Taylor sulphide (Taylor Mains) and lower Taylor deeps (Taylor Deeps) domains that have a general northerly dip of 30° and are separated by a low angle thrust fault.

The Taylor Deposit has an approximate strike length of 2,500m and a width of 1,900m. The stacked profile of the thrusted host stratigraphy extends 1,200m from near-surface and is open at depth and laterally.

The regional geology is set within Lower-Permian carbonates, underlain by Cambrian sediments and Proterozoic granodiorites. The carbonates are unconformably overlain by Triassic to late-Cretaceous volcanic rocks. The regional structure and stratigraphy are a result of late-Precambrian to early-Palaeozoic rifting, subsequent widespread sedimentary aerial and shallow marine deposition through the Palaeozoic Era, followed by Mesozoic volcanism and late batholitic intrusions of the Laramide Orogeny. Mineral deposits associated with the Laramide Orogeny tend to align along regional NW structural trends.

Cretaceous-age intermediate and felsic volcanic and intrusive rocks cover much of the Hermosa project area and host low-grade disseminated silver mineralisation, epithermal veins and silicified breccia zones that have been the source of historic silver and lea ........


Mining Methods

  • Longhole open stoping
  • Paste backfill


Summary:

The design for Taylor is a dual shaft mine which prioritises early access to higher grade mineralisation, supporting ZnEq average grades of approximately 12%9 in the first five years of the mine plan. The proposed mining method, longhole open stoping, maximises productivity and enables a single stage ramp-up to our preferred development scenario of up to 4.3Mtpa. In the PFS schedule, shaft development is expected to commence in FY24 with first production targeted in FY27 and nameplate production in FY30.

Ore is expected to be mined in an optimised sequence concurrently across four independent mining areas, crushed underground and hoisted to the surface for processing. The mine design contemplates two shaft stations, one for logistics and access, and the other for material handling. The primary haulage material handling level is expected to be located at a depth of approximately 800m.

The operation would be largely resourced with a local owner-operator workforce.

The mining dilution is applied based on rock dilution or fill dilution dependent on the location of the stope being mined. Dilution factors are applied on a stope by stope basis using incremental dilution widths applied to the stope geometry.

The mining recovery factor is 95% and is applied to all ore tonnes.

Primary access to the orebody will be through a main shaft and a ventilation shaft. Ore passes, haulage levels and ventilation raises will be established to ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Zinc M lbs 2455,291
Lead M lbs  ......  Subscription required  ......  Subscription required
Silver M oz  ......  Subscription required  ......  Subscription required
Zinc Equivalent M lbs  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal.

Operational Metrics:

Metrics
Annual mining capacity  ......  Subscription required
Annual milling capacity  ......  Subscription required
* According to 2022 study.
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Reserves at June 30, 2021:
Cut-off grade Net smelter return in US$/t: UG Sulphide 80; UG Transition 80.

CategoryOreTypeTonnage CommodityGrade
Measured Sulphide 29 Mt Zinc 4.1 %
Measured Sulphide 29 Mt Lead 4.05 %
Measured Sulphide 29 Mt Silver 57 g/t
Indicated Sulphide 82 Mt Zinc 3.65 %
Indicated Transitional 3.7 Mt Zinc 6.11 %
Indicated Sulphide 82 Mt Lead 4.45 %
Indicated Transitional 3.7 Mt Lead 4.21 %
Indicated Sulphide 82 Mt Silver 88 g/t
Indicated Transitional 3.7 Mt Silver 60 g/t
Inferred Sulphide 23 Mt Zinc 3.62 %
Inferred Transitional 1.4 Mt Zinc 5.55 %
Inferred Sulphide 23 Mt Lead 3.82 %
Inferred Transitional 1.4 Mt Lead 3.91 %
Inferred Sulphide 23 Mt Silver 93 g/t
Inferred Transitional 1.4 Mt Silver 64 g/t
Total Resource Sulphide 133 Mt Zinc 3.74 %
Total Resource Transitional 5.1 Mt Zinc 5.95 %
Total Resource Sulphide 133 Mt Lead 4.26 %
Total Resource Transitional 5.1 Mt Lead 4.13 %
Total Resource Sulphide 133 Mt Silver 82 g/t
Total Resource Transitional 5.1 Mt Silver 61 g/t

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Zinc Equivalent USD  ......  Subscription required&nbs
Total cash costs Zinc Equivalent USD  ......  Subscription required&nbs
Total cash costs Zinc Equivalent USD  ......  Subscription required *†
All-in sustaining costs (AISC) Zinc Equivalent 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 ($/t milled) USD 35 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
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2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
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Proposed Heavy Mobile Equipment as of January 17, 2022:
HME Type
Drill (long hole)
....................... Subscription required
....................... Subscription required
....................... Subscription required
....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 17, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 17, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 17, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 17, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 17, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Corporate Presentation 2022
Corporate Presentation 2022
Pre-Feasibility Study Report 2022
................................... Subscription required 2021
................................... Subscription required 2019
Preliminary Economic Assessment 2018
Subscription required - Subscription is required.

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