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Namibia
Rosh Pinah Expansion Project (Rosh Pinah)

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 Location:
0 km NE from Rosh Pinah, Namibia

  Project Contacts:

Rosh Pinah
Namibia
Phone  ...  Subscription required
Fax+264-63-274-209
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageFeasibility
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Paste backfill
Production Start...
Mine Life12 years (as of Jan 1, 2021)


Owners

Source: p. 2
CompanyInterestOwnership
Trevali Mining Corp. 90 % Indirect
Rosh Pinah Zinc Corporation (Pty) Ltd. (operator) 100 % Direct
Trevali holds a 90% interest in, and is operationally responsible for, Rosh Pinah Zinc Corporation (Pty) Ltd, the Namibian incorporated (joint venture) company, which holds a 100% interest in the Property. The remaining 10% is owned by Namibian Broad-Based Empowerment Groupings and an EEPS.

Contractors

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Deposit Type

  • SEDEX
  • VMS


Summary:

Deposit types
The Rosh Pinah mine has been historically interpreted as being predominantly a reworked SEDEX type deposit comprising a primary banded sulphide exhalite, part of which was carbonatized with associated remobilization and enrichment of sulphides. The secondary carbonate mineralization carries the higher, economic, base-metal values.

The emplacement of the Spitskop Volcanic Complex and related mafic edifices at approximately 752 Ma to 741 Ma drove hydrothermal plumbing along the rift-fault system of the Rosh Pinah Graben. Hydrothermal fluids leached base metals from the basin-fill siliciclastics which were derived mainly from the erosion of a Paleoproterozoic, 2.0 Ga to 1.7 Ga, calcalkaline island arc in the hinterland (Frimmel et al. 2004).

The base-metal bearing brines were exhaled onto the sea floor from the present-day Western Fault bounding the Rosh Pinah Graben, during a period of sediment paucity and / or high sea-level. Exhalation was accompanied by silicification and hydraulic brecciation of the footwall. The primary mineralization was deposited at, or below, the sediment / seawater interface as stratiform, inter-banded, massive sulphide and cherty argillite (micro quartzite). Time between exhalative pulses determined the variation in ratio of content, of chert- exhalite and background argillitic sediment.

At some stage following primary SEDEX style mineralization deposition, the hydrothermal fluid chemistry change ........


Mining Methods

  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse open stoping
  • Paste backfill


Summary:

Current mining method
Rosh Pinah is an existing operating underground mine with well-established mining methods. The current mining method is LHOS without backfill using a Primary, Secondary, and Tertiary top-down extraction sequence. Mining using this LHOS method since 1969 has resulted in significant voids within the historical and currently mined zones.

Ore is sourced from six steeply-dipping zones, with an increasing proportion sourced from the WF3 and AAB zones, as the eastern zone (EOF) and southern-central zone (SF3, SF3, and BME) are depleted.

Access to the production areas is via multiple interconnecting declines that provide fresh air intake into the mine. A new independent decline from surface to the WF3 zone is proposed.

The current mining areas use a LHOS Primary / Secondary extraction sequence with no backfill, except for WF3, which uses a LHOS Primary / Secondary / Tertiary extraction sequence with no backfill.

The current mining fleet consists of mechanized mobile and ancillary fleet including development jumbos, production drills, loaders and 30 t trucks for haulage to an underground crushing and conveying system (notionally called the Krupp). Future plans include the use of 60 t trucks to haul WF3 material directly to surface.

Current ore haulage is via a decline to the Krupp tip point comprising three ore silos in which to tip. Blending of the ore is conducted using the ore silos to maintain a cons ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Zinc M lbs 1351,307
Lead M lbs  ......  Subscription required  ......  Subscription required
Silver koz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as payable metal.

Operational Metrics:

Metrics
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at March 31, 2021:
Mineral Reserves were estimated at a full breakeven NSR cut-off value of US$50 per tonne. NSR values were calculated based on average metal prices of US$1.17/lb Zn, US$0.96/lb Pb, and US$24.47/oz Ag.
Mineral Resources are reported at an ZnEq cut-off grade of 4.0% which approximates a Net Smelter Return value of US$40/t.

CategoryTonnage CommodityGradeContained Metal
Proven 6.14 Mt Zinc 6.26 % 384 kt
Proven 6.14 Mt Lead 1.5 % 92 kt
Proven 6.14 Mt Silver 18.8 g/t 3,713 koz
Probable 6.21 Mt Zinc 6.55 % 407 kt
Probable 6.21 Mt Lead 1.22 % 76 kt
Probable 6.21 Mt Silver 20.8 g/t 4,145 koz
Proven & Probable 12.35 Mt Zinc 6.41 % 791 kt
Proven & Probable 12.35 Mt Lead 1.36 % 168 kt
Proven & Probable 12.35 Mt Silver 19.8 g/t 7,858 koz
Measured 10.54 Mt Zinc 7.41 %
Measured 10.54 Mt Lead 2.04 %
Measured 10.54 Mt Silver 27.4 g/t
Measured 10.54 Mt Zinc Equivalent 10.22 %
Indicated 7.92 Mt Zinc 7.48 %
Indicated 7.92 Mt Lead 1.46 %
Indicated 7.92 Mt Silver 23.8 g/t
Indicated 7.92 Mt Zinc Equivalent 9.6 %
Measured & Indicated 18.46 Mt Zinc 7.44 %
Measured & Indicated 18.46 Mt Lead 1.79 %
Measured & Indicated 18.46 Mt Silver 25.8 g/t
Measured & Indicated 18.46 Mt Zinc Equivalent 9.96 %
Inferred 1.58 Mt Zinc 8.31 %
Inferred 1.58 Mt Lead 2.19 %
Inferred 1.58 Mt Silver 54.9 g/t
Inferred 1.58 Mt Zinc Equivalent 12.04 %

Commodity Production Costs:

CommodityUnitsAverage
Total 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 2021 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2021
UG mining costs ($/t milled) USD 27.1 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Expansion CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 129.8
G&A costs $M USD 78
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 @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of March 31, 2021:
HME TypeModelSizeQuantity
Drill ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

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

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