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Namibia
Rosh Pinah Mine (Rosh Pinah Expansion Project)

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 Location:
0 km NE from Rosh Pinah, Namibia

  Address:

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

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
  • Lead
  • Silver
  • Gold
Mining Method
  • Sub-level stoping
  • Longhole open stoping
Processing
  • Dewatering
  • Flotation
Mine Life11 years (as of Jan 1, 2018)
Latest NewsTrevali Reports 2020 Mineral Reserves and Resources; Increasing Mineral Reserves at Rosh Pinah and Caribou Mines     March 31, 2021


Owners & OPERATOR

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 (RPZC), the Namibian incorporated (joint venture (JV)) company, which holds a 100% interest in the Property.

Deposit Type

  • SEDEX


Summary:

The Rosh Pinah mine is a reworked classic SEDEX type deposit comprising a primary banded sulphide exhalite, part of which was carbonatized with associated remobilization and enrichment of sulphides. The secondary carbonate ore carries the higher, economic, basemetal values.

The base metal sulphides at the Rosh Pinah mine are contained within the approximately 30 m thick ore equivalent horizon (OEH). In the Rosh Pinah mine area, the Rosh Pinah Formation has been shown to be at least 1,250 m thick.

The primary mineralization type at the Rosh Pinah mine is a silicified, grey to dark grey, finegrained and laminated unit locally called microquartzite mineralization. It consists of alternating millimetre to centimetre wide bands of sulphides (sphalerite, pyrite and galena + minor chalcopyrite) and is believed to represent a classic sedimentary-exhalative (SEDEX) style exhalite. The argillite mineralization at the Rosh Pinah mine would be similarly derived, but diluted with background benthonic argillite.

The mineralization occurs as breccia matrix and veins in silicified arenite lithologies (locally referred to as breccia mineralization) or as disseminated base-metal sulphides (locally referred to as arkose mineralization) and can reach economic grades. In places, the arkose/breccia mineralization gives indications of primary sulphide exhalations into an arenitic host. The breccia mineralization is commonly found in the immediate footwall to the ore horizon.

Carbonate mineralization is considered to be purely remobilized and provides the major economic component of the resource. Carbonate has replaced the arenites, both in the hanging wall and footwall of the ore horizon and a continuous range is observed from slightly carbonatic arenite (textures such as large, ghost feldspar grains occur) to pure carbonate, with all original textures lost. The carbonate has scavenged, concentrated, and remobilized base metal sulphides from the primary microquartzite mineralization. A near-total base metal enrichment of the carbonate mineralization gives rise to massive mineralization. When the carbonate has been leached out of the carbonate mineralization and the quartz grains and sulphides remain, the ore is locally referred to as sugary quartz mineralization.

The Rosh Pinah deposit is consequently presented as a series of discrete carbonate and exhalite lenses located on second-phase fold hinges or steeply plunging fold limbs connected by a partially attenuated exhalite- dominated ore-equivalent horizon.

The lenses have been separated into Primary, Secondary, and Tertiary classifications dependent upon their current materiality. The Rosh Pinah lens names are listed in Table 7-2 and are illustrated in Figures 7-5 and 7-6.

On average, WF3 comprises 7% arkose/breccia, 58% carbonate, and 36% microquartzite ore. It is graded from an arkose breccia dominated ore from section +90 to a carbonate dominated ore on section +210. From section +210 to +540, WF3 is almost exclusively composed of microquartzite and carbonate ore. Microquartzite ore becomes more dominant from section +330 further north. The average composition of WF3 from section +90 to +300 is 9% arkose/breccia, 68% carbonate, and 36% microquartzite ore. From +330 to +540 sections, it is made up of 2% arkose/breccia, 43% carbonate, and 55% microquartzite mineralization.

The WF3 deposit is interpreted to be a feeder zone consisting of numerous mineralized lenses with mostly secondary sphalerite and pyrite and is confined to the west by the Northern Fault. The mineralized lenses merge into singular lenses in some areas which is interpreted to be due to increased fluid activity.

The WF3 deposit generally dips northeast, striking northwest (325° to 145°) and almost midway through the deposit strike, the dip changes to southwest in the uppermost zones. Underground mapping of lithologies surrounding the orebody has revealed that WF3 is structurally controlled by shears zones and argillite bands. The ore zone contacts appear to be pervasively sheared in places probably due to the structural effects of the Northern Fault. Three faults are modelled and projected in place from the south composed of SF, SF1, and NF Splay striking parallel to the Northern Fault causing chlorotic schist in places. Microquartzites enveloping the ore have slightly undulating, graphitic, slickenside joint planes. The semi-tabular WF3 deposit has a highly irregular hanging wall dip and direction. Dip of the designed hanging wall varies from relatively flat to steep.


Mining Methods

  • Sub-level stoping
  • Longhole open stoping


Summary:

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.

The LHOS without backfill stopes are mined in a top-down sequence. Based on the ore width, access orientation, and the location of historical or planned voids, stopes are mined either transversely or longitudinally.

The longitudinal stopes are grouped on a level with a common access and only require a single slot with rings fired on retreat until the stope strike limits are reached.

Ore is sourced from five steeply-dipping zones, with an increasing proportion sourced from the western zones , as the eastern zone and southern-central zone are depleted.

Access to the production areas is via multiple interconnecting declines that provide fresh air intake into the mine.

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.

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 consistent zinc and lead feed grade to the mill. Blended ore is conveyed from the Krupp to a surface crusher. Low grade mineralization is trucked to an underground void dedicated for this material. Waste material is trucked to dedicated historical stope voids.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher ....................... Subscription required 66" 1
Cone crusher ....................... Subscription required 5.5' 1
Mobile jaw crusher 30" x 42" 1
Ball mill 12' x 12' 1000 kW 1
Regrind 185 kW 3
Regrind 90 kW 1

Summary:

The process plant includes crushing, screening, and grinding followed by lead/zinc flotation and filtering to produce separate lead and zinc concentrates.

The ROM ore is hauled from the underground production areas over a distance of approximately 4.2 km to the ore tipping location (Krupp) located some 320 m below surface. From the Krupp and primary crushing station, located underground, the ore is conveyed into the beneficiation plant through a series of conveyor belts for further crushing, screening, and grinding.

The ROM ore is fed through a grizzly to the primary jaw crusher at a rate of 140 tonnes per hour (tph) to 160 tph. The product is conveyed to the surface onto the primary screen where the oversize (+28 mm) is sent to the secondary cone crusher. Product from the crusher is sent back to the primary screen in closed circuit configuration. The undersize (-28 mm) from the primary screen is sent to the primary stockpile.

The secondary screen is fed from the primary stockpile at a rate of 100 tph to 110 tph. The oversize (+8 mm) is sent to the tertiary gyro-disc crusher. Crusher product is sent back to the secondary screen in closed circuit configuration. The undersize (-8 mm) from the secondary screen is sent to the mill feed stockpiles that act as a buffer between the milling and crushing circuit.

From the mill feed stockpiles, the ball mill is fed at a rate of 85 tph to 90 tph solids feed. The ball mill is a 1,000 kW Osborn ball mill measuring 12 ft by 12 ft.









.


Processing

  • Dewatering
  • Flotation

Flow Sheet: Subscription required

Summary:

The product from the milling circuit is sent to a conditioner where frother is added before it passes on to four rougher tank cells. The concentrate from the roughers is sent to the lead regrind circuit where it is ground to a P80 of 25 µm. The regrind circuit consists of a high rate thickener, three 18.5 kW stirred media detritors, and a product tank. The product from the regrind circuit is sent to a first cleaner bank cell. The concentrate from the cleaner bank cell is sent to the lead column cell and the tails is recycled back to the conditioner. The rougher tails go to two scavenger tank cells. Tails from the lead column cell are recycled back to the first cleaner and the final concentrate is sent to the lead concentrate thickener and belt filter for dewatering. The scavenger concentrates are also recycled back to the conditioner while the scavenger tails become the feed to the zinc circuit which first passes through two parallel intermediate thickeners. The main purpose of the int ........

Recoveries & Grades:

CommodityParameter2019201820172016201520142013
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, g/t 8.29.28.88.38.68.79.7
Zinc Concentrate Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Head Grade, g/t 1.311.41.71.82.11.8
Lead Concentrate Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, oz/t 0.60.522.834.836.74644
Silver Concentrate Grade, oz/t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 0.30.30.40.4
Gold Concentrate Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityProductUnits2019201820172016201520142013
Zinc Payable metal M lbs  ......  Subscription required9488769511186
Lead Payable metal M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt 1089781100104114
Lead Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Payable metal oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required627,295 t
Tonnes milled  ......  Subscription required641,980 t663 t560 kt699 kt707 kt
Daily milling capacity  ......  Subscription required2,000 t2,000 t
Annual mining rate  ......  Subscription required
Daily mining capacity  ......  Subscription required2,000 t of ore1,880 t of ore
Annual mining capacity  ......  Subscription required660,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 3.9 Mt Zinc 7.12 % 612 M lbs
Proven 3.9 Mt Lead 1.59 % 137 M lbs
Proven 3.9 Mt Silver 20.49 g/t 2,568 koz
Probable 4.59 Mt Zinc 6.4 % 648 M lbs
Probable 4.59 Mt Lead 1.46 % 148 M lbs
Probable 4.59 Mt Silver 23.11 g/t 3,409 koz
Proven & Probable 8.49 Mt Zinc 6.73 % 1,260 M lbs
Proven & Probable 8.49 Mt Lead 1.52 % 285 M lbs
Proven & Probable 8.49 Mt Silver 21.9 g/t 5,978 koz
Measured 5.49 Mt Zinc 8.33 % 1,009 M lbs
Measured 5.49 Mt Lead 1.93 % 234 M lbs
Measured 5.49 Mt Silver 27.14 g/t 4,792 koz
Indicated 5.83 Mt Zinc 7.3 % 938 M lbs
Indicated 5.83 Mt Lead 1.59 % 204 M lbs
Indicated 5.83 Mt Silver 25.18 g/t 4,716 koz
Measured & Indicated 11.32 Mt Zinc 7.82 % 1,950 M lbs
Measured & Indicated 11.32 Mt Lead 1.76 % 439 M lbs
Measured & Indicated 11.32 Mt Silver 26.13 g/t 9,509 koz
Inferred 5.56 Mt Zinc 7.11 % 872 M lbs
Inferred 5.56 Mt Lead 1.13 % 139 M lbs
Inferred 5.56 Mt Silver 24.93 g/t 4,457 koz

Commodity Production Costs:

CommodityUnits201920182017
All-in sustaining costs (AISC) Zinc USD  ......  Subscription required† 0.9 / lb† 0.85 / lb†
C1 cash costs Zinc USD  ......  Subscription required† 0.7 / lb† 0.47 / lb†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units201920182017
Total operating costs ($/t milled) USD 545956.1

Financials:

Units20192018
Sustaining costs M USD  ......  Subscription required19.5  
Revenue M USD  ......  Subscription required92  
EBIT M USD  ......  Subscription required-56.55  
EBITDA M USD  ......  Subscription required-38.56  
Subscription required - Subscription is required


Heavy Mobile Equipment as of May 1, 2018:
HME TypeModelQuantity
Drill ....................... Subscription required 2
Drill 4
Scoop Tram ....................... Subscription required 1
Scoop Tram ....................... Subscription required 4
Scoop Tram ....................... Subscription required 2
Truck (underground) ....................... Subscription required 8
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 4, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 4, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Technical Report 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Technical Report 2017
Year-end Mineral Reserves 2016
Subscription required - Subscription is required.

News:

NewsDate
Trevali Reports 2020 Mineral Reserves and Resources; Increasing Mineral Reserves at Rosh Pinah and Caribou Mines March 31, 2021
Trevali Prices Upsized C$30,000,000 Unit Offering November 25, 2020
Trevali Announces C$25,000,000 Overnight Marketed Public Offering of Units November 24, 2020
Trevali Announces Positive PFS For Rosh Pinah Mine Expansion (“RP2.0”); Increases Production Capacity by 86% and Significantly Reduces Operating Costs August 25, 2020
Trevali Reports 2019 Mineral Reserves and Resources; Increases Reserves at Rosh Pinah Mine and Grows Global Resource Base March 30, 2020

Aerial view:

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