Rosh Pinah Mine

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Location

Namibia

Ownership

90%

Mine Type

Underground Mine

Resource

Zinc-lead-silver

Operations

  • 2,000-tonne-per-day processing mill
  • Flotation recovery plant
  • Metallurgical and geochemical laboratories
  • Tailings facility
rosh_pinah

Rosh Pinah Mine

The Rosh Pinah underground zinc-lead mine and 2,000 tonne per day milling operation is located in southwestern Namibia, approximately 800 km south of Windhoek and 20 km north of the Orange River, at the edge of the Namib Desert. The Rosh Pinah mine has been in continuous operation since 1969 and currently produces zinc and lead sulphide concentrates containing minor amounts of copper, silver, and gold. The zinc and lead concentrates are transported by road to Luderitz, a port on the Namibian Coast, and then shipped to the international spot markets.

The Rosh Pinah mine is 90% owned by Trevali and 10% by Namibian Broad-Based Empowerment Groupings and an Employee Empowerment Participation Scheme (EEPS).

Geology and Mineralization

The Rosh Pinah Mine is hosted by the Rosh Pinah Formation (Hilda Subgroup of the Port Nolloth Group), forming part of the Neoproterozoic Gariep Terrane deposited onto a Palaeo-Mesoproterozoic basement of granite gneisses and supracrustals.

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

The primary mineralization type of economic interest at the Rosh Pinah Mine is a silicified, grey to dark grey, fine-grained and laminated unit locally called microquartzite mineralization. It consists of alternating millimetre to centimetre wide bands of sulphide exhalites (sphalerite, pyrite and galena + minor chalcopyrite), part of which was carbonatized with associated remobilization and enrichment of sulphides, and is believed to represent a classic reworked sedimentary-exhalative (SEDEX) style exhalite. The secondary argillite carbonate mineralization carries the higher, economic, base metal values. The argillite mineralization would be similarly derived, but diluted with background benthonic argillite.

Mineral Reserve and Mineral Resource Estimates

Rosh Pinah Mineral Reserves as at June 30, 2020


Grade Metal
Category Quantity Mt Zn % Pb % Ag g/t Zn M lbs Pb M lbs Ag K oz
Rosh Pinah Mine
Proven 4.24 7.32 1.99 23.7 684 186 3,221
Probable 6.99 5.62 0.93 16.2 866 143 3,671
Proven & Probable 11.23 6.26 1.33 19.0 1,550 329 6,892

CIM Definition Standards for Mineral Resources and Mineral Reserves (2014) were used for reporting of Mineral Reserves.
Mineral Reserves were estimated at an NSR cut-off value of US$50.0 per tonne.
The NSR values were calculated based on average metal prices of US$1.11/lb Zn, US$0.93/lb Pb, and US$19.81/oz Ag.
The average processing recoveries used were 88.0% for Zinc, 65.8% for Lead, and 43.5% for Silver.
Dilution (Inferred and unclassified material set to zero grade) assumed as a minimum of 1.0 m on each hangingwall and 0.5 m on each footwall.
Mining recovery factors assumed as a minimum of 95%.
Mineral Reserves are reported based on mined ore delivered to the plant as mill feed.
The average exchange rate used was N$ 16.69 = US$ 1.00.
Effective date of Mineral Reserves is 30 June 2020.
The QP for the Mineral Reserve estimate is Mr Andrew Hall, MAusIMM (CP), of AMC.
Rounding of some figures may lead to minor discrepancies in totals.
Mineral Reserves are stated on a 100% ownership basis. Trevali’s ownership interest is 90%.

Rosh Pinah Mineral Resource as at June 30, 2020


Grade Metal
Category Quantity Mt Zn % Pb % Ag g/t Zn M lbs Pb M lbs Ag K oz
Rosh Pinah Mine
Measured 8.13 7.38 2.11 25.7 1,323 378 6,727
Indicated 7.97 7.08 1.22 19.8 1,245 215 5,082
Measured & Indicated 16.10 7.23 1.67 22.8 2,567 593 11,809
Inferred 3.43 6.71 1.34 23.2 508 102 2,557

CIM Definition Standards for Mineral Resources and Mineral Reserves (2014) were used for reporting of Mineral Resources.
The Mineral Resources are stated inclusive of Mineral Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic value.
Mineral Resources are reported at an ZnEq cut-off grade of 4.0%Zn which approximates a Net Smelter Return (NSR) value of $40/t. Zinc equivalency was estimated as ZnEq = Zn (%) + Pb (%) + [Ag (g/t) * 0.028)].
Effective date of Mineral Resources is 30 June 2020.
The QP for the Mineral Resource estimate is Mr Rodney Webster, MAIG, of AMC.
Mineral Resources are stated on a 100% ownership basis. Trevali’s ownership interest is 90%.