Trevali Mining Corporation

Operations

Rosh Pinah

Namibia

Location

Underground

Mine Type

Zinc-lead-silver

Resource

90%

Ownership

Operations

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

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).

Rosh Pinah 2.0

Trevali had positive results from the independent Rosh Pinah Expansion “RP2.0” NI 43-101 Feasibility Study (“FS”) at its 90%-owned Rosh Pinah mine in Namibia. The FS is based on a scenario to expand the current throughput from 0.7 Mtpa to 1.3 Mtpa through the modification of the processing plant, construction of a paste fill plant, and development of a dedicated portal and ramp to the WF3 deposit. All figures are stated in United States dollars on a 100% ownership basis unless otherwise stated.

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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 December 31, 2021^{(1, 2, 4)}

		Grade			Metal
Category	Quantity	Zn	Pb	Ag	Zn	Pb	Ag
Category	Mt	%	%	g/t	M lbs	M lbs	K oz
Rosh Pinah Mine ⁽³⁾
Proven	7.50	5.64	1.29	20.10	933	213	4,844
Probable	9.25	5 .90	1.24	19.45	1,202	253	5,781
Proven & Probable	16.74	5.78	1.26	19.74	2,135	466	10,625

(1) All Mineral Reserves have been estimated in accordance with the CIM Definition Standards. Numbers may not add due to rounding. The Mineral Reserve is shown at 100% ownership, Trevali holds a 90% joint venture interest in the Rosh Pinah Mine.
(2) The technical report entitled “Rosh Pinah Expansion “RP2.0” NI 43-101 Feasibility Study” dated August 17, 2021, is the current technical report for the Rosh Pinah property.
(3) The Rosh Pinah Underground Mine Mineral Reserve estimate is reported based on planned stopes with a net smelter return cut-off grade of US$50/tonne, with average metal prices of: US$1.17/lb zinc, US$1.00/lb lead, US$24.13/oz silver.
(4) The Rosh Pinah Underground Mine Mineral Reserve estimate has been prepared by Trevali’s Technical group with an effective date of December 31, 2021, under the supervision of and approved by Yan Bourassa (P.Geo.), a Qualified Person as defined in NI 43-101. Mr. Bourassa is Vice President Technical Services & Exploration of the Company and accordingly, is not independent.

Rosh Pinah Mineral Resource as at December 31, 2021^{(1, 2, 4)}

		Grade			Metal
Category	Quantity	Zn	Pb	Ag	Zn	Pb	Ag
Category	Mt	%	%	g/t	M lbs	M lbs	K oz
Rosh Pinah Mine ⁽³⁾
Measured	10.84	7.34	1.87	28.30	1,755	447	9,865
Indicated	9.10	7.42	1.79	27.80	1,488	359	8,132
Measured & Indicated	19.94	7.38	1.83	27.71	3,244	805	17,764
Inferred	0.78	8.09	1.41	47.36	139	24	1,183

(1) All Mineral Resources have been estimated in accordance with the CIM Definition Standards. Mineral Resources are inclusive of Mineral Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. Numbers may not add up due to rounding. The Mineral Resource is shown at 100% ownership, Trevali holds a 90% joint venture interest in the Rosh Pinah Mine.
(2) The technical report entitled “Rosh Pinah Expansion “RP2.0” NI 43-101 Feasibility Study” dated August 17, 2021, is the current technical report for the Rosh Pinah property.
(3) The Rosh Pinah Underground Mine Mineral Resource estimate is reported based on zinc equivalent cut off grade of 4% ZnEQ.
(4) The Rosh Pinah Underground Mine Mineral Resource estimate has been prepared by the mine geology department with an effective date of December 31, 2021, under the supervision of and approved by Yan Bourassa (P.Geo.), a Qualified Person as defined in NI 43-101. Mr. Bourassa is Vice President Technical Services & Exploration of the Company and accordingly, is not independent.

Additional Resources

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Technical Report on Rosh Pinah Mine May 2018

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