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Operations

Rosh Pinah Zinc Mine

Location

Namibia

Ownership

80.08%

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 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 80.08% owned by Trevali and 19.92% 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 December 31, 2017(1, 2)
 
  

Grade

Contained Metal

Reserve Category

Million tonnes

Zn %

Pb %

Ag g/t

Zn M lbs

Pb M lbs

Ag K oz

Proven

2.66

9.07

1.32

18.20

531.5

77.4

1,553

Probable

5.08

6.84

1.43

20.30

767.2

160.1

3,323

Proven & Probable

7.74

7.61

1.39

19.60

1,298.7

237.4

4,876

(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 an 80% joint venture interest in the Rosh Pinah mine.

(2) The Rosh Pinah Underground Mine mineral reserve estimate is reported based on planned stopes with an net smelter return cut-off-value of US$66/tonne and incremental stopes greater than US$34/tonne, metal prices of: US$1.16/lb zinc, US$1.00/lb lead, US$18.18/oz silver, FX: NAD/US$ 13.30. The Rosh Pinah Underground Mine mineral reserve has been prepared by the mine engineering department of the Company with an effective date of December 31, 2017 and has been reviewed and approved by Professional Engineer Torben Jensen (P.Eng.), a consultant with Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101 and will be detailed in the technical report entitled “Technical Report on the Rosh Pinah Mine, Namibia” to be dated April 10, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days.

Rosh Pinah Mineral Resources as at December 31, 2017(1, 2)
  

Grade

Contained Metal

Resource Category

Million tonnes

Zn %

Pb %

Ag g/t

Zn M lbs

Pb M lbs

Ag K oz

Measured

4.37

8.49

1.85

26.60

817.3

177.9

3,738

Indicated

6.40

7.28

1.54

24.10

1,026.7

217.2

4,964

Measured & Indicated

10.76

7.78

1.67

25.20

1,843.9

395.1

8,702

Inferred

3.00

6.50

1.10

30.60

429.9

75.0

2,951

(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 an 80% joint venture interest in the Rosh Pinah mine.

(2) The Rosh Pinah Underground Mine mineral resource estimate is reported based on 5% zinc equivalent cut-off grade with metal prices of: US$1.16/lb zinc, US$1.00/lb lead, US$18.18/oz silver, FX: NAD/US$ 13.30. The Rosh Pinah Underground Mine mineral resource estimate has been prepared by the mine geology department and non-independent technical consultants to the Company with an effective date of December 31, 2017 and has been reviewed and approved by Professional Geologist Ian Blakley (P.Geo.), a consultant with Roscoe Postle Associates Inc., who is an independent Qualified Person as defined in NI 43-101 and will be detailed in the technical report entitled “Technical Report on the Rosh Pinah Mine, Namibia” to be dated April 10, 2018, which will be available under the Company’s profile on SEDAR at www.sedar.com within 45 days.

Rosh Pinah Production Statistics(3)

 

Q1-2018 Preliminary Production

Q4-2017 Production

Tonnes Mined

172,334

177,820

Tonnes Milled

177,837

171,020

Average Head Grades:

  

Zinc (%)

7.92%

8.40%

Lead (%)

1.40%

1.40%

Silver (ozs/ton)

0.58

0.50%

Average Recoveries (%):

  

Zinc

88%

80%

Lead

77%

60%

Silver

51%

52%

Payable Production:

  

Zinc (lbs)

22,831,575

21,336,745

Lead (lbs)

3,925,012

3,081,212

Silver (ozs)

50,794

49,316

(3) Trevali acquired ownership (80%) of Rosh Pinah on August 31, 2017.

2018 Production Guidance(4)

 

2018 Zinc Production

(million lbs payable)

2018 Lead Production

(million lbs payable)

2018 Silver Production

(000 ozs payable)

Annual Site Operating Cost Guidance (per tonne)

Rosh Pinah

105-115

5.7-6.0

123-129

$49-$54

(4) Production guidance presented on a 100% basis, Trevali owns 80% of Rosh Pinah. Constitutes forward-looking information; see “Cautionary Note Regarding Forward-Looking Statements”.

© 2018 Trevali Mining Corporation
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