Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longhole open stoping
- Transverse open stoping
- Longitudinal open stoping
|
Production Start | ... |
Mine Life | 2034 |
Rosh Pinah Zinc is an operating underground zinc-lead mine located in southwestern Namibia. Appian concluded its acquisition of the asset in June 2023.
The mine has been in operation since 1969, producing zinc and lead sulphide concentrates, as well as smaller amounts of copper, silver, and gold.
Appian plans to expand the operation through a project known as the Rosh Pinah Expansion Project (RP2.0), adding new processing facilities including a dedicated portal and decline to extended deposits and a paste fill and water treatment plant. |
Source:
p. 1
The Rosh Pinah Mine is owned by Rosh Pinah Zinc Corporation (Pty) Ltd. (“RPZC”). Trevali owns a 90% interest in RPZC and is operationally responsible for the management of RPZC, with the remainder held by PE Minerals (Namibia) (Proprietary) Limited, Jaguar Investments Four (Proprietary) Limited and an Employee Empowerment Participation Scheme.
On June 27, 2023, Trevali Mining Corporation completed the sale of its 90% interest in the Rosh Pinah Mine located in Namibia to funds advised by Appian Capital Advisory LLP.
Contractors
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Summary:
The Rosh Pinah deposit 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 Gariep Terrane is divided into two distinct tectono-stratigraphic sub-terranes; the eastern, para-autochthonous Port Nolloth Group and the western, allochthonous Marmora Terrane.
The base metal sulphides (BMS) at Rosh Pinah are contained within the approximately 30 m thick mineralized horizon, which is locally termed the ore equivalent horizon (OEH). In the Property, the Rosh Pinah Formation has been shown to be at least 1,250 m thick.
The major mineralization types are:
• Microquartzite and argillite;
• Arkose / breccia;
• Carbonate.
The Rosh Pinah deposit is hosted by a thick package of turbidites comprising hinterland and contemporaneous volcanic clastics deposited in a Neo-Proterozoic rift basin during the early part of the evolution of the Gariep Terrane of southern Namibia. Metals scavenged from a primary argillite mineralization were concentrated by late hydrothermally driven carbonate alteration, providing a carbonate host. Basin inversion led to oblique continental collision and complex deformation of the deposit, resulting in two phases of disharmonic overfolding with associated faulting and shearing.
The deposit is consequently presented as a series of discrete car ........
Mining Methods
- Longhole open stoping
- Transverse open stoping
- Longitudinal open stoping
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 consistent zinc and lead feed grade to the mill. Blended or ........
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Flow Sheet:
Summary:
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Pipelines and Water Supply
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Reserves at December 31, 2021:
The Rosh Pinah Underground Mine Mineral Reserve estimate is reported based on planned stopes with a net smelter return cut-off value of $50/tonne, with average metal prices of: $1.17/lb zinc, $1.00/lb lead and $24.13/oz silver.
The Rosh Pinah Underground Mine Mineral Resource estimate is reported based on a cut-off grade of 4% ZnEq.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
7.5 Mt
|
Zinc
|
5.64 %
|
933 M lbs
|
Proven
|
7.5 Mt
|
Lead
|
1.29 %
|
213 M lbs
|
Proven
|
7.5 Mt
|
Silver
|
20.1 g/t
|
4,844 koz
|
Probable
|
9.25 Mt
|
Zinc
|
5.9 %
|
1,202 M lbs
|
Probable
|
9.25 Mt
|
Lead
|
1.24 %
|
253 M lbs
|
Probable
|
9.25 Mt
|
Silver
|
19.45 g/t
|
5,781 koz
|
Proven & Probable
|
16.74 Mt
|
Zinc
|
5.78 %
|
2,135 M lbs
|
Proven & Probable
|
16.74 Mt
|
Lead
|
1.26 %
|
466 M lbs
|
Proven & Probable
|
16.74 Mt
|
Silver
|
19.74 g/t
|
10,625 koz
|
Measured
|
10.84 Mt
|
Zinc
|
7.34 %
|
1,755 M lbs
|
Measured
|
10.84 Mt
|
Lead
|
1.87 %
|
447 M lbs
|
Measured
|
10.84 Mt
|
Silver
|
28.3 g/t
|
9,865 koz
|
Indicated
|
9.1 Mt
|
Zinc
|
7.42 %
|
1,488 M lbs
|
Indicated
|
9.1 Mt
|
Lead
|
1.79 %
|
359 M lbs
|
Indicated
|
9.1 Mt
|
Silver
|
27.8 g/t
|
8,132 koz
|
Measured & Indicated
|
19.94 Mt
|
Zinc
|
7.38 %
|
3,244 M lbs
|
Measured & Indicated
|
19.94 Mt
|
Lead
|
1.83 %
|
805 M lbs
|
Measured & Indicated
|
19.94 Mt
|
Silver
|
27.71 g/t
|
17,764 koz
|
Inferred
|
0.78 Mt
|
Zinc
|
8.09 %
|
139 M lbs
|
Inferred
|
0.78 Mt
|
Lead
|
1.41 %
|
24 M lbs
|
Inferred
|
0.78 Mt
|
Silver
|
47.36 g/t
|
1,183 koz
|
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