Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longhole open stoping
- Avoca
- Cut & Fill
- Room-and-pillar
- Unconsolidated rockfill
|
Production Start | ... |
Mine Life | 2026 |
The operations at the Rasp Mine include underground mining operations, a processing plant producing zinc and lead concentrates.
Broken Hill Operations Pty Ltd. is seeking to modify the Rasp Mine Project Approval to allow for the co-placement of tailings with excess waste rock from underground mining into Kintore Pit as Tailings Storage Facility 3 (TSF3) critical to the continuation of mining operation.
The Life of Mine (LoM) post 2026 would continue to develop the Centenary Mineralisation and extend the Main Lode to all mining blocks. A modification application would be submitted to extend mining operations past 2026 and to include mining areas that are not within the current PA. |
Source:
p. 4,7
Company | Interest | Ownership |
Toho Zinc Co. Ltd.
|
100 %
|
Indirect
|
Broken Hill Operations Pty Ltd.
(operator)
|
100 %
|
Direct
|
The CBH Resources Limited is a wholly owned subsidiary of Toho Zinc Co., Ltd.
Broken Hill Operations Pty Ltd, a wholly owned subsidiary of CBH Resources Limited, owns and operates the Rasp Mine.
Contractors
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Summary:
The ore deposits at RASP Mine are hosted by a sequence of Proterozoic meta-sedimentary rocks.
Mining operations are primarily focused on the extraction of the Western Mineralisation (WM), combined with lesser quantities of high grade remnants of 2 and 3 Lens, and Zinc Lodes that are associated with the original Main Lode.
The original unmined WM contained a global resource of approximately 15Mt at a combined PbZn grade of 6.0%. However, mining operations are focused on extraction of areas of higher grade material.
The WM extends from approximately 100m below the surface to a depth of near 900m, where the deposit terminates against the Globe Vauxhall Shear. Mineralisation identified below this structure is associated with the Centenary Deposit which still remains open at depth.
Mining Methods
- Longhole open stoping
- Avoca
- Cut & Fill
- Room-and-pillar
- Unconsolidated rockfill
Summary:
Mining operations are undertaken predominantly by an owner/operator workforce, with contractors being utilised to undertake specialised support services including fibrecrete and diamond drilling. Mining rates are in the order of 60,000t per month for a 100% trucking operation to the surface.
Mining involves development drives similar to a tunnel to access the orebody and ore is extracted by the excavation of large underground voids called stopes. Underground stoping production is dependent on the ore geometry and geotechnical parameters. Stope techniques employed at Rasp Mine include longhole open stoping, modified avoca, cut-and fill and room-and-pillar. Approximately 60 stopes are extracted per annum with mining depth at approximately 500 metres below the surface.
Once the ore has been extracted, waste material from the mining operation is used to backfill these voids. This is in the form of unconsolidated waste material (rockfill) with the aim to utilise the existing sandplant in the manufacture of hydraulic fill in the near future.
The Rasp Mine has revised (July 2020) its mine production plan for the period 2020 to 2026 implementing a new mine production strategy based on lower volumes and higher grades. Yearly production rates are now planned with a maximum capacity of 500,000 t of ore, 146,000 t of waste rock to surface from underground mining and development, 480,000 t of tailings harvesting transferred to Kintore Pit and 440,000 t of ........
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Flow Sheet:
Summary:
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Reserves at June 30, 2014:
Category | Tonnage | Commodity | Grade |
Probable
|
310 kt
|
Zinc
|
7.4 %
|
Probable
|
310 kt
|
Lead
|
6 %
|
Probable
|
310 kt
|
Silver
|
94 g/t
|
Corporate Filings & Presentations:
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