Overview
| Status | Care and Maintenance |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
The Group undertook a strategic review of Granville in September 2019 in order to determine the most economically efficient means of extracting value from the project. Post the strategic review, it was decided to place Granville on care and maintenance until a suitable mine fleet is available and additional equipment is installed at the plant. The Group has assessed and considered it prudent to maintain the provision for impairment against the Ore stockpiles and Tin in tailings recognised in the prior periods.
Aus Tin Mining is maintaining these properties in good standing in a care-and-maintenance state as it fields enquiries from parties potentially willing to acquire the assets. |
Source:
p. 3,9
During the quarter Clara Resources Australia Ltd. executed a binding term sheet for the sale of the company’s wholly owned subsidiary, Ten Star Mining Pty. Ltd (“Ten Star”). Ten Star holds the tenements and other assets, including a rehabilitation bond, relating to the Granville Tin project in Tasmania.
It is anticipated full transaction documents will be completed with an execution date on or before 15 November 2022 and a settlement date of 21 December 2022.
Contractors
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Summary:
The deposit is hosted in metamorphosed Neo- Proterazoic black carbonaceous shale and calcareous quartzite of the Oonah formation overlaid by Tertiary conglomerate, gravel and grit and subsequent Quaternary stream alluvium and swamp and marsh deposits. Mineralization occurs in the horizon of scarts with a magnetite strip associated with the layers, and tin is found as a supergene at a late stage, a low-temperature formation, that is, post-dating of skarn formation, and also (in the form of silicate) released during serpentinization. The horizon of the mineralized skarn extends approximately 50 meters long (north-south) and 15 meters wide (east-west).
Summary:
The current pit crest dimensions are approximately 125 m long (60 m at base of pit), 45 m to 50 m (25 m to 30 m at base) wide at its maximum and 20 m deep. The proposed expansion will increase the length of the pit base to 90 m with no effective increase in pit width at the base. The footprint at the crest is expected to increase to about 180 m in length and 110 m wide, disrupting approximately 0.5ha of relatively undisturbed vegetation in the process. The final pit depth will be nominally 40 m from the crest of the footwall shale (western slope) and 60 m from the crest of the hanging-wall (eastern side). Based on the current pit slope performance, the western pit wall will follow the footwall shale down to final pit depth as a single height highwall.
Based on the geometry of the final pit, it is proposed that the expansion will occur as a single cutback to the final pit void to allow adequate room for equipment to safely operate during mining. This cutback will be taken from the eastern and southern extent of the pit, retreating from the south towards the north for each cut. Depending on ore supply a shallow drop cut may be taken initially to ensure constant feed for the plant.
A nominal ramp grade of 1V to 6.5H (15 percent) will be adopted for design, so for a pit depth of 35 m, assuming a 5 m deep goodbye cut, the ramp will need to have a horizontal length of approximately 230 m. A minimum ramp width of 11.5 m will be allowed based on 2.5 x the width ........
Source:
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Flow Sheet:
Summary:
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Projected Production:
| Commodity | Units | LOM |
|
Tin
|
kt
| 0.8 |
All production numbers are expressed as concentrate.
Operational Metrics:
| Metrics | |
|
Daily milling rate
| 160 t * |
|
Annual ore mining rate
| 26,667 t * |
|
Annual milling capacity
| 40,000 t * |
|
Stripping / waste ratio
| 4 * |
|
Waste tonnes, LOM
| 145,000 t * |
|
Ore tonnes mined, LOM
| 40,000 t * |
|
Total tonnes mined, LOM
| 185,000 t * |
* According to 2016 study.
Mine Management:
| Job Title | Name | Profile | Ref. Date |
|
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Nov 22, 2022
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Corporate Filings & Presentations:
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