Overview
| Status | Temporary Suspension |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 2030 |
Williamson mine has become one of the world’s most important source of large pink diamonds.
November 7, 2022 - The eastern wall of the Tailings Storage Facility (TSF) at the Williamson mine was breached, resulting in flooding away from the pit which has extended into certain areas outside of the mine lease area.Mine production has been suspended pending an investigation into the incident.
Resume production around the middle of 2023. |
| Latest News | Entry into definitive transaction agreements pursuant to MOU for the sale of 50% of Petra's holding in Williamson Diamonds Limited May 31, 2023 |
Source:
p. 4,65
| Company | Interest | Ownership |
|
Government of Tanzania
|
25 %
|
Indirect
|
|
Petra Diamonds Ltd.
|
75 %
|
Indirect
|
|
Williamson Diamonds Ltd.
(operator)
|
75 %
|
Direct
|
Petra: 75%;
the Government of Tanzania: 25%.
After completion (expected in H1 FY 2023) of the Framework Agreement and MoU with Caspian, Petra will hold an effective 31.5% interest in the Williamson mine, with the Government of Tanzania holding 37% and Caspian Limited holding 31.5%.
Contractors
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Summary:
The mine is an open pit operation based upon the 146 hectare Mwadui kimberlite pipe, which is the world’s largest economic kimberlite to have seen continuous mining.
Despite having been in operation since 1940, the pit is only 95 metres at its deepest point due to the large size of the deposit. The low grade of the deposit is countered by the high value of its diamonds and lends itself well to high volume, bulk mining methods.
Summary:
The mine is an open pit operation based upon the 146 hectare Mwadui kimberlite pipe, which is one of the world’s largest economic kimberlites.
Despite having been in operation since 1940, the pit is only 105 metres at its deepest point due to the large size of the deposit. The low grade of the deposit is countered by the high value of its diamonds and lends itself well to high volume, bulk mining methods.
Source:
Summary:
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Production:
Operations at Williamson recommenced in August 2021, having been on care and maintenance from April 2020.
| Commodity | Units | 2022 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|
Diamond
|
carats
| ...... | ...... | ...... | 341,102 | 225,202 | 212,869 | 202,265 |
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Operational Metrics:
| Metrics | 2022 | 2020 | 2019 | 2018 | 2017 |
|
Tonnes processed
| ...... | ...... | 5,495,470 t | 5,045,284 t | 4,071,592 t |
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Reserves at June 30, 2022:
Resource bottom cut-off: 1.15mm.
Reserve bottom cut-off: 1.15mm.
| Category | Tonnage | Commodity | Grade | Contained carats |
|
Probable
|
42.8 Mt
|
Diamond
|
7.2 cpht
|
3.09 M carats
|
|
Indicated
|
61.2 Mt
|
Diamond
|
4.9 cpht
|
2.98 M carats
|
|
Inferred
|
956.8 Mt
|
Diamond
|
3.6 cpht
|
34.71 M carats
|
|
Total Resource
|
1,018 Mt
|
Diamond
|
3.7 cpht
|
37.69 M carats
|
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