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Tanzania

Williamson Mine

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Williamson Mine

Location: 5 km NE from Kolandoto, Tanzania

Regional Office:

B 6
Kolandoto
Tanzania

Contacts:

Additional Resources for Suppliers & Investors

Categories

Summary

Mine TypeOpen Pit
StatusActive
Commodities
  • Diamond
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
Mine Life... Lock
SnapshotThe Williamson mine is renowned for producing beautifully rounded white diamonds and distinctive “bubble-gum” pink diamonds. Following the closure of Argyle, Williamson has become one of the most reliable sources of pink diamonds globally.

Williamson restarted production in July 2023 ahead of schedule, followed by a steady ramp-up through the Year. This enabled access to higher-grade ore. The Williamson grade profile is not homogenous and is governed by the rate of mining and stripping and which areas can be opened up for production at any given time.

In May 2025, the mine was sold to a private company. Since then, detailed information about the asset has not been publicly available.

Owners

SourceSource
CompanyInterestOwnership
Government of Tanzania 25 % Indirect
Taifa Group 75 % Indirect
Pink Diamonds Investments Limited (operator) 100 % Direct
Since 2025, the Williamson mine has been owned by Pink Diamonds, a group company of the Taifa Group — a leading technical mining services provider — in partnership with the Government of the Republic of Tanzania.

On 14 May 2025, Petra Diamonds completed the sale of its entire shareholding in the entity holding its interest in Williamson Diamonds Limited, together with all related shareholder loans, to Pink Diamonds Investments Limited.

Pink Diamond Investment is a Tanzanian entity affiliated with Taifa Group. Taifa now assumes full ownership of an asset. Pink Diamonds Investments, backed by Taifa Group, is well-positioned to manage the mine.

Contractors

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SourceSource

Deposit type

  • Kimberlite

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.

Reserves

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Mining Methods

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Heavy Mobile Equipment

Fleet data has not been reported.

Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Water usage

Parameter20242023202220212020
Water use efficiency 1.14 m3/t1.86 m3/t2.06 m3/t1.45 m3/t
Fresh water 3,404,327 m3
Recycled water 14,520,436 m319,508,070 m3
Surface water 5,628,852 m3138,286 m3
Third-party water 1,758,721 m3191,994 m3

Commodity Production

After the change of ownership in May 2025 there is no data on diamond production for FY2025.

During 2023, there was lower production due to Williamson being on care and maintenance for around 7 months of the year.

Restarted production in July 2023 ahead of schedule with steady ramp-up through FY2024.
CommodityProductUnits202420232022202020192018201720162015
Diamond Crystals carats  ....  Subscribe  ....  Subscribe
Diamond carats  ....  Subscribe  ....  Subscribe 399,615 341,102 225,202 212,869 202,265

Operational metrics

Metrics202420232022202020192018201720162015
Tonnes processed  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 5,495,470 t 5,045,284 t 4,071,592 t 4,420,632 t 4,426,044 t

Production Costs

Commodity production costs have not been reported.

Operating Costs

Currency2024202320222020201920182017
Total operating costs ($/t milled) USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe

Mine Financials

Units20242023202220212020201920182017
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 8.6   4.6   15  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 93   68.5   58.4  
Operating Income M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe -50   13.4   -2.9  
Operating Cash Flow M USD  ....  Subscribe  ....  Subscribe

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 31, 2025
....................... Subscription required ....................... Subscription required Subscription required Oct 31, 2025

Workforce

EmployeesContractorsTotal WorkforceYear
...... Subscription required 2024
...... Subscription required ...... Subscription required ...... Subscription required 2023
...... Subscription required ...... Subscription required ...... Subscription required 2022
...... Subscription required ...... Subscription required ...... Subscription required 2021
...... Subscription required ...... Subscription required ...... Subscription required 2020
...... Subscription required ...... Subscription required ...... Subscription required 2019
...... Subscription required ...... Subscription required ...... Subscription required 2018
...... Subscription required ...... Subscription required ...... Subscription required 2017
...... Subscription required ...... Subscription required ...... Subscription required 2016

Aerial view:

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