Tanzania Williamson Diamond Mine Production Increased By +17% in 2019

Tanzania Williamson diamond production 2019

Petra Diamonds (LSE: PDL), the mining company that partially owns – together with the Government of Tanzania (GOT) – and operates the Williamson diamond mine in Tanzania, has published its Trading Update for the 6 Months ended 31 December 2019, showing that the ROM production at the mine increased 3% to 214,888 carats.

This is higher than the previous forecasts of H1 FY 2019 of 208,064 carats, demonstrating the continued steady operational delivery of the mine.

Williamson is Tanzania’s only important diamond producer. 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.

The ownership of the mine is split between Petra Diamonds (75%) and the GOT (25%), and its potential is +50 years.

In FY 2019, the Williamson mine produced a total of 386,016 carats versus 328,681 carats in FY 2018 (+17%). And in 2019, Petra Diamonds sold a total of 402,329 carts from the mine, versus 253,524 carats in FY 2018 (+59%), for a total of USD 93 Million versus USD 68.5 Million.

However, the average price per carat has fallen by -14% to USD 231 versus USD 270 in 2018. But Richard Duffy, Chief Executive of Petra Diamonds, commented that rough diamond pricing has modestly improved moving into Q3 2019.

Meanwhile, the company remains in discussions with the GOT and local advisers in relation to various issues, including the overdue VAT receivables and the blocked parcel.

Tanzania Diamonds
In 2015, Tanzania was the 10th largest diamond producer in Africa after Botswana (17.3m ca), Angola (7.1m ca), South Africa (6m ca), the Democratic Republic of Congo (3.15m ca), Namibia (1.92m ca), Sierra Leone (0.5m ca), Zimbabwe (0.5m ca), Lesotho (0.35m ca) and Ghana (0.24m ca).

Diamonds in Tanzania are found mainly in the Williamson diamond mine, which is located south of the town Mwanza in northwest Tanzania.

Want to know more about Mining in Tanzania? Our free Tanzania Business and Investment Guide 2026 covers Mining, plus regulations, key sectors, and investment opportunities—all in one place.

Download Free Guide
Related Posts
Tanzania Anthony Mavunde Kitila Mkumbo Small-Scale Miners Recommendations Report
Read More

Tanzania Plans Mining Fund and Credit Guarantees to Support Small-Scale Miners

The Government of Tanzania has received recommendations aimed at strengthening the small-scale mining sector through improved access to finance, technology, and geological information. The proposals include establishing a mining fund, expanding credit guarantees, and supporting mineral research to increase employment, reduce poverty, and boost economic growth.
Kabanga Nickel Deposit
Read More

USD 942M Kabanga Nickel Project Moves Closer to Implementation, FID Expected in 2026

The Kabanga Nickel Project has moved closer to implementation after Lifezone Metals (NYSE: LZM) Executive Chairman Keith Liddell and Treasury Registrar Nehemiah Mchechu briefed President Samia Suluhu Hassan on 8 June 2026, with both sides confirming an agreed project structure and turning to finalise the refinery and beneficiation component. The USD 942 million project is targeting a final investment decision in 2026 and is expected to generate USD 2.4 billion in corporate income taxes and around 1,090 jobs.
Lindi Jumbo and Tanzanian government sign graphite joint venture in Ruangwa, Lindi
Read More

Tanzania Government Secures 16% Stake in Lindi Jumbo Graphite Mine Through Ndovu Graphite Joint Venture

The Tanzanian government has formalized its statutory 16% non-dilutable equity stake in the Lindi Jumbo graphite mine in Lindi Region through a joint venture agreement that creates Ndovu Graphite Limited, with Lindi Jumbo Limited retaining an 84% stake. The mine produces 40,000 tonnes of graphite per year over a 24-year mine life, and Tanzania currently ranks sixth globally in graphite production, with an annual output of 25,000 tonnes from two large-scale operating mines, Lindi Jumbo and God Mwanga, in Tanga.