Diamonds Doing Good
One of our objectives is to demonstrate that through responsible development of diamond projects, the good that flows into the local communities, the economy and the country. Through perseverance and by investing back into the Company and Community this has provided the community with access to clean drinking water, promotes education and training, provides free healthcare and develops infrastructure, all with a long term view that what we do well today, will enable others to prosper tomorrow.
Diamond Deposits FAQs
- Some kimberlites occur as steep-sided pipe-like bodies that are the erosional remnants of kimberlite volcanoes. These generally occur as clusters of two or more pipes. Kimberlite pipes are commonly filled with volcaniclastic kimberlite, a mixture of fragmented kimberlite and country rock material. Kimberlite pipes are sometimes associated with previously-formed kimberlite dykes and the pipes themselves may be cross-cut by later kimberlite dykes. The surrounding host rock is commonly brecciated and altered as a result of pipe formation.
Types of Diamond Deposits
The Kimberley Process
Sierra Leone and the Kimberley Process Certification Scheme
With the burden of being the birthplace of the concept of “conflict diamonds”, The Republic of Sierra Leone carries the tremendous responsibility to its citizens and the international community to ensure that diamonds recovered from the alluvial river gravel deposits mined by the many artisanal mining licence holders, as well as those liberated from the hard rock kimberlite pipes and dykes by large-scale commercial, mechanised mining operations like Koidu Limited, are not used to fund armed conflict anywhere in the world.
The Kimberley Process Certification Scheme (KPCS) was established in May 2000 to find a solution to the international problem of the trade in conflict diamonds, “which can be directly linked to the fuelling of armed conflict, the activities of rebel movements aimed at undermining or overthrowing legitimate governments, and the illicit traffic in, and proliferation of, armaments, especially small arms and light weapons”. The KPCS is an international certification scheme for rough diamonds, based on national laws and practices and meeting internationally agreed minimum standards.
Diamonds of Sierra Leone
Famous Diamonds of Sierra Leone
Two of the world’s ten largest and most famous rough diamonds were discovered in the gravels of the Woyie River flowing through the town of Koidu. Tributaries of the Woyie River have drained the areas surrounding the Koidu kimberlite pipes and dykes over millions of years, concentrating diamonds and other heavy minerals derived from the kimberlite into rich alluvial diamond deposits.
The first large diamond to be recovered from the Woyie River in March 1943 weighed 249.25 carats, followed by an even larger 532 carat stone in June of the same year. The Woyie River Diamond, weighing 770 carats, was found in January 1945 and, at that time, was the largest alluvial diamond known. After a hiatus of almost 27 years, the fourth and largest diamond to be recovered from the Woyie River presented itself on the picking table of the Diminco recovery plant. The Star of Sierra Leone, as it became known, weighed 968.9 carats and is currently ranked the third largest rough diamond in the world, with the Woyie River Diamond in sixth place.
Although being of the finest colour, both the Star of Sierra Leone and the Woyie River Diamond contained flaws and impurities which dictated the number and shape of the polished stones finally separated from the original rough diamond. The Star of Sierra Leone was first cut into an emerald shaped stone weighing 143.2 carats but was later re-cut due to an internal flaw into seventeen smaller stones. Six of the stones, including the largest which weighed 53.96 carats, were incorporated into the Star of Sierra Leone Brooch. The Woyie River Diamond was cut into 30 gem stones, the largest of which was an emerald cut weighing 31.35 carats and became known as the Victory diamond.