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Sustainable development of raw materials

in challenging environments


Operations are fully controlled by Tandem Liber. These operations are coordinated from our head office in Freetown and our locations in Makeni- and Kenema.


All members of the team have a long history on a personal level with our company. There is a high acceptance of individual personal skills, personalities and expertise. Next to that is there an exceptional relationship with the locals. These relationships are divers, from the Minister of Mines to the village Chiefs and Indigenous representatives. But always based upon respect and the will to make things work towards a mutual benefit for the people, the countries in which we are active, and the company.

In total 52 mineral and precious metal resources can be found within the projects, of which 14 are commercially viable for mining exploitation.  Columbite, Gold, Tantalite and Niobium are the prime resources of our operations and internal valuations.

All our resource projects are brought up to the NI-43101 standard, to ensure that the double verified resource values will be part of the intended value chain. 

The origin of Tandem Liber Holdings is Sierra Leone as "ground zero", but there is also a spread of interest in other countries/continents, and also the expansion for other Natural Resources like water, copper, engergy or any other Natural Resource that can qualify.



Columbite, also called niobite, niobite-tantalite and Columbite [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium. It has a submetallic cluster and a high density and is a niobate of iron and manganese.



The mineral group tantalite [(Fe, Mn)Ta2O6] is the primary source of the chemical element tantalum. It is chemically similar to Columbite, and the two are often grouped together as a semi-singular mineral called Coltan.



Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable and ductile metal. Chemically, gold is a transition metal and a group 11 element.



Niobium, formerly columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and Columbite.

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