Sustainable development of raw materials

in challenging environments


Operations are fully controlled by Tandem Liber. These operations are coordinated from our compound location in Bo.


All members of the team have a long history on a personal level. There is a high acceptance of each other skills, personalities and expertise. Next to that is there a exceptional relationship with the locals. These relationships are divers, from the minister to the village chiefs. But always based upon respect and the will to make things work towards a mutual benefit.

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.

Complete listing of our resources as well as our internal valuations are available upon request.



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.