- OFS Engineering and Consulting LTD.
- Tantalite, Niobium, Ore.
- Address:Rua Djalma Ulrich 329 Apto. 1001 Rio de Janeiro RJ 22071-020 Brazil
- White Solder
- Tantalum, Niobium (Columbite) and Tin Ingots..
- Address:Rua Peru, 1752
- Colymar Engenharia Ltda
- Kaulim, Niobium, Tantalite.
- Address:Rua Rio Verde, 551 Belo Horizonte Minas Gerais 30310750 Brazil
- Marcassa Comercial Ltda
- ore of manganese, copper, tantalite, columbite, coltan, titanium, tantalum, niobium.
- Address:pedro paulo conceicao Qd M Lt 22 814 cs 04, Lauro de freitas, Bahia, Brazil
- Bealay Trade
- columbite, niobium, and alloystrading services.
- Address:Brazil
- Paradiso Chemical Products LTD
- Tantalum Pentoxide,Niobium,Tantalum.
- Address:Anita Garibaldi
- Grupo GRAS Mineracao LTDA.
- iron, nickel, coal, manganese, aluminium, copper, potassium, phosphate, niobium ores.
- Address:Brazil
- Vargas Partners Group
- Niobium,Tantalum,Silver.
- Address:Av. Pauista 1337 cj 706
- SPHERA ARQUITETURA E CONSTRUCOES LTDA
- Niobium,Tantalite,Cassiterite (tin),Manganese,MANGANESE MINE.
- Address:Rua 19 Nr 151 Sala 401 Setor Central
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