In Nova Olinda region.
Companhia de Pesquisa de Recursos Minerais, 1999, List of selected mineral deposits in Brazil, in Gurmendi, A.C., Barboza, F.L.M., and Thorman, C.H., eds., The mineral economy of Brazil: U.S. Geological Survey Digital Data Series 5, CD ROM.
Friedrich, A., 1997, Geologia do potassio [Geology of potassium], in Schobbenhaus, C., Queiroz, E.T., and Silva Coelho, C.E., eds., Principais depositos minerais do Brasil, v. IV, Rochas e minerais industriais [Major mineral deposits in Brazil, v. 4, Industrial rocks and minerals]: Brasilia, [Brazil] Departamento Nacional de Producao Mineral, p. 253-255.
Garrett, D.E., 1996, Potash; Deposits, processing, properties and uses: New York, Chapman and Hall, 734 p.
Gurmendi, A.C., Barboza, F.L.M., and Thorman, C.H., 1999, The mineral economy of Brazil: U.S. Geological Survey Digital Data Series 53, CD-ROM.
Notholt, A.J.G., 1983, Potash in developing countries, in McKercher, R.M., ed., Potash 83; Potash technology; mining, processing, maintenance, transportation, occupational health and safety, environment: Toronto, Canada, Pergamon Press, p. 29-40.
Pinheiro, J.C. de F., 2008, Producao e comercializacao de fertilizantes agricolas no pais; Titulos de Concessao de Pesquisa Mineral e Lavra de Fosfato e Potassio [Production and marketing of agricultural fertilizers in the country; Securities Grant Mineral Research and Exploitation of Phosphate and Potassium]: [Brazil] Departamento Nacional de Producao Mineral, 50 p., accessed November 28, 2008, at http://www2.camara.gov.br/atividade-legislativa/comissoes/comissoes-permanentes/capadr/audiencias-2008/rap150708joaocesar.pdf.Rezende, N.G.A.M., 2001, Insumos minerais para agricultura e areas potenciais nos Estados do Para e Amapa [Inputs for agriculture and mineral potential areas in the states of Para and Amapa]: Brazil, Companhia de Pesquisa de Recursos Minerais (CPRM), 57 p.
Roskill Information Services Ltd., 1989, The economics of potash (2d ed.): London, Roskill Information Services Ltd., 121 p.
Sad, A.R., Campolina, A., Costa, A.M., Lima, F.R.T., and Carvalho, R.S., 1997, Deposito de potassio de Fazendinha, Nova Olinda do Norte, Amazonas [Fazendinha potassium deposit, Nova Olinda do Norte, Amazonas], in Schobbenhaus, C., Queiroz, E.T., and Silva Coelho, C.E., eds., Principais depositos minerais do Brasil, v. IV, Rochas e minerais industriais [Principal mineral deposits of Brazil, v. IV, Industrial rocks and minerals]: Brasilia, [Brazil] Departamento Nacional de Producao Mineral, p. 257-276.