Data and information provided by third parties used when preparing this report, consist of documents and oral interviews with the owners of EXPRESSO LEÃO MINING as well as with consultants and directors of companies with operations in the sector. The estimates used in the valuation process comprised in this report, are based on documents and information which include, among others, the following:

i. Final Integrated Mineral Research Report, registered with DNPM (National Department of Mineral Production) under no.900207/03, em 20/06/03

ii. Tests and Chemical Analyses of various entities (CNEN-CDTN ; CETEC ; UFPR ; SGA))

iii. Investment Plan for Refining Plant, provided by Ferrostaal consultant

iv. Report entitled "The Economics of Natural Graphite" of Roskill, 2002 edition

v. "Mineral Commodity Summaries", US Geological Survey, of January 2003

vi. Report entitled "Natural Graphite Market", DNPM, 2002 edition