“ The duties of exportation that may be levied on minerals exploited in the zone referred to in the preceding articles shall not exceed those now in force, and Chilean citizens, industry, and capital shall not be subjected to any other contributions what ever except those now existing. ”

“ The natural products of Chile that may be imported into the Bolivian littoral between parallels 23 and 24 shall be free and exempt from all duties, and reciprocally, natural products of Bolivia that may be imported into the Chilean littoral between parallels 24 and 25 shall be exempt and free from all duties. ”