CREATE TABLE table_15624586_2 (indigenous_mining_production_2006 VARCHAR(255), _percentage_of_world_demand VARCHAR(255))
What is the  indigenous mining production of the country that uses 3.4% of the world demand?
    
SQL: SELECT indigenous_mining_production_2006 FROM table_15624586_2 WHERE _percentage_of_world_demand = "3.4%"