Question: What is the  indigenous mining production of the country that uses 3.4% of the world demand?
Schema: create table table_15624586_2 (indigenous_mining_production_2006 varchar, _percentage_of_world_demand varchar, PRIMARY KEY (indigenous_mining_production_2006))
SQL: select indigenous_mining_production_2006 from table_15624586_2 where _percentage_of_world_demand = "3.4%"