Question: Which operator has a rank of 7?
SQL: SELECT "Operator" FROM "2-12728719-1" WHERE "Rank" = 7.0;

Question: What's the lowest ranking source of copper, Copper ore, concentrated and leached?
SQL: SELECT MIN("Rank") FROM "2-12728719-1" WHERE "Source of copper" = 'Copper ore, concentrated and leached';

Question: What's the name of the operator who has the Mission Complex mine and has a 2012 Cu Production (lbs) larger than 23.3?
SQL: SELECT "Operator" FROM "2-12728719-1" WHERE "2012 Cu Production (lbs)" > 23.3 AND "Mine" = 'Mission Complex';