CREATE TABLE "copper_mining_today" (
  "rank" real,
  "mine" text,
  "county" text,
  "operator" text,
  "source_of_copper" text,
  "2012_cu_production_lbs" real
);

Question: Which operator has a rank of 7?
SQL: SELECT "operator" FROM "copper_mining_today" WHERE "rank"=7;

Question: What's the lowest ranking source of copper, copper ore, concentrated and leached?
SQL: SELECT MIN("rank") FROM "copper_mining_today" 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 "copper_mining_today" WHERE "2012_cu_production_lbs">23.3 AND "mine"='mission complex';