What was the Bronco's record when they played the Detroit Lions at Mile High Stadium?
CREATE TABLE "schedule" (
  "week" text,
  "date" text,
  "opponent" text,
  "result" text,
  "game_site" text,
  "record" text
);
SELECT "record" FROM "schedule" WHERE "game_site"='mile high stadium' AND "opponent"='detroit lions';