CREATE TABLE table_204_944 (id DECIMAL, "mine" TEXT, "province" TEXT, "coordinates" TEXT, "town" TEXT, "dates" TEXT, "comments" TEXT)

which mine was open longer , golden giant or beanland mine ?
SELECT "mine" FROM table_204_944 WHERE "mine" IN ('golden giant mine', 'beanland mine') ORDER BY "dates" - "dates" DESC LIMIT 1
SELECT "mine" FROM "table_204_944" WHERE "mine" IN ('golden giant mine', 'beanland mine') ORDER BY "dates" - "dates" DESC NULLS LAST LIMIT 1