CREATE TABLE table_61879 ("Colliery" CLOB, "Location" CLOB, "Date" CLOB, "Year" FLOAT, "Death toll" FLOAT, "cause" CLOB)

Which Colliery has a Death toll of 7?
SELECT "Colliery" FROM table_61879 WHERE "Death toll" = '7'
SELECT "Colliery" FROM "table_61879" WHERE "Death toll" = '7'