CREATE TABLE table_name_48 (year INT, theme VARCHAR, mintage VARCHAR)

What is the earliest year a red maple had a mintage over 15,000?
SELECT MIN(year) FROM table_name_48 WHERE theme = "red maple" AND mintage > 15 OFFSET 000
SELECT MIN("year") FROM "table_name_48" WHERE "mintage" > 15 AND "red maple" = "theme" OFFSET 000