CREATE TABLE table_28596 ("Location" TEXT, "Date" FLOAT, "Denomination" TEXT, "Coinage metal" TEXT, "Mintage" FLOAT, "KM number" TEXT)

What is the mintage for a location of Sion and a denomination of 00500 500 Francs?
SELECT "Mintage" FROM table_28596 WHERE "Location" = 'Sion' AND "Denomination" = '00500 500 francs'
SELECT "Mintage" FROM "table_28596" WHERE "Denomination" = '00500 500 francs' AND "Location" = 'Sion'