What is the mintage for a location of Sion and a denomination of 00500 500 Francs?
CREATE TABLE "later_thalers_with_event_location_and_ye" (
  "location" text,
  "date" real,
  "denomination" text,
  "coinage_metal" text,
  "mintage" real,
  "km_number" text
);
SELECT "mintage" FROM "later_thalers_with_event_location_and_ye" WHERE "location"='Sion' AND "denomination"='00500 500 francs';