CREATE TABLE table_17259 ("Year" FLOAT, "Theme" TEXT, "Artist" TEXT, "Mintage  ( Proof ) " TEXT, "Issue Price  ( Proof ) " TEXT, "Mintage  ( BU ) [ clarification needed ]" TEXT, "Issue Price  ( BU ) [ clarification needed ]" TEXT)

What is the mintage (bu) with the artist Royal Canadian Mint Staff and has an issue price (proof) of $54.95?
SELECT "Mintage (BU)[ clarification needed ]" FROM table_17259 WHERE "Artist" = 'Royal Canadian Mint Staff' AND "Issue Price (Proof)" = '$54.95'
SELECT "Mintage (BU)[ clarification needed ]" FROM "table_17259" WHERE "Artist" = 'Royal Canadian Mint Staff' AND "Issue Price (Proof)" = '$54.95'