Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17259 ( "Year" real, "Theme" text, "Artist" text, "Mintage (Proof)" text, "Issue Price (Proof)" text, "Mintage (BU)[ clarification needed ]" text, "Issue Price (BU)[ clarification needed ]" text )

### Question ###
What is the mintage (bu) with the artist Royal Canadian Mint Staff and has an issue price (proof) of $54.95?

### Accurate SQL ###

SELECT "Mintage (BU)[ clarification needed ]" FROM table_17259 WHERE "Artist" = 'Royal Canadian Mint Staff' AND "Issue Price (Proof)" = '$54.95'