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_10259 ( "Rank" real, "Mountain Pass" text, "State" text, "Elevation" text, "Route" real )

### Question ###
What is the route that has a rank higher than 63, and Separation Summit as its mountain pass?

### Accurate SQL ###

SELECT SUM("Route") FROM table_10259 WHERE "Rank" > '63' AND "Mountain Pass" = 'separation summit'