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_3438 ( "Stage" real, "Winner" text, "General Classification" text, "Mountains Classification" text, "Sprint Classification" text, "Team Classification" text )

### Question ###
What is the earliest stage where mountains classifications was awarded to Peter Stetina?

### Accurate SQL ###

SELECT MIN("Stage") FROM table_3438 WHERE "Mountains Classification" = 'Peter Stetina'