Table: royal_canadian_mint_coins_3
Columns: year
park
artist
mintage
issue_price

Question: What is the lowest mintage in a year earlier than 2005?
SQL: SELECT MIN("mintage") FROM royal_canadian_mint_coins_3 WHERE "year" < 2005

Question: What is the sum of all mintage created by Pierre Leduc?
SQL: SELECT SUM("mintage") FROM royal_canadian_mint_coins_3 WHERE "artist" = 'pierre leduc'