Table schema:
CREATE TABLE table_name_57 (issue_price__bu_ VARCHAR, _clarification_needed_ VARCHAR, mintage__proof_ VARCHAR)

Question: What's listed as the Issue Price (BU) [Clarification Needed] with a Mintage (Proof) of 29,586?
SQL: SELECT issue_price__bu_[_clarification_needed_] FROM table_name_57 WHERE mintage__proof_ = "29,586"