Prime Minister Anibal Torres said during a conference between executives of large mining firms that the new "attitude" aimed to promote local and foreign investment.
Some buyers have said they are shunning Rusal's metal, while others are securing price discounts at the same time as the industry negotiates supply deals for 2023.
Glencore put zinc sulphide operations at the Portovesme plant on care and maintenance in November 2021, but continued production of zinc recycling and lead.