Priorities and Development Trends of the Mining and Metallurgical Complex in the Republic of Kazakhstan The mining and metallurgical complex (MMC) plays a crucial role in the economy of the Republic of KaCreate free account or login to read this article. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.