++Red Mountain Mining (ASX: RMX)++ has announced it is working with a US-based advisory team on the final stages of a listing on the mid-tier OTCQB equity market.The listing builds on the company’s aggressive acquisition strategy that has seen it secure the ++Yellow Pine++, ++Utah++ and ++Silver Dollar++ antimony assets in Tier-1 mining districts adjacent to high-value, major developments such as Perpetua Resources' Stibnite project in Idaho and ++Trigg Minerals’ (ASX: TMG)++ Antimony Canyon project in Utah ...