Castillo Copper Limited (ASX: CCZ), formerly known as Oakland Resources Limited, is a base metal explorer primarily focused on copper, with secondary interests in zinc and nickel. The company's core operating assets are located in eastern Australia, highlighting its strategic focus on exploring and potentially developing base metal resources in this region. Castillo Copper aims to leverage its exploration efforts to identify and advance significant copper, zinc, and nickel projects, contributing to its growth and presence in the base metals sector.