Constantine Metal Resources Ltd., a junior mining company, engages in the exploration and development of mineral properties in North America. The company primarily explores for copper, zinc, gold, and silver deposits. Its principal project is the Palmer project that includes 340 federal mining claims and 63 state mining claims located in Alaska, the United States. The company was incorporated in 2006 and is headquartered in Vancouver, Canada. As of November 1, 2022, Constantine Metal Resources Ltd. operates as a subsidiary of American Pacific Mining Corp.