The scrap metal industry has become a crucial contributor to the reuse/recycle trends of recent decades. In the United States alone, 250 billion pounds of scrap metals are recycled or shipped to other countries for recycling, annually. The reason for the high demand for recycled metals is simple. Reworking used metals for recycling is less expensive than mining and refining new metals. The expensive machinery, plus the substantial manpower, energy, and transport costs needed to convert virgin ores add up to a far greater investment. Metals like copper, aluminum, and stainless steel maintain their properties after multiple recycles. Alloys like bronze or brass can be reborn and used for very specific purposes.