Contractors, especially those involved in industrial maintenance or laboratory clean-outs, often generate waste that includes used materials, contaminated tools, and scrap metal residues. These can contain traces of precious metals, especially if the work involved electronics, dental materials, or plating. Although often overlooked, this waste can be valuable when properly sorted and processed. Items are usually weighed, homogenized, and sampled before refining. Responsible disposal ensures not only compliance with environmental regulations but also allows for the recovery of high-value materials.