Ancillary mining involves the extraction of minerals that are not the primary target of a mining operation. Synonyms for this term may include secondary mining, byproduct mining, or associated mining. These methods often involve the extraction of other valuable materials found within the same deposit, such as gold or copper found alongside silver. In some cases, ancillary mining may also refer to the extraction of non-metallic minerals, such as aggregates or building stone. This type of mining can provide an additional source of revenue for mining companies and can also help to minimize waste by utilizing all available resources.