Placer refers to a type of mineral deposit that is formed by the accumulation of valuable minerals, often through the action of water. These deposits typically contain precious metals like gold and silver, which have been eroded from their original source and transported by rivers or streams. Miners often search for placer deposits in riverbeds, beaches, or other sedimentary environments. Placer mining is the process used to extract these minerals from the deposits. This method can involve simple techniques, such as panning, or more complex operations using machinery. The goal is to separate the valuable minerals from the surrounding sediment and gravel.