The term 'mineral bonanza' refers to a large deposit of minerals, usually found in the form of a LODE. A LODE is an ore deposit that is formed within the fissures of rocks or veins, and is usually composed of valuable minerals such as gold, silver, copper, and lead. Mineral bonanzas are often found in areas with a high concentration of mineral deposits, and can be a great source of wealth for those who are able to exploit them.