Mining In Maine | The Diggings™
Maine has 788 identified mines listed in The Diggings™. The most commonly listed primary commodities in Maine mines are Silver , Copper , and Lead .At the time these mines were surveyed, 174 mines in Maine were observed to have ore mineralization in an outcrop, shallow pit, or isolated drill hole—known as an occurance mine. 1 Maine has 292 prospect mines. 2 319 mines were in production at,Maine Geological Survey: Mining and Quarrying - Frequently,,Feb 29, 2016· Tourmaline is the official State Mineral of Maine, and the most valuable and highly sought-after gem material that can be found here. Gem tourmaline has been mined in Maine since the 1820's, and the oldest location (Mt. Mica in Paris Hill) is still producing today. Tourmaline is actually a group of minerals having various colors and compositions.Maine Gemstones: tourmaline, amethyst, aquamarine, morganite,Other Maine Gems. In addition to tourmaline and quartz, the pegmatite deposits of Maine have produced aquamarine, morganite, chrysoberyl, lepidolite, spodumene, and topaz. Garnet, kyanite, andalusite, sodalite, and staurolite have been produced from the metamorphic rocks of Maine.