Publisher's blurb: Four type of mine products: Metals (adamantine, mithril, platinum, gold, silver, copper, tin, iron) Stone (granite, basalt, marble) Gemstones (ornamental, semi-precious, fancy, precious, gems, jewels) Exotic materials (coal, petroleum and radio-active materials) Five type of environment: Mountain, Hill, Desert, Jungle, Plain. Volcanic Land. 26 races coming with their excavation rate.