Pennsylvania, which is where I am from, mines a lot of the mineral limestone. It is used to make cement and other useful building materials. It is very important in building houses and roads which you use every day. For example, some famous buildings such as the Empire State Building in New York City were made from Pennsylvania limestone. Limestone is also used in farming as a fertilizer to improve the soil. Limestone is mined by surface mining. In Pennsylvania, the Allegheny Mineral Corporation is one company that mines limestone. Limestone is a valuable mineral. It provides jobs at quarries and brings money to Pennsylvania. Quarries in Pennsylvania export limestone to other states and countries. Pennsylvania and the US rely on mineral mining. In 2010, the minerals mined in Pennsylvania were worth $6.25 billion. That is a lot of money and Pennsylvania is just one of the fifty states in the USA. As you can see, Pennsylvania has gotten very lucky with the minerals and other natural resources it produces.