Mineral resource classification is the classification of mineral deposits based on their geologic certainty and economic value.
Here's a list of the top 10 most expensive cities in the country, ranked by average monthly rent for a single person: 1. San Francisco, $2,077. 2. New York City, $1,994. 3. Boston, $1,721. 4. Washington, D.C., $1,397. 5. Seattle, $1,288.
Following is a look at each of the 10 most expensive cities in the United States. 1. Manhattan, New York. Manhattan, New York, once again ranks as the most expensive place to live in the U.S. The city in 2012 had cost of living index of 225.4 -- more than double the national average.