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.
Meanwhile, the only place in the U.S. to rank in the top 10 most expensive cities was New York City, which landed at number nine. Los Angeles came close behind as the 11th priciest city in the world.