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.
New York was the worldâs most expensive city including rent as of April 2015, according to a new analysis by UBS. KENA BETANCUR/AFP/GETTY IMAGES. New York City takes the top spot in the annual ranking of the worldâs most expensive cities, according to an analysis by UBS.