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.
San Francisco ranks as the 2nd most expensive in the U.S., and also has higher cost of living than international cities of Sydney, Hong Kong and Milan. San Francisco ranks as the 2nd most expensive in the U.S., and also has higher cost of living than international cities of Sydney, Hong Kong and Milan. 2. San Francisco.