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.
1. Tokyo, Japan. Despite a weakening yen and the accompanying drop in the relative cost of living, Tokyo once again earns the distinction as the world's most expensive city. The Japanese city has held the spot for 14 of the last 20 years, said survey author Jon Copestake.