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.
In Depth: Americaâs Most Expensive Cities. Behind the Numbers. To determine the U.S. cities where the cost of living is highest, the London office of Mercer, an American human resources consulting company, earlier this year measured the prices of the same basket of goods in 253 of the worldâs cities.