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.
CNBC: Maryland 9th Most Expensive Place to Live. An average home in the DC suburbs will cost you half a million dollars, the cable network says. When comparing the costs of everything from real estate to red meat, Maryland is one of the most expensive places in the United States to call home, according to a survey of the 50 states by CNBC.