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.
And the worlds most expensive city is - WFSB 3 Connecticut. And the world's most expensive city is ... (CNN) - If there's any truth in the old saw that London's streets are paved with gold, it's probably because they've been gilded by cash stripped from the pockets of tourists.