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.
The 10 most expensive cities in the world. 1  Mar.  An island nation slightly smaller than New York City and Hong Kong remains the world's most expensive city for a second year in a row, according to the Economist Intelligence Unit's (EIU) bi-annual Worldwide Cost of Living report.