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.
Singapore has retained its position as the world's most expensive city, according to research by the Economist Intelligence Unit (EIU). The top five most expensive cities in the world remain unchanged from a year earlier and include, in descending order, Paris, Oslo, Zurich and Sydney.