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.
Here, we've highlighted the 11 US cities that broke into the top 50 and the cost of living index for each. For reference, the average cost of living index of all the cities surveyed is 71.5 â the most expensive city in the world, Singapore, has an index of 116 and the cheapest city, Lusaka, has an index of 41.