37874
In the Powder River Basin approximately 27 to 54 billion tons of coal burned within the past three million years .
 location: Powder River Basin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Powder River Basin 
Answer:
 location: Powder River Basin