150803
The Hulbert Mining Company had two subsidiaries : the Calumet Mining Company , established in 1865 , and the Hecla Mining Company , spun off the following year .
 Mining, Calumet Mining, Hecla Mining
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mining, Calumet Mining, Hecla Mining