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The majority of the structures in the downtown Calumet district were constructed in the years between 1880 and 1910 , when the copper mining industry was at its peak .
 organization: Calumet
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: Calumet 
Answer:
 organization: Calumet