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The piles of rock waste on the former mine sites have proved to be ideal breeding grounds for rare plants , and have resulted in the designation of part of the forest as a Site of Special Scientific Interest ( SSSI ) .
 Site of Special Scientific Interest
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Site of Special Scientific Interest