The mining activities at the deeper levels in Kolar goldmines became uneconomic as early as the 1980s due to depletion in the high grade ore reserves . कोलर की स्वर्ण खदानों में गहराई में खनन का कार्य 1980 के दशक में ही उच्च स्तर के अयस्क भंड़ार में कमी के कारण फायदेमंद नहीं रह गया था .
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