1. mirny diamond mine, serbia siberia
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2. kimberley big hole - south africa
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3. glory hole - monticello dam
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4. bingham canyon mine, utah
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5. great blue hole, belize
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6. diavik mine, canada
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7. sinkhole, guatemala
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v=02. kimberley big hole - south africa
v=03. glory hole - monticello dam
v=04. bingham canyon mine, utah
v=05. great blue hole, belize
v=0v=06. diavik mine, canada
v=07. sinkhole, guatemala
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