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29-95), SRT176 (3-29-95), SRT177 (3-29-95), SRT512 (10-12-95), SRT993 (10-12-95), <br />SRT995 (10-12-95), and SRT1648 (10-17-02) <br />Likewise, further information is necessary to officially determine the eligibility of four <br />sites which were recommended by archaeological consultants as eligible for the NRHP <br />more than twenty years ago: <br />SRT155 (Grand River Institute 9-1-79), SRT158 (Grand River Institute 9-1-79), SRT161 <br />(Grand River Institute 9-1-79), and SRT330 (Metcalf Zier Archaeologists 6-1-82) <br />Eleven of the sites recorded within the permit area have been officially determined <br />eligible for the NRHP by our office: <br />SRT30 (3-29-95), SRT32 (2-8-80), SRT185 (4-28-95), SRT345 (4-20-94), SRT938 (4-20- <br />94), SRT939 (4-20-94), SRT940 (4-20-94), SRT941 (4-20-94), SRT1368 (9-9-99), <br />SRT1369 (9-9-99), and SRT1370 (9-9-99) <br />On May 9, 1983 site SRT192 (the Foidel Canyon/Twentymile School) was listed on the <br />National Register. <br />Our office is particulazly concerned about the potential effects of underground mine <br />subsidence on the aforementioned sites within the permit azea. Sites SRT938 and SRT941 <br />aze particulazly at risk, in light of the significant damage mine subsidence has already <br />caused to the prehistoric rock art at sites SRT345, SRT939, and SRT940. However, the <br />potential effect of mine subsidence and other impacts related to the mining operation should <br />be determined for those sites identified within the area of potential effect (APE) which aze <br />eligible for or listed on the NRHP. The potential effect of the mining operation on each <br />potentially eligible (i.e. "need data") site should also be determined unless additional <br />investigation indicates that it is not eligible for the NRHP. <br />If azchaeological resources aze discovered during project activities, work must be <br />interrupted until the resources have been evaluated in terms of the National Register of <br />Historic Places eligibility criteria (36 CFR 60.4) in consultation with our office. <br />Thank you for the opportunity to comment. If we may be of further assistance, please <br />contact Greg Wolff, Section 106 Archaeological Compliance Coordinator, at (303) 866- <br />4674. <br />Sincerely, <br />.~.~~ ~~ <br />rrj Georgianna Contiguglia <br />~/ State Historic Preservation Officer <br />GC/GAW <br />