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2023 Cultural Resource Site Assessments for Collom Expansion Project Colowyo <br />Tetra Tech June 2023 14 <br />For Official Use Only: Disclosure of Site Locations Prohibited (43 CFR 7.18) <br /> <br />Figure 8. Site 5MF.4003 overview, facing south. Taken by E. Shikrallah on 5/17/2023. <br />5MF.4006 – Rock Cairn, Needs Data <br />Site 5MF.4006 was originally recorded in 1995 by Metcalf Archaeological Consultants for the <br />Colowyo Coal Company Lease and Exploration Areas: Class III Cultural Resource Inventory. The <br />site consists of a rock cairn constructed with large sandstone rocks that has collapsed in the <br />middle. It measures 250 cm long by 175 cm wide by 80 cm tall. The stones are heavily coated in <br />green and orange lichen. The site has been revisited three times since the original recording. It <br />was revisited in 2001 by the BLM Little Snake Field Office, in 2005 by TRC as part of the Collom <br />Mine Expansion Class III Inventory project, and in 2015 by Tetra Tech as part of the Collom Mine <br />Expansion Site Assessment project. No new observations were recorded during any visitation. <br />In 2015, Tetra Tech revisited the site as part of the Collom Mine Expansion Site Assessment <br />project. The site still consisted of a collapsed rock cairn composed of lichen covered sandstone <br />rocks. The cairn was unchanged with no significant changes or impacts observed since the 2005 <br />recording. <br />In 2019, Tetra Tech revisited the site as part of the second round of assessments. The site <br />remained unchanged since the 2015 revisit. No mining related activities had affected the <br />collapsed cairn. Current mining activities were also not visible from the cairn location. Tetra Tech <br />recommended that mining activities continue to avoid the area until further assessment. <br />In 2023, Tetra Tech revisited the site as part of the third round of assessments (Figure 9). The <br />site remains unchanged since the 2015 revisit. No mining related activities have affected the <br />collapsed cairn. Current mining activities are also not visible from the cairn location. Tetra Tech <br />recommends that mining activities continue to avoid the area until further assessment.