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2023 Cultural Resource Site Assessments for Collom Expansion Project Colowyo <br />Tetra Tech June 2023 26 <br />For Official Use Only: Disclosure of Site Locations Prohibited (43 CFR 7.18) <br /> <br />Figure 17. Site 5MF.6098 overview from historic component, facing northeast. Taken by E. <br />Shikrallah on 5/16/2023. <br />5MF.6116 – Rock Cairn, Needs Data <br />Site 5MF.6116 was originally recorded in 2005 by TRC as part of the Collom Mine Expansion <br />Class III Inventory project. The site is reported as a collapsed rock cairn consisting of <br />approximately 50 unshaped tabular sandstone slabs. The collapsed cairn covers an area of about <br />2 m by 1 m in size. No artifacts or other evidence to suggest temporal or cultural affiliation were <br />recorded in association with the cairn. <br />In 2015, Tetra Tech revisited the site as part of the Collom Mine Expansion Site Assessment <br />project. The cairn appeared to be in identical condition as in 2005, with no new findings observed <br />at the site. The only notable changes were continued sagebrush growth, which had not adversely <br />impacted the cairn. <br />In 2019, Tetra Tech revisited the site as part of the second round of assessments. The cairn <br />appeared to be in identical condition as reported in 2015 with sagebrush growth continuing, but <br />not yet adversely impacting the cairn. Mining activities had not impacted the cairn and were not <br />visible from the cairn. Tetra Tech recommended that mining activities continue to avoid the area <br />until further assessment. <br />In 2023, Tetra Tech revisited the site as part of the third round of assessments (Figure 18). The <br />cairn appears to be in identical condition as reported in 2019 with sagebrush growth continuing, <br />but not yet adversely impacting the cairn. The topmost portion of the mining topsoil pile is visible <br />from the cairn to the southeast (Figure 19). However, the change in the site viewshed is not <br />significant and is not impacting the site setting. Mining activities have not impacted the cairn. Tetra <br />Tech recommends that mining activities continue to avoid the site until further assessment is