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• Table 1 Summary of auger probing site number probes comments SLA7003 10 probes @ 10 m intervals one probe recovered a gray felsite flake tool, another probe across southeast edge of site had a piece of rabbit-sized long bone of unknown age or origin; additional testing warranted SLA7186 6 probes @ 10 m intervals four of six probes positive for prehistoric cultural materials across site west of adobe (all flakes), four of six probes positive for historic materials structure (metal, glass, ceramics, bone), Holocene sediments over 2 m deep in some places; additional testing warranted SLA7187 10 probes @ 10 m intervals probes to 170 curbs in places, four probes positive with through site and extending to historic materials, no prehistoric materials; no further work west-southwest out of site SLA7196 20 probes @ 5 m intervals in four probes positive for cultural materials (6 Flakes, t biface two intersecting transects fragment), three clustered in area of surface artifact concen- tration, probes averaged 30 cm deep, Holocene sediments up to 70 to 80 crabs in places; additional testing warranted SLA7208 21 probes @ 5 m intervals in one positive probe (I flake, I flake tool), near surface con- two trartsects centration exposed by plowing, Holocene sediments up 1 m or more in places; additional testing warranted • Non-site 16 probes @ 10 m intervals in one positive probe (I flake), probe line on TI terrace, one transect probes to 160-180 curbs, base of Holocene sediments not reached; additional testing warranted investigations aze to assist in describing the Holocene sediment history of the project azea, with emphasis on identification of deposits with archaeological potential and description of the sedimentological history of those deposits. Of particulaz concern aze the alluvial and colluvial valley floor sediments in Lorencito Canyon and the other major drainages, since archaeological investigations indicate that features and artifacts aze fairly common in these deposits but difficult to find due to the well-sealed nature of the deposits, lack of ground visibility, and the depth of the deposits. Ittitial results of an eight-day field session suggest that there aze Quaternary sediments young enough to yield buried cultural material within the boundaries of the proposed mine. These consist of remnants of three alluvial terraces in the arroyo drainages, colluvium intercalated with and deposited on the terraces, and colluvial sediments mantling higher elevation structural benches. The potential of these landforms to yield buried cultural materials differs according to their age. Relative age-dating of pedogenic properties (Birkeland 1984; Birkeland et al. 1991; . McFaul et al. 1994) and comparisons with other dated landforms in the Purgatoire River drainage (McFaul and Reider 1990; McFaul 1990) suggests that the lower two terraces have the highest