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Historic Properties Treatment Plan, Collom Mine, Colorado 24 <br />was also used as a hammerstone on one end. The mano measures 10.5 x 8.9 x 5.6 cm. <br />Groundstone 6 is a sandstone metate measuring 42.0 x 33.4 x 15.2 cm with a single grinding <br />surface exhibiting moderate use. The grinding surface measures 16.0 x 13.0 cm. Groundstone <br />7 is a sandstone metate measuring 29.2 x 25.9 x 6.2 cm with a single moderately worn grinding <br />surface. Groundstone 8 is a sandstone metate fragment measuring 29.3 x 19.6 x 6.5 cm <br />with a single grinding surface. The grinding surface is moderately ground and pecked. <br />Groundstone 9 is a sandstone mano measuring 9.8 x 6.7 x 5.7 cm with two moderately worn <br />grinding surfaces. <br />The historic component of consists of a corral, five structures, and a historic artifact scatter. The <br />artifact scatter and the five structures probably were part of a mining operation, while the corral <br />most likely was used for sheep herding and is possibly less than 50 years old. The five <br />structures consist of three buildings of locally quarried stone and two deep holes. Feature 1 is <br />a structure of locally quarried sandstone dug 3 ft into the hillside. The walls are an average of <br />1 ft thick, and overall the structure is 13 x 15 ft. A single entrance occurs in the center of the <br />south wall. Though the walls have collapsed, the remains average 5 ft high. Feature 2 is <br />a dugout oriented east/west, with the entrance in the southeast corner. The eastern wall consists <br />of sandstone two blocks thick, with dirt and small rocks in between the two layers of stone. <br />Overall, the dugout measures 9 x 3 x 13 ft. Feature 3 is a large double -walled structure dug 3 ft <br />into the hillside. The walls average 3 ft thick, and the remaining portions are approximately 4 ft <br />high. The door is located in the northeast corner. Overall, the structure measures 12 x 12 ft. <br />Feature 4 is a deep depression in the ground next to the southeast corner and door of Feature 2. <br />The hole measures 10 x 10 ft and is at least 10 ft deep. The hole is filled with fencing and large <br />metal debris. The feature may be a caved -in portion of a cistern or mine shaft. Feature 5 is a <br />possible mine shaft with a 1.5 x 3.0 -ft opening. The shaft descends at a 45-50° angle to <br />an unknown depth; at least 20 ft can be seen from the opening. <br />The historic artifact scatter consists of bottles and cans concentrated immediately north of <br />Feature 2 and south of Feature 5. The historic artifacts include five sanitary cans (four measure <br />47599 TRC Mariah Associates Inc. <br />