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Project No. 7831 <br /> Silverton Standard Metals Field Evaluation Planting <br /> Progress Report - February 1982 <br /> .Introduction <br /> The site is located one mile east of Silverton on tailings pond number 2 at <br /> 9,700 feet (2910 m) elevation. The average daily high temperature for June, <br /> July and Auguat is 70' and the average daily low for the same period is <br /> 32°F. The recorded average frost-free period is 24 days. The average <br /> annual precipitation is 24 inches (60 cm) . However, evapotranspiration dur- <br /> ing May, June, July and August is greater than the precipitation. Precipi- <br /> tation during the same months are 1.4, 1 .6, 2.8 and 3.2 inches (3.5 cm, 1 .6 i <br /> cm, 2.8 cm and 3.2 cm), respectively. <br /> Evaporation rates on the site differ at the top of the tailings pond and on <br /> the slopes, as reported by Standard Metals measurements. The maximum <br /> measured on top was 0.54 inches (1.35 cm) in one day, compared to 0.25 <br /> inches (0.625 cm) on the tailing slope. <br /> The Silverton, Standard Metals plots were started in 1978. Additional plots <br /> were added in 1979, 1980, and 1981. This report contains information on the <br /> 1978 projects. Below is a outline of the different plots and will be used <br /> for further reference in this write up. <br /> Proj . No. <br /> 7831 Seeding Date Site 1/ Species Remarks <br /> A 6-21-78 I (Top) 53 shrubs transplanted <br /> 7 forbs transplanted <br /> B 6-22-78 I (Top) 22 grasses direct seeded <br /> 4 forbs direct seeded <br /> C 6-21-78 II (Slope) 39 shrubs transplanted <br /> 11 forbs transplanted <br /> D 6-22-78 II (Slope) 13 grass direct seeded <br /> 3 forbs direct seeded <br /> 1/ = Legend <br /> I. Top of tailing: The top flat area in the heavier stratified materials. <br /> This area is often saturated during winter and spring. These soils were <br /> classified as clay to silty clay loams with 5.6 to 5.7 pH. Soils <br /> analysis information is contained in table 1. <br /> II. Tailings slope plots: This area represents the dikes and steep outside <br /> Bout west acing s ope of the tailings. This material is fine grained <br /> (sandy) and is highly suceptable to both water and water erosion. The <br /> prelverized material is low in fertility but contain no appreciable <br /> amounts of minerals which might be toxic to plant growth. The fine <br /> sands have a 7.3 to 7.5 pH range and very rapid infleltration rate. <br /> Soil analysis is contained in table 1. <br />