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Table 1. Surveyed bank cubic yards (BCY) moved by draglines and [he <br />number of buckets Con recorded prime swings) required to move <br />the period 1919 through October 1981. <br /> Recorded Surveyed <br />Year Month Prime Swings Bank Cubic Yards <br />1979 January 44,172 1,250,832 <br />February 56,698 1,261,524 <br />March 51,194 1,333,396 <br />April 67,382 1,692,639 <br />May 61,890 1,236,480 <br />June 64,795 1,493,719 <br />July 83,626 2,193,284 <br />August 70,377 2,286,117 <br />September 66,941 1,544,264 <br />October 83,445 1,702,153 <br />November 60,899 1,468,426 <br />December 66,912 1,568,019 <br />1980 January 82,519 2,187,745 <br />February 75,469 1,601,135 <br />March 66,158 1,385,136 <br />April 61,063 1,544,572 <br />May 50,734 1,142,6f1 <br />June 41,076 879,286 <br />July 59,259 1,485,396 <br />August 44,019 1,191,005 <br />September 42,271 1,119,565 <br />October 66,015 1,543,290 <br />November 40,177 927,748 <br />December 59,123 1,261,479 <br />1981 January 57,931 1,416,957 <br />February 61,684 1,532,155 <br />March 60,526 1,338,922 <br />April 77,681 1,682,971 <br />May 57,988 1,292,425 <br />June 55,895 1,288,625 <br />July 62,459 1,397,819 <br />August 54,388 1,381,797 <br />September 30,963 741,758 <br />October 47,027 1,132,197 <br />2,032,756 48,511,447 <br />