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<br />Coulson Excavating Company, Inc. -Bonser Gravel Pit
<br />Exhibit D -Mining Plan
<br />Background and Procedure
<br />The Bonser gravel pit will be operational for 15 years. Overburden removal will begin one year after
<br />permitting, with gravel removal starting 30 to b0 days thereafter. Mining operations will follow standard
<br />gravel pit mining procedures, and the processing of gravel will take place on site. A crusher and screening
<br />facility will be conveyed to the Bonser mining pit when operation begins, and an asphalt plant will be
<br />brought in approximately six months after start-up. Placed on the western boundary of the mine, these
<br />facilities will also be accompanied by a scale house. Raw material stockpiles will be placed south of the
<br />asphalt planUcrusher facility, measuring approximately 130 - 160 R. in diameter and 20 - 40 ft. in height.
<br />The mine will be divided into three equal sections, each pit measuring approximately 112,772 ydr, in
<br />which mining will take place for 5 years. Roughly 43,273 yd3 of topsoil, 50,835 yd3, and 94,107 yd3 of
<br />overburden (topsoil plus subsoil) will be removed from each pit; and approximately 886,530 tons of
<br />gravel will be extracted from each pit (Table 1). An average of 177,306 tons of gravel will be extracted
<br />from the mine each year, totaling 2,659,590 tons over 15 years. Mining will begin at the southern
<br />boundary and move towards the north.
<br />Tablel
<br />Duration Topsoil Removed Subsoil Removed Overburden removed Gravel Extracted
<br />Pit 1 5 yrs. 43,273yd3 50,835yd3 94,108 yd' 886,30 tons
<br />Pit 2 5 yrs. 43,273yd3 50,835yd3 94,108 yd3 886,530 tons
<br />Pit 3 5 yrs. 43,273yd3 50,835yd3 94,108 yd3 886,530 tons
<br />TOTAL 129,819yd3 152,505yd3 282,324yd3 2,659,590 tons
<br />Mining Operations and Timetable
<br />Each pit will be operational for five years, beginning with pit 1. Overburden removal, grave] extraction,
<br />pit lining, and backfilling will take place before proceeding to the next pit. Located on the northern
<br />boundary of each cell, overburden stockpiles are to measure approximately 20 - 30 ft. high, 2,100 ft. long,
<br />and 40 = 60 ft. wide. After gravel is removed, approximately 63,500 yd3 of weathered Pierre shale w~l] be
<br />used to construct a 2 ft. thick liner, and stockpiles will be backfilled into the pit from which they were
<br />taken. Table 2 illustrates the operations summary.
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