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from Schmidt would likely be the best route to update the Land Board files so the State can become <br /> familiar with what is expected in the future and what was done in the past. <br /> MINING ACTIVITY IN THE LAST YEAR: <br /> 1. Depth of mining- In the last year, mining depths were consistent and reached down to <br /> considerable depth,but well within the maximum. Overburden production in the last year was <br /> less than has been the case in the past couple of years. In fact, the amount of overburden in <br /> stockpiles declined considerably as backfilling in mined out and unusable portions of the pit <br /> has begun. There is still plenty of fill available to properly backfill the pit. The overburden is <br /> being stockpiled adjacent to the mining area so backfilling can be done easily and <br /> economically. All mining was in compliance with the depth requirements. Soil was salvaged <br /> as required. The pit as a whole primarily expanded to the north along the eastern edge of the <br /> mining limit. That limit is identified by the presence of fence posts placed along the edge of <br /> the mining area. These posts are not connected by wire,but only act as markers. <br /> 2. Backfilling- A small amount of backfilling of the current mining area was done in the last <br /> year. Most of the backfilling occurred in the reclamation area. <br /> A. Depth of backfilling- The pit that was filled at the current mining area was, on <br /> average, about 12 feet deep. Mining in this area did not go to full depth due to the <br /> presence of high quantities of clay. Backfilling at the reclamation area was up to about <br /> 10 feet,but over most of the reclamation area backfilling was mostly a superficial <br /> evening out of the topographic variability to create a more or less rolling topography in <br /> this area that was judged similar to adjacent lands to the south. It has always been <br /> thought that the grading to the north of the reclamation area did not introduce enough <br /> of the subtle rolls. It is fine as it is, but it might have looked a little better if had a little <br /> more topographic variation. <br /> B. Material used in backfilling- Backfilling at the current mining pit primarily used <br /> overburden plus some wash fines from the processing plant. Deeper backfilling at the <br /> reclamation area primarily used wash fines from the processing plant,but the very <br /> large overburden and soil stockpile that was at the toe of this area was also used to <br /> remove stronger topographic features that did not fit the expected appearance of land at <br /> this location. <br /> C. Maximum, minimum, and average slopes- Finished slopes in all the backfilled, <br /> graded and topsoiled areas are rarely even close to the 5:1 limit over the entire slope. <br /> Localized spots where a rolling feature is created may have a short outslope that <br /> exceeds 5:1,but this is preceded by a very gradual transitional inslope that is far less <br /> steep than 5:1. Most backfill areas are in the 7:1 to 15:1 or less steep range. This is <br /> consistent with natural variations on adjacent lands. The backfilled land in the mining <br /> Status report for 2014 due July 15, 2014 Page 4 of 10 <br />