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3.8.2 Alluvial Sand and Gravel <br />Alluvial sand, gravel, and cobble (pit run) are the primary commodity mined by MN4MMM <br />at the Three Bells facility. The minable material within the Veldman Property has been <br />depleted, and reclamation is ongoing. <br />In the Ditullio Property, the alluvial sand and gravel ranges in thickness from approximately <br />4 to 18 feet. The average deposit depth is 10 feet. Laboratory testing indicates the alluvial <br />deposit typically has less than 10 percent of material passing the number 200 sieve. <br />3.8.3 Bedrock <br />Bedrock was previously mapped in the area as the Upper Member of the Pierre Shale <br />Formation. Bedrock encountered in the area typically consists of sandstone and claystone. <br />Bedrock information for this area was determined from the Geologic map of the Boulder - <br />Fort Collins- Greeley area, Front Range Urban Corridor, Colorado(USGS MI 855 -G), <br />GEI Consultants, Inc. 11 June-January 20145 <br />Three Bells Mine Reclamation Permit Amendment <br />