2010-03-22_INSPECTION - M1997014

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(Page 2) MINE ID # OR PROSPECTING ID #: M-1997-014 INSPECTION DATE: 3 March 2010 INSPECTOR'S INITIALS: M39 OBSERVATIONS This inspection was conducted on 3 March 2010 by David Bird of DRMS. Also present during the inspection representing the operator were Connie Davis, Land Advisor; Chris Pilmer, Operations Manager; and Kipp Raines, Site Manager. The Deer Creek Quarry is a 112(c) construction materials mine located in Jefferson County about 3 miles west of Kipling Street on Deer Creek Canyon Road. Commodities of interest mined at the site include granite and granite gneiss, borrow material, and crushed stone material. The total permit area is listed as 75 acres. The Division holds a bond in the amount of $252,500 for the operation. The post-mining land use is described as general agricultural. The mine was inactive at the time of the inspection, and only operates intermittently during the year depending on demand for the specialty products mined at the site. In general the site is in good condition for one that sees such limited activity. The configuration of the mining area has changed little since the last Division inspection on 6 May 2004. The mining is proceeding at a very slow rate and in accordance with the approved mining plan. Due to recurring vandalism and theft, the operator removed most of the infrastructure and facilities. Only a small shed, the scale platform, two power poles and other minor miscellaneous structures remain. No mining equipment is present on site. Only one problem was observed on the ground that requires attention. The sign required by Rule 3.1.12 of the Construction Materials Rules and Regulations was missing. This problem and the necessary corrective action are described on page 3 of this report. Another potential problem on the ground worth noting is the potential offsite damage that could occur if storm runoff and erosion are neglected. Numerous ruts are present on the rarely used roads at the site, indicating erosion and sediment transport during precipitation and snowmelt. However, the operator noted that Mr. Raines conducts monthly inspections of the site and implements remedial measures to the runoff retention areas as needed. DRMS recommends continuing these activities, as they appear to be successful in preventing offsite damage. To assess the effect of inflation, the Financial Warranty was recalculated based on the same task structure as for the last calculation performed by the Division in 2004. Due to inflation and some minor omissions on the last calculation that have been corrected, the Financial Warranty will increase by $81,900 to $334,400. This is included as a problem on page 3 of this report. I & E Contact Address NAME: OPERATOR: Connie Davis Aggregate Industries - WRC, Inc. STREET: 1707 Cole Blvd., Ste 100 CITY/STATE/ZIP: Golden, CO 80401 cc: r' CE I' B LM r USFS r HW F HMWMD r OSE F WQCD F OTHER