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ROBINSON <br />BRICK ~ <br />COMPANY ~ <br />~~~ <br />~~ <br />August 17, 2001 <br />Mc Larry Oehler <br />III IIIIIIIIIIIIIIII <br />999 <br />RECEIVE® <br />AUG 2 ; zcc~ <br />Reclamation Specialist Division of Minerals and Geology <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Permit Number: M-80-245 Hogback Mine <br />Technical Revision No. TR-2 <br />Bonding Calculations (Increase in Allowable Disturbance) <br />Dear Mr. Oehler <br />Further to our phone conversation today with regard to TR-2. Robinson Brick Company <br />( Robco) acknowledges the need to increase the bond due to our request to increase the <br />maximum allowable disturbance from 23.3 acres to 56.56 acres. <br />As Robco indicated in our letter dated July 17, 2001, TR-2 is designed to append to TR-1 <br />while not changing the reclamation plan approved in TR-1. The only changes proposed <br />in TR-2 are with regard to Staging and Allowable Disturbance. <br />Based on this, we have attached our proposed new bond totaling $236,538, a significant <br />increase from the current $54,000 bond amount. The new bond assumes that concurrent <br />reclamation will begin at the completion of Stage lwhen backfilling can occur as clay <br />mining progresses in both Stages 2 and 3. <br />Robco's new bond calculation indicates a maximum of 330,000 yd3 would require <br />backfilling and/or rehandling up and until this point of time, afrer this, concurrent <br />reclamation will essentially mairaair, these quantities in equilibrium. <br />Please call me at (303) 783-3040 if you have any questions. <br />Regards, <br />Mark S. Chalmers P.E. <br />Mining Manager <br />Enclosures: <br />1895 West Dartmouth Avenue Denver, Colorado 80110-1308 <br />Sales (303) 783-3000 Toll Free (800) 977-9002 Fax (303) 781-1818 <br />Web-site: www. robinsonbrick. com <br />