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~ ~ III IIIIIIIIIIIII III VRANESH ANO RAISCH, LLC ATTORNEYS AT LAW JERRY W. RAI6CH 1)20 191 6TREET~ SUITE 200 GEORGE I~RANE6H (RETIRE DI JOHN R. HENDE RSON MICHAEL D. SHIM MIN P. O. BO%B)I GREGORY J. CLIFTON/~ EUGENE J. RIO ROAN BOULDER, COLORADO 80306 TNOMAfi MORRIS P4UL J. ZI L15 DOUGLAS A. GOULDING TELE PHONE J03/493-6151 TELECO PIER 303/443-9566 L1 ( y ~A p October 24, 1994 - x°~ ,.r~R C~I~`~D "'1 '„r °' c,~- )" \~`' ~~ o ,~~k,/~ ~ ~ OCT 25 1994 ~.~'~, ~~'`~ Mr. William York-Feirn / _ Division of Minerals and Geology ~ DiwsionOfMinerals& e~y \ k° Department of Natural Resources / ~y ~,,rp` 1313 Sherman Street, Room 215 ~Q ~r~~ ~ 50.x' Denver, CO 80203 \ ~~p`u ,tea Qr~ ~ _ RE: Hendricks Mining Co. -- ~ ~-` L nnnq~' n Cross Mine Permit Area, Boulder County, Colorado ~ ~ Dear Bill: ~~~ ~~ Attached please find some of the key test data from the Cross Mine ores, including whole rock analysis of the he~id and tail samples, acid-base accounting and humidity cell testing. I am also sending along at this time the extensive quality control report included by Core Laboratories. Core also provided us with a more complete quality control report dated October 6, 7.994, which I also enclose for your reference. We believe that our ores show a very high ratio of z\cid neutralizing to acid generating potential, which is what we have always maintained about the Caribou District. We have four known mine flows in the District from the Caribou portal to they area east of the Boulder County Mine. All have pH values of <<round 7. We also find very low quantities of pyrites in the Cross and Caribou type ores, and substantial amounts of carbonates. i~ We do believe there to be one "transient" in the Dice ~Q~~~ element analysis. The trace element analysis shows aril\m at .15 e ppm. We have never detected barium in the mine afte re~ sampled our water flows for over a decade. We have no known '~ occurrences of barite or other barium minerals in the mine. We (,~ ~" suspect that some form of contamination was present in tYie p~ y, laboratory. If necessary, we should retest for this element in ~,,r+-v-' the procedure. We would be most interested in the standards being L\sed by the Division to determine candidates for DMO status under the new statute. As only a few mines have prepared this type of study, we would be interested in the standards developed by you for assessing the potential for acid generation, and resultant heavy metal mobilization. We, of course, have always taken the: 6\h endriclmckinnon\letters\feirn{r