2008-02-27_REVISION - M1981165 - Laserfiche WebLink

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f RE ~Q~® 3 2 ~~0~~ Mine Dev. Inc. MAR 0 3 2008 'Durc ~.,., Neglected Mine Project 3319E 4`~ Ave. Division os Recia~~nation, '~'ini~:~ ~ $m~~ Durango, Colorado 81301 Mining and safety ~ ~~~~~~~'~ Re: Technical revision request for permit number (M-1981-165). ~.1 G (s{rtr L'~ ~'~ ~ !J ~ r---- Dear Bob, l._ tom` I am rr~uesting a revision to our existing permits to include anon-toxic leaching process for the recovery of gold and silver and other metals from our ore. This process has been around for many years and was used successfully on the complex ores. It was deemed obsolete when cyanide came atong because of that cheep and easily obtained chemical, it has been resurrected and is recognized as the "new nod-toxic environmentally friendly answer for gold and silver extraction. Set out below is the example we used for our test work. here are m proprietary recipe secr+e.~ts in this example. The process is done by adding S00 gal. of water to a 1000 gal. tank to which 2000 lbs. of finely ;ground ore is added and mixed at slow speed. The starry is stirred while 40 Ibs of sodium: bromide and 801bs. of sodium chloride are added then .251bs. of potassium monopersulfa~te are added The oxidationlreduction potential is monitored and potassium persulfate is added to reach reder~tion potential of +800 millivolts. PH is monitored and kept at around 3.6. The slurry is stirred for 4-5 hours and the slurry is then filtered and the filtrate is pumped to a 750 gal holding tank and stirring is corrtinued. The precious metals are recovered by the addition of tedium borohydride and sodium hydroxide, and then the filtrate is filtered again to recover the metals that have been pn~ipitated. This metal residue will be washed and dlried and placed iffio proper cis and shipped to a for fiuti>ec refining. This metal residue will contain not only gold and silver but also any lead, copper, nicked and any plaRinums etc. "The filtrate sohrtion will then be pumped to a holding tank where it is stored and regenerated for recycling with the next batch of ore. The regeneration is done with a 500 amp r+ec~ifit~', by app13-ing4_ volts of dire~rt , to carbon plated el®ctrodes in the holding tank until the oxidationlreduction potential is + 800 millivolts_ The fiend is then pumped to the mixer tank and the process is started again, The tailings are washed, tested and cleaned of all of the leach solution and then pumped to ~~ existing lined pond this can be done without ever removing the tailings from the circuit. The water used to clean the tailings is then pumped to the holding tank to be added to the next batch of ore. It is cwt hope to mount the tanks, filters and equipment needed on a flat bed trailer and set it in a containment area lined and banned with the heavy duty liner. and constructed 1:o drain into the existing lined tailings pond- This system is considered an in- line closed cirrarit system, all ofthe tanks are enclosed and the fluids are contained The chemical storage will be approx. 200 lbs sodium bromide, SOO ibs sodieme ehloade,150 ~~~ d :,..