Laserfiche WebLink
May Day Idaho Mine Complex 112 (d) Permit Application <br /> Zn <br />2-20 pH , alkalinity, sulfate, Ca, Fe, K, Mg, Na Ever y 2 weeks <br />2-20 Al, As, Zn Ever y 4 weeks <br />20-52 PH , alkalinity, sulfate, Ca, Fe, K, Mg, Na Ever y 4 weeks <br />20-52 Al, As, Zn Ever y 8 weeks <br />52+ pH , alkalinity, sulfate, Ca, Fe, K, Mg, Na, Al, As, Ever y 8 weeks <br /> Zn <br />Additionally, several surface water sampling locations are immediately down gradient of <br />several mine rocks and tailings locations which provide an assessment of potential <br />impacts to surface water. <br />(c) Intended Use <br />The mine rock was analyzed for characterizing the material for its suitability to be <br />disposed within dry stopes of the mine workings. <br />(d) Fate of Material <br />A detailed geochemical analysis of the mine rock material is provided in Attachment T-7. <br />The results are summarized below: <br />SiO2 and A12O3 dominate the oxides, indicating that the sample is felsic in nature, <br />with Ca and K the dominate alkali and alkaline earth metals. Sulfur <br />concentrations as determined by XRF (1.10%) is similar to that determined by <br />combustion (1.75%). Zinc was the dominate trace metal (684 ppm). <br />The paste pH of the mined rock is 7.5. The Neutralizing Potential (62.2 kg/ton) <br />is greater than the Acid Potential (54.6 kg/ton) producing a positive Acid-Base <br />Potential (7.55 kg/ton). <br />SPLP analytical results were compared to both groundwater and surface water <br />basic standards. For surface water, the Chronic Aquatic Life Standard was used <br />as it was assumed that the leaching of any rock would occur over long periods of <br />time rather than an immediate release. The only analyte above any of the Basic <br />Standards was Arsenic (0.0151 mg/L) which was 10% above the Domestic Water <br />Supply- Human Health Standard (0.01 mg/L). However, as described in <br />Section 6.4.20(8), there is no pathway to drinking water. <br />An additional representative whole rock humiditv cell leaching study will be <br />undertaken using ASTM method D5744-08. The study will be undertaken <br />in consultation with DRMS as outlined in Second Preliminary Adequacy <br />Issues for a 112(d)-1 Application letter dated March 29, 2011 signed by Mr. <br />David Bird. <br />REVISED June 5, 2011 <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />15 <br />