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Geochemistry Review 4 25 March 2011
<br />May Day Conversion CN-1 File No M-1981-185
<br />discontinue the test. Specific parameters of the test are shown in the table below. As the long-
<br />term results of these humidity cell tests will have a bearing on the technical practicability of the
<br />underground disposal option, the operator should commence the test as soon as possible. The
<br />Division will not allow any permanent underground disposal of tailings until at least one year's
<br />worth of data have been produced from the humidity cell test.
<br />The following table provides the humidity test protocols for analytes and frequency of analyses.
<br />The operator must refer to ASMT method D5744-07 for the required testing methodology. As
<br />this is a standardized ASTM test, there are certified laboratories available that have the
<br />capability and expertise to conduct this type of test.
<br />Week Parameters Fre quency
<br />0 H, alkalinity , sulfate, Ca, Fe, K, Mg, Na, Al, As, Zn
<br />1 H, alkalinity , sulfate, Ca, Fe, K, Mg, Na, Al, As,Zn
<br />2-20 H, alkalinity , sulfate, Ca, Fe, K, Mg, Na Eve 2 weeks
<br />2-20 Al, As, Zn Eve 4 weeks
<br />20 - 52 H, alkalinity , sulfate, Ca Fe, K M Na Every 4 weeks
<br />20 - 52 Al, As, Zn Eve 8 weeks
<br />52+ H, alkalinity , sulfate, Ca, Fe, K, Mg, Na, Al, As, Zn Eve 8 weeks
<br />19) Attachment T-5, Surface Water Sampling Results. The Applicant should make the following
<br />revisions to the surface water sampling and monitoring plan:
<br />1 - Add to dissolved analyte list: Aluminum, Iron
<br />2 - Add to total recoverable analyte list:
<br />A - Molybdenum
<br />B - Cyanide (the WQCC regulations are in terms of free cyanide, but the operator
<br />may analyze for WAD cyanide if they choose).
<br />C - Total organic carbon
<br />3 - Switch from dissolved to total recoverable: Barium, Beryllium, Boron
<br />20) A. Attachment T-7, Mine Rock Geochemical Analysis. Please comment on the
<br />representativeness of the rock subjected to SPLP testing, i.e., the location(s) from within the
<br />mine the rock was collected.
<br />B. The ANP:AGP ratio is only 1.14 to 1, and represents only one sample. Considering that this
<br />ratio does not provide an overwhelming proportion of acid-neutralizing material, in conjunction
<br />with the fact that data from only one sample have been provided, the Division requires more
<br />comprehensive static testing of material that could ultimately be disturbed, exposed, and/or
<br />stockpiled. This will begin the establishment of a data set and screening parameters for
<br />possible future kinetic testing. Please provide a plan for more comprehensive sampling and
<br />static testing, to be implemented subsequent to the issuance of CN-01.
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