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Rob Zuber <br />Page 3 <br />March 10, 2016 <br />68. In Volume 15, Rule 2, Page 13 the text reads "The Trout Creek sandstone underlies the lowest <br />surface recoverable seam to be mined at South Taylor (the G789 seams) by approximately 590 <br />feet" <br />Please revise this section of text to refer to the separation between the Trout Creek sandstone <br />and the lowest seam to be mined in the vicinity of the proposed Collom pit and use this value <br />consistently throughout the text of volume 15. Please also cite the data that allows CCC to <br />accurately assess the separation over this area. [Refer also item 80 in this letter] <br />This item has not yet been adequately addressed. The proposed text in Volume 15, Rule 2, <br />Page 13 continues to refer to South Taylor, which is not appropriate given that the PAP is <br />structured in such a way that volume 15 is specific to Collom. Furthermore the value given for <br />the vertical separation between the lowest seam to be mined and the Trout Creek Sandstone <br />on that page (590') is not consistent with information given on the following page. <br />69. In Volume 15, Rule 2, Page 16 a paragraph appears to have been inserted that is not relevant to <br />the Collom area: "Overburden and interburden samples from drill holes 97-06, 97-09..." <br />For clarity, please remove irrelevant text. <br />CCC removed the irrelevant text. <br />The response is sufficient. <br />70. Of the six drill holes that were sampled for overburden/interburden analysis, only one falls <br />within the 1.4 square mile (approximate) footprint of the newly proposed Collom pit (C-04-25). <br />The guidelines call for a minimum of 3 sampling locations with a spacing of approximately one <br />hole per square mile (from reference 1 below). In the geochemical analysis, CCC has also cited a <br />guideline published by the Wyoming Department of Environmental Quality (from reference 2 <br />below) which calls for an initial sample spacing of one hole per 80 acres (which is equivalent to 8 <br />holes per square mile). <br />The geochemical data from the six holes is presented in Exhibit 6, Item 9, and summarized in <br />table 2.04.6-7 and in the text. The data shows that hole C-04-25 contains a greater proportion of <br />unsuitable overburden material than the other five holes. For example: <br />a significant proportion of the overburden sampled at this point (27%) contains <br />Molybdenum at greater than 1ppm <br />the deeper horizons are notably high in Arsenic, with a maximum value of 39.8ppm <br />(compared to the WY DEQ criteria of <2.Oppm) <br />the deeper horizons also have elevated levels of Sodium, as indicated by the high SAR <br />values <br />