Laserfiche WebLink
RULE 2 PERMITS <br />Collom – Rule 2, Page 77 Revision Date: 4/28/22 <br />Revision No.: TR-154 <br />Total Percentage of unsuitable material: <br />SAR = 19.9 feet/610.6 feet = 3.2590894202% <br />Se = 5.15 feet/610.6 feet = 0.84343268916% <br />B = N/A <br />Sat = 85.6 feet/610.6 feet = 14.018997707% <br />Mo = N/A <br />No Special Handling Procedures will be required for the overburden in the Collom Area (please see <br />Section 2.04.6 – Exploration Test Boring Results Summary). It was discussed between the Division of <br />Reclamation, Mining and Safety (DRMS) and Colowyo that suspect levels of the Sodium Adsorption <br />Ration (SAR), Selenium (Se), Boron (B), Saturation % (Sat), and Molybdenum (Mo) need to be <br />addressed in more detail to determine that Special Handling Procedures, that are outside the normal pit <br />operational procedures, will not be needed in the Collom expansion area. Review of the analysis <br />spreadsheets in Exhibit 6, Item 9 demonstrate minimal instances of analyses for pH, electrical <br />conductivity, nitrate as N and Acid-Base potential being outside of the suitable range for the four drill <br />holes analyzed above. <br />Based on similarities between overburden suitability analysis results in the Colowyo existing permit area <br />and the Collom permit expansion area, and on previous discussions between the Division and Colowyo, <br />suspect levels of Sodium Adsorption Ratio (SAR), Selenium (Se), Boron (B), Saturation percent (Sat), <br />and Molybdenum (Mo) will not need to be addressed in more detail to determine if Special Handling <br />Procedures, that are outside the normal pit operational procedures, will be needed in the Collom area. <br />Historically, beginning around 1983, Colowyo initiated overburden monitoring in both the pit <br />(truck/shovel materials) and on regraded overburden. See Exhibit 6, Item 4 as described in the associated <br />January 4, 1983 Colowyo memo to Dan Mathews (Division staff at that time), for an overview of <br />this initial program. Starting in 1990, Colowyo eliminated the in-pit sampling program. Sufficient <br />data had been collected to indicate that all weathered overburden material (ie within ~ 50 feet of <br />the ground surface) was suitable for replacement onto the reclaimed surface prior to topsoil <br />replacement. Three revisions were submitted to the Division and approved on January 24, 1984, <br />August 17, 1983, April 24, 1990, and PR-02 respectively. The following summarizes the <br />requirements of the current regraded overburden (backfill) sampling program and supersedes all <br />previous commitments. It is based on the following limitations of the earlier program. <br />1.Placing weathered overburden material onto reclamation areas prior to final regarding, and <br />2.Sampling regraded overburden at a density of one composite surface sample per 5 acres of <br />regraded spoil. <br />The regrading of overburden is an event that takes place sporadically during the year. Once backfill areas <br />are regraded, but prior to topsoil replacement, the new locations are identified and sampled. A life-of- <br />mine sampling grid has been established on 500-foot centers, and each sample location on the grid <br />corresponds to a letter/number combination as established on the sampling map. Using this grid interval, <br />each sample location represents an area of about 5.7 acres in size. A hand shovel is used to take small, <br />representative surface samples of spoil across the sample area.