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2009-03-12_REVISION - M1978222UG
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2009-03-12_REVISION - M1978222UG
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Last modified
6/15/2021 5:55:47 PM
Creation date
3/23/2009 8:27:33 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1978222UG
IBM Index Class Name
REVISION
Doc Date
3/12/2009
Doc Name
Response to preliminary adequacy review
From
O&G Environmental Consulting, LLC
To
DRMS
Type & Sequence
CN1
Email Name
GRM
Media Type
D
Archive
No
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Nuvemco, LLC's Monogram Mine M-1978-222UG <br />Response to Preliminary Adequacy Review <br />March 10, 2009 <br />7) Appendix E, well construction and test report for well MMW 1. The satne general questions for MMW2 <br />also apply to well MMW 1. Was the assumption that 10 R of screen below the SWL would be sufficient for <br />sampling? <br />There were no indications of water during drilling. Even when we lowered a weighted tape to <br />confirm depth of borehole, no water was indicated. Based upon samples, we believed that the <br />best chance for finding seasonal water would be in the continuous sand from 200 to 300 feet. <br />We set the screen from 270 to 300 feet with a 10 foot sump. We placed sand in the annulus from <br />250 to 310 feet. As described in the supplemental geologic log, we encounter difficulties in <br />setting a bentonite seal above the sand pack. Apparently the annulus plugged off and an <br />alternative fracture or mine was penetrated. When measuring the depth of the inside of the <br />casing some water had entered and a static water level of 290 feet was established at the same <br />time. No indications of water were present before that or the screen might have been set lower. <br />No assumptions were made about purposely setting the screen 10 feet below the SWL. We <br />believed we were completing another dry well. <br />8) Exhibit T. "The current configuration of the mine area has precipitation draining off the cliffs on the east <br />side or draining into the pit area." Cliffs? Is it directed off site or back into the pit area? <br />As shown on Exhibit T - Figure T-1, the current water divide on top of the knob directs <br />precipitation both into the pit and in essentially all directions. Much of the flow to the east does <br />proceed off very steep slopes with some cliff faces. The natural flow off this hill/knob is and has <br />been off site towards the Paradox Valley. <br />Nuvemco's mining efforts of the Monogram Pit and Knob will effectively reduce offsite flow by <br />mining the pit first which directly runoff in that direction where a retention berm will be <br />established. As the adjacent "knob" is mined, the pit is enlarged and the berm maintained to <br />control runoff. When the ore is finally removed a smaller, lower hill will be contoured out of the <br />replaced waste rock with gentler slopes as shown on Map F-1. <br />9) Exhibit T: Regarding the statement, "......on this mesa with many mine workings perched several hundred <br />feet above the Paradox Valley and cut by numerous steep canyons the potential aquifers are dry," which <br />potential aquifers are referred to and what are the data to support that the aquifers are dry. <br />Sandstone formations within the Jurassic including the Wingate, Navajo, Entrada, and Morrison <br />Salt Wash Member are potential aquifers. These sandstones are exposed on the flanks of the <br />Mesa and are thus unconfined, and apparently dry. The uranium-vanadium host rock, the Salt <br />Wash Member of the Morrison Formation is separated from the Summerville Formation or <br />equivalent, which is an effective aquitard being composed of thin-bedded shales and mudstone. <br />The dips in Salt Wash sandstones and shales within the "fault blocks" on the Paradox Valley side <br />of the Monogram and Davis mesa are gently to the north-northeast. No springs are observed <br />coming out of these rocks; nor are flows of groundwater directed out of any of the adits or mines <br />in the area. Nuvemco has access to numerous open adits in the Salt Wash including to the east, <br />the Hummer and Jo Dandy mines; the A. No. 1 Extension, and the Opera Box is reportedly dry. <br />Open adits to the south and west include the Uranus West and the Bobtail South which Nuvemco <br />controls by NOI. Further west-northwest, Nuvemco operates the Last Chance Mine which is dry <br />on two different levels. Nuvemco will provide access to these mines for DRMS inspection at <br />any time to demonstrate the lack of water in the Morrison Salt Wash in this area. This empirical <br />19
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