Laserfiche WebLink
1.1.2 Regulatory Framework <br />This electron microprobe analysis is a 1 <br />permitting requirements related to poti <br />preparation of an environmental protel <br />relates to identifying any "acid- or toxi <br />program is addressed in Evaluation of Y_ <br />Mines (CDM 2009a) and Evaluation of E <br />(CDM 2009b). This report describes onl <br />Irt of a larger program to address state mine <br />ltial designated mining operation status and <br />ion plan for the mine. One facet of this process <br />forming materials" at the mine sites. The overall <br />vironmental Geochemistry of the Sunday Group <br />vironmental Geochemistry of the Van 4 Mines <br />facet of the overall geochemical characterization <br />program. <br />Evaluation of the potential for ore or d <br />sampling of the ore stockpiles and de-, <br />total metals, and screening of the total <br />screening criteria. This process is desi€ <br />development: rock based on exposure <br />The initial screening showed total con <br />criteria with the exception of arsenic. I <br />initiated to further understand the pot <br />Van 4 mines. This program is designe( <br />arsenic in the specific mineralogical fo <br />Mines. This second phase includes in= <br />electron microbe analyses to determin <br />present at the mines. <br />rock to be toxic-forming included <br />lopment rock areas, analysis of these samples for <br />petals data in relation to appropriate toxicity <br />ied to evaluate potential toxicity of the ore and <br />athways of incidental ingestion and inhalation. <br />mtrations of all metals to be below the screening <br />ierefore a second phase of investigation was <br />ntial. toxicity of arsenic at the Sunday Group and <br />to allow consideration of the bioavailability of <br />ns present at the Sunday Group and Van 4 <br />.tro analysis of arsenic bioavailability and <br />the specific mineralogical forms of arsenic <br />1.1.3 Deposit Type and Mineralogy <br />The Sunday Group and Van 4 uranium-vanadium deposits are roughly tabular deposits <br />that occur within the Salt Wash Member of the Morrison Formation. The deposits are all <br />located in a distinct calcareous sandsto <br />located in the upper portion of the Salt <br />mineralization occurs in preferential b( <br />as dark colored disseminations in the s <br />have been mined and exposed to surfai <br />oxidize and alter to other minerals that <br />coatings on strongly mineralized rock. <br />to unit called the Top Rim sandstone, which is <br />Wash Member. Uranium-vanadium <br />ds within the Top Rim sandstone, and is visible <br />indstone units. Once ore or development rock <br />e oxidation, the uranium-vanadium minerals <br />are recognized as yellow to greenish yellow <br />Uranium in the Colorado Plateau occu <br />U(VI). The primary minerals in the de- <br />oxidized U(IV) form. Primary minera. <br />identified in Colorado Plateau uraniui <br />Uraninite (U02) is an oxide mineral. C <br />Uranium in uraninite and coffinite oxi <br />environments and other factors to forr <br />Christ 1956). <br />T:\64986-Denison Mines\Task Order 3 - DMO Sampling and Analysis <br />; in two dominant oxidation states, U(IV) and <br />)sits are thought to contain uranium in the less <br />containing uranium as U(IV) that have been <br />deposits include uraninite and coffinite. <br />finite (U(SiO4)o.9(OH)o.4) is a hydroxyl silicate. <br />izes as a result of exposure to oxygenated <br />a wide variety of U(VI) minerals (Garrels and <br />2 <br />3.12 - Soil, Ore, Rock Data Assessment Repon\Bioavailability\DenisonEMPText02 [ 7O9 (2).doc <br />• <br />• <br />•