2009-06-08_REVISION - M1997032 ‎(25)‎

• Permit No: M1997032
• IBM Index Class Name: REVISION
• Doc Date: 6/8/2009
• Doc Name: EPP ‎(AM-01)‎ Attachment E,F,G,H,I, and J ‎(part 7)‎
• From: Denison Mines
• To: DRMS
• Type & Sequence: AM1
• Email Name: RCO
• Media Type: D
• Archive: No

Hydrogeological Evaluation of Van 4 Mine
Geologic and Hydrogeologic Conditions
¦ Permian Cutler Formation;
¦ Upper Triassic Chinle Forma
¦ Jurassic Glen Canyon Group;
¦ Mid to Upper Jurassic San Ra
¦ Upper Jurassic Morrison Fori
¦ Lower Cretaceous Burro Can
¦ Cretaceous Dakota
¦ Cretaceous Mancos Shale;
¦ Unconsolidated Quaternary
The Permian Cutler Formation
Formation and other older mi
described in detail in this sun
arkosic sandstone and conglo
within the formation. The for
ft.
Group;
Formation;
ts.
lies the Paradox Member of the Hermosa
orphic and sedimentary rocks, which are not
y. The Cutler Formation consists predominantly of
te. Small quantities of sandy shale are present
)n has an estimated thickness that approaches 3,000
The Cutter Formation is overlain by the Upper Triassic Chinle Formation. This unit
consists primarily of siltstone intierbedded with fine grained sandstone, shale and
conglomerate. The individual lithological units within the formation are lenticular
and discontinuous. This unit is c?mmonly 500 to 600 ft. thick.
The Chinle Formation is overlair
three formations: the Wingate &
Sandstone. The Wingate Sandstor,
consists of massive, fine grained
sand grains. The unit contains vE
formation, which contributes to
by the Jurassic Glen Canyon Group, which includes
idstone, the Kayenta Formation, and the Navajo
overlies the Chinle Formation. This formation
andstone composed of clean well-sorted quartz
•tical joints that extend the entire thickness of the
tiff formation.
The Kayenta Formation overlies tl}e Wingate Sandstone and consists of interbedded
sandstone, siltstone and shale. The sandstone is thin bedded, flaggy to massive, and
occurs in discontinuous beds that interfinger with siltstone and shale. The thickness of
the Kayenta Formation ranges fr?m 180 ft. to 210 ft.
The Navajo Sandstone is massive fine-grained clean quartz sandstone, which overlies
the Kayenta Formation. This unit is eolian in origin as evidenced by very large scale
cross-bedding. The formation is approximately 400 ft. thick in the project area.
The Glenn Canyon Group is
which includes three format

lain by the mid- to upper Jurassic San Rafael Group,
The Carmel Formation, the Entrada Sandstone, and
2-2

n
U
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draft final van 4 hydrogeology raport.doc