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
as ranging from fine grained to i
observations collected during th
relationship developed by Chilii:
provided by Jobim (1962), the pc:
estimated to range from approxi:
linear groundwater velocity, the
estimated porosity of the Salt W
edium grained, which is supported by visual
course of this investigation. Based on the empirical
;er (1963) and the intrinsic permeability data
osity of the Salt Wash member sandstones is
lately 11 to 14 percent. In this estimation of average
ffective porosity is assumed to be equivalent to the
;h member sandstones.
The average linear groundwater, velocity is estimated based on a hydraulic
conductivity of 1.1 x 10-4 cm/sec,I a hydraulic gradient of 0.13, and the range of
effective porosities discussed above. These estimates are shown in Exhibit 2-3.
Exhibit 2-3. Estimation of linear groundwater velocity in Van 4 mine area for Salt Wash aquifer.
Hydraulic Conductivity Estimated Hy draulic Assumed Effective Estimated Linear
(cm/sec) Gradient Porosity Groundwater velocity
(feet/year)
1.1 x 10-4 cm/sec 0.0125 0.11 12.9
1.1 x 10-4 cm/sec 0.0125 0.14 10.1
Based on the estimated presented in Exhibit 2-3, the average linear groundwater
velocity is thought to range from approximately 10.1 ft/yr to 12.9 ft/year.
2.3.4 Naturally Occurring Geochemical Conditions
The most important naturally occurring geochemical conditions in the vicinity of the
Van 4 Mine are natural enrichments of uranium-vanadium mineralization. The Van 4
Mine is located within the larger Uravan Mineral District, and natural enrichments of
uranium, vanadium and other m
deposit occurs in the sub-surface
present in numerous locations w
numerous mining areas north of
uranium reserve, as well as outer
watershed. Other elements that
vanadium enrichment include ai
(Rose et al, 1979).
tals are present in the area. Although the Van 4
outcropping uranium-vanadium mineralization is
hin the area (e.g. Cater 1954). This includes
he Van 4 Mine within the Department of Energy
ipping mineralized areas in the Bull Canyon
e associated with naturally occurring uranium-
enic, molybdenum, selenium, lead, and copper
2.3.5 Groundwater Quality
Groundwater quality data for by rogeological units within the Alluvial, Dakota, Salt
Wash and Navajo aquifers is suu marized in Table 2-6 based on regional data
provided by Weir et al. (1983). V1 ter quality characteristics vary between the
hydrogeological units. General ; oundwater quality characteristics include the
following:
¦ Groundwater from alluvial
dissolved solids (TDS), chl

.rs has moderate to high concentrations of total
and sulfate with neutral pH;
2-12
0
C:

draft final van 4 hycimpology repon.doc