2017-01-09_PERMIT FILE - C1981008

• Permit No: C1981008
• IBM Index Class Name: Permit File
• Doc Date: 1/9/2017
• Doc Name: Pond 018 As Built
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-35
• Media Type: D
• Archive: No

CONSULTING GEOTECHNICAL ENGINEERS AND MATERIAL TESTING
Western Fuels
PO Box 628
Nucla, Colorado
Attention: Mr. Frank Ferris, PE
November 8, 2016
PN: M16043GE
Subject: Calculated Theoretical Slope Stability for the
Pond 018 Section A -A'
New Horizon Mine
Nucla, Colorado
Mr. Ferris:
It is our understanding the theoretical slope stability of
Section A -A' of Pond 018 is requested. This letter presents of
the theoretical slope stability analysis.
Section A -A' from the provided Pond 018 As -Built plans was used
for the analysis. The soil strength parameters were determined
by performing a direct shear strength test on the soil materials
delivered to our laboratory, results attached.
The stability of any slope is dependent on many factors. Typi-
cally the stability of a slope is analyzed by calculating the
anticipated gravitational forces that tend to drive the mass of
soil downhill and the anticipated internal strength of the soil
along the expected plane of failure that will resist the downhill
movements. If the driving forces are equal to or greater than
the resisting forces then failure is imminent. A theoretical
calculated factor of safety of 1.5 is considered by the geotech-
nical engineering industry as a minimum factor of safety for a
slope to be considered as stable. A calculated factor of safety
of 1.0 or less indicates that slope movement is imminent or in
process. Failure can occur as slow deformation, creep, or as a
somewhat spontaneous failure.
P.O.Box 3986 P.O.Box 45
Grand Junction, Co. 81502 Montrose, Co. 81402
[phone] a970)24�164
Attachment 2.05.3(3)-35 Page 2 cto er (TR -76)