APPCOR11208

• Permit No: C1996084
• IBM Index Class Name: Application Correspondence
• Doc Name: LORENCITO CANYON MINE PR EXHIBIT 2
• Media Type: D
• Archive: No

[f excess soil exists in other Locations of the mine, along roads proposed to remain as
• permanent, or location where available soil is in excess, RR loadout, these excess soils may
be proposed to be utilized at the surface mine azea.
es ns
LCC has proposed to use overburden material as a plant growth medium and has made a
commitment in the existing text to sample replaced material at two different depth intervals
for "the physical and chemical parameters listed in Section 4.06.2(4)". Information from two
holes, BH-1 and BH-2 is available in Exhibit 6, and documents the geochemical
characteristics of the overburden in the vicinity of the Jeff Canyon surface mine. These data
document pH, the acid-neutralization potential, texture class, electrical conductivity and
sodium absorption ratio, as well as at least twenty other parameters including organic matter
and nitrate-nitrite as N. LCC has identified core intervals of limited thickness which
independently, unmixed, have the potential to limit vegetation success due to elevated
concentrations of selenium, SAR, molybdenum, and acid-base potential.
The sampling commitment provides back-end verification of existing baseline data. The
proposed sampling plan ensures that LCC will provide an adequate plant growth medium,
despite operation conditions which might generate a higher percentage of coarse fragments
or placement of materials which fall in the extreme ends of the ranges of values which might
be seen.
• Current plans do not include transportation of soil materials for more than a half mile.
Rule 2.05.3(61 OQeration Plan -Overburden
91. Please provide the following for each of Fills 1-9:
a) the fill voltune (Sections 4.09.2(d) and 4.09.3(1))
b) the elevations of the fill toe bottom, the top of the back of fill, and the slope of the
valley profile through that section of the valley (Table 1 of Figure 1 of Exhibit 13
may no longer be correct if the Fill elevations shown on Map 2.05.4-1 are the actual
planned final elevations)
c) the results of the individual geotechnical studies done to demonstrate compliance
with Section 2.05.3(6)(b), (c), and (d). (The materials provided in Exhibit 13 state
that the findings provided in that report are preliminary, and that further testing
should be done to confirm preliminary conclusions.)
d) the material planned for use as the filter fabric for the rock drains (Section
4.09.2(2)(c)).
e) Identify those fills which fall into CTL Thompson's category of "non-valley fills"
(Figure 5, Exhibit l3), for the purposes of drain construction.
CJ
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