Attachment I-11
Leatherleaf Surface Mine - Results of ABA analysis on test borings
Five (5) drill holes had acid base analysis (ABA) performed on them for the Leatherleaf
Surface Mine permit area. These holes were RW-04-05, RW-04-07, RW-04-08, RW-04-09,
and RW-04-11. All of these holes with the exception of RW-04-05 were drilled from the
surface to the Little Eagle seam elevations. Hole RW-04-05 was drilled from the surface to the
Eagle “A” seam level. The proposed mining cuts will disturb the strata from the Little Eagle
seam up to the maximum highwall height, which has been labeled on the ABA data sheets, and
Selenium analysis sheets. In order to evaluate the mine site to determine if a toxic spoil
handling plan is needed, each overburden horizon between the coal seams was compared on a
weighted average basis using the spreadsheets on the following pages. To correctly calculate
the weighted effect each stratum will have on the characteristics of the spoil material, the
weighted averages must be calculated on a volumetric basis. Material exhibiting a Net
Deficiency of five (5) or greater is considered to be toxic and must be encapsulated. Material
that can be captured exhibiting a high Selenium value (greater than 1 mg/kg) must be
encapsulated due to the non-blendable nature of the element. The overall DER ratio and Net
Potential of the material that is not encapsulated can be seen on the summary sheet at the end of
this Attachment. Material that must be encapsulated will follow the Attachment O-8
Encapsulation Plan. See Attachment I-7 Geological Cross Sections and Attachment O-1
Regrade Cross Sections for limits of toxic material. If the thickness of this potentially toxic
strata is less than one (1) foot, and is not attached to a thicker strata exhibiting a high selenium
value or toxic potential, this material is not proposed to be separated as the diminutive volume
will have a minimal impact when blended with other burden and the small dimension makes it
difficult to identify and or segregate and capture in the field.
1) RW-04-05
a. In drillhole RW-04-05, three (3) non-coal samples exhibit a Net Potential of less
than -5.
i. Sample 13B, a 2.35 ft. thick Claystone layer with a Net Potential of -8.94
located directly below the Chilton Rider. This stratum will be encapsulated
per the plan in Attachment O-8.
ii. Sample 50, a 0.50 ft. thick Claystone layer with a Net Potential of -9.79
located directly above the Hernshaw coal seam. This stratum is not proposed
to be encapsulated as it is less than 1 ft in thickness.
iii. Sample 101, a 1.25 ft. thick Shale layer with a Net Potential of -48.99 located
directly above the Peerless coal seam. This stratum will be encapsulated per
the plan in Attachment O-8.
b. The overall Net Potential for drillhole RW-04-05 is 27.59.
2) RW-04-07
a. In drillhole RW-04-07, three (3) non-coal samples exhibit a Net Potential of less
than -5.
i. Sample 130, a 1.00 ft thick Shale layer with a Net Potential of -13.73 located
6.75 ft. below the Chilton coal seam. This Strata is not proposed to be
encapsulated, due to the small thickness and as it is does not show up in any
of the other analyzed holes,
ii. Sample 155B, a 1.60 ft. thick Shale with a Net Potential of -6.49 located
within the Upper Cedar Grove seam. This stratum will be encapsulated per
the plan in Attachment O-8.
iii. Sample 203, a 1.75 ft. thick Shale layer with a Net Potential of -5.71 located
directly above the Peerless coal seam. This stratum will be encapsulated per
the plan in Attachment O-8.
b. The overall Net Potential for drillhole RW-04-07 is 29.69.
3) RW-04-08
a. In drillhole RW-04-08, one (1) non-coal samples exhibit a Net Potential of less than
-5.
i. Sample 86, a 1.00 ft. thick Shale layer with a Net Potential of -98.60 located
directly above the Peerless coal seam. This stratum will be encapsulated per
the plan in Attachment O-8.
b. The overall Net Potential for drillhole RW-04-08 is 24.15.
4) RW-04-09
a. In drillhole RW-04-09, six (6) non-coal samples exhibit a Net Potential of less than
-5.
i. Unnumbered sample between samples 13B and 14B being a 1.55 ft. Shale
layer of interseam material in the Upper Winifrede coal seam with a Net
Potential of -6.60. This stratum will be encapsulated per the plan in
Attachment O-8.
ii. Sample 69, a 0.55 ft. thick Shale layer with a Net Potential of -23.25 located
directly above the lower split of the Chilton coal seam. This stratum is not
proposed to be encapsulated as it is less than 1 ft in thickness.
iii. Unnumbered sample between samples 92B and 93B being a 1.10 ft. Shale
layer of interseam material in the Upper Cedar Grove coal seam. This
stratum will be encapsulated per the plan in Attachment O-8.
iv. Sample 141, a 0.35 ft. thick layer of Sandstone with Coal Streaks with a Net
Potential of -414.68 located directly above the Peerless Coal Seam. This
stratum is not proposed to be encapsulated as it is less than 1 ft in thickness.
v. Unnumbered sample between samples 161 and 162B being a 1.05 ft. Shale
layer of binder between the Upper and Lower 2 Gas coal seams. This
stratum will be encapsulated per the plan in Attachment O-8.
vi. Sample 198B, a 2.00 ft. thick Shale layer with a Net Potential of -5.21
located 2.00 ft. below the Upper Eagle coal seam. This stratum will be
encapsulated per the plan in Attachment O-8.
b. The overall Net Potential for drillhole RW-04-09 is 17.61.
5) RW-04-11
a. In drillhole RW-04-11, four (4) non-coal samples exhibit a Net Potential of less
than -5.
i. Sample 11B, a 1.50 ft. thick Claystone layer with a Net Potential of -16.77
located directly below the upper split of the Peerless coal seam. This
stratum will be encapsulated per the plan in Attachment O-8.
ii. Sample 32, a 1.10 ft. thick Sandstone layer with a Net Potential of -10.47
located directly above the Upper #2 Gas coal seam. This stratum will be
encapsulated per the plan in Attachment O-8.
iii. Sample 67B, a 2.50 ft. thick Shale layer with a Net Potential of -6.13 located
1 ft. below the Upper Eagle coal seam. This stratum will be encapsulated
per the plan in Attachment O-8.
iv. Sample 70B, a 3.00 ft. thick Shale layer with a Net Potential of -5.69 located
8.50 ft. below the Upper Eagle coal seam. This stratum will be encapsulated
per the plan in Attachment O-8.
b. The overall Net Potential for drillhole RW-04-11 is 14.75.
See the attached spreadsheets for additional ABA information for each drillhole and a summary
of the entire project.
Leatherleaf Surface Mine - Results of Selenium analysis on test borings
Three (3) drill holes had selenium analysis performed on them for the Leatherleaf
Surface Mine permit area. These holes were RW-04-07, RW-04-09, and RW-04-11. The
results of the selenium analyses are shown on the following pages. The acceptable limits for
selenium are 1mg of selenium per kg of overburden.
1) RW-04-07
a. In drillhole RW-04-07 no non-coal samples exhibit a selenium value greater than 1
mg/kg.
2) RW-04-09
a. In drillhole RW-04-09 eight (8) non-coal samples exhibit a selenium value greater
than 1 mg/kg.
i. Unnumbered sample between samples 13B and 14B being a 1.55 ft. Shale
layer of interseam material in the Upper Winifrede coal seam with a
Selenium value of 1.16. This stratum will be encapsulated per the plan in
Attachment O-8.
ii. Unnumbered sample between samples 13B and 14B being a 0.60 ft. Shale
layer of interseam material in the Upper Winifrede coal seam with a
Selenium value of 1.98. This stratum will be encapsulated per the plan in
Attachment O-8.
iii. Sample 69, a 0.55 ft. thick Shale layer with a Selenium value of 1.28 located
directly above the lower split of the Chilton coal seam. This stratum is not
proposed to be encapsulated as it is less than 1 ft in thickness.
iv. Unnumbered sample between samples 92B and 93B being a 1.10 ft. Shale
layer of interseam material in the Upper Cedar Grove coal seam with a
Selenium value of 1.56. This stratum will be encapsulated per the plan in
Attachment O-8.
v. Sample 141, a 0.35 ft. thick layer of Sandstone with Coal Streaks with a
Selenium value of 2.14 located directly above the Peerless coal seam. This
stratum is not proposed to be encapsulated as it is less than 1 ft in thickness.
vi. Unnumbered sample between samples 161 and 162B being a 1.05 ft. Shale
layer of seam binder between the Upper & Lower #2 Gas coal seam with a
Selenium value of 1.70. This stratum will be encapsulated per the plan in
Attachment O-8.
vii. Sample 175, a 0.45 ft. thick layer of Bone with Coal layers with a Selenium
value of 5.50 located 10.15 ft. below the Powellton coal seam. This stratum
is not proposed to be encapsulated as it is less than 1 ft in thickness.
viii. Sample 197B, a 2.00 ft thick layer of Shale with a Selenium value of 1.52
located directly below the Upper Eagle coal seam. This stratum will be
encapsulated per the plan in Attachment O-8.
3) RW-04-11
a. In drillhole RW-04-11 two (2) non-coal samples exhibit a selenium value greater
than 1 mg/kg.
i. Sample 58B, a 2.50 ft. thick Shale layer with a Selenium value of 1.58 being
interseam material in the Upper Eagle Rider coal seam. This stratum will be
encapsulated per the plan in Attachment O-8.
ii. Sample 66, a 1.00 ft thick Claystone layer with a Selenium value of 4.00
located directly below the Upper Eagle coal seam. This stratum will be
encapsulated per the plan in Attachment O-8.
See the attached spreadsheets for Selenium analysis for each drillhole.