2010-05-07_PERMIT FILE - C2006085 ‎(2)‎

• Permit No: C2006085
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: No

This material will be transported from each shaft base to the surface
through the slope.
Based on the proposed size and length of the slope and shafts, an
estimated 20,500 cubic yards of excavation material will be produced.
This volume is based on the excavated in -place volume of the rock
including material swell and compacted placement factors shown in
Exhibit AC. Northfield plans to place and compact this material while
constructing the remainder of the mine bench for the mine facility
area.
Given that the slope and shafts will be driven from the surface to the
coal seam through overburden, Northfield requests that the excavation
materials from the slope and shafts may be utilized as bench fill
material and classified as overburden. Based on information obtained
from two local coal mines that operated recently in the Vermejo
formation, the rock strata above the Ocean Wave seam is unlikely to
contain any significant quantities of acid - forming or toxic materials. In
the area of the slope and shafts, the overburden is made -up of
approximately 75 percent sandstone and interbedded sandstone that
typically contain low levels of toxic or acid - forming materials.
Northfield obtained overburden core samples, at the NF -02 site, in the
vicinity of the slope and shafts and conducted testing in accordance
with the parameters described in the Division's Guidelines for the
Collection of Baseline Water Quality and Overburden Geochemistry
Data, issued Sept. 16, 1982.
Data indicated that the materials are predominately non -acid forming.
In addition, exchangeable sodium percentage (ESP) and pH values are
within acceptable ranges. Concentrations of potential toxic - forming
elements, with the exception of a single high selenium value for
sandstone, indicate that the excavation materials placed in the mine
bench will not adversely impact the hydrologic balance or revegetation.
A total of five (5) Northfield strata -com posited samples were analyzed
comprising the five prevailing strata groups. Laboratory data for the
samples is provided in Exhibit Al.
Following is a list of sample I.D. numbers and sample composite
lithology for the overburden core samples:
2.05.3 -29 Revised 12/04/09, TR -01