2012-08-13_REVISION - M1982090 ‎(2)‎

• Permit No: M1982090
• IBM Index Class Name: REVISION
• Doc Date: 8/13/2012
• Doc Name: TR-04 SUBMITTAL
• From: REARDON STEEL
• To: DRMS
• Email Name: RCO
• Media Type: D
• Archive: No

Beyond the collapsed portal, the condition of the 14L drift is unknown. It was most recently used in the
early 1990s, which indicates that it is probably in relatively good condition. However, until the portal is
re- established, CBCI is assuming that some degree of rehabilitation will be required to safely access the
entirety of the 14L drift. Rehabilitation will likely consist of setting track, drilling, bolting, spiling,
mucking collapsed rock, setting timbers and steel sets, installing electrical and air utilities, constructing a
refuge chamber, and installing a ventilation system. The equipment that will be used in support of the
rehabilitation effort is included in Attachment F.
Only a small amount of rock is expected to be brought to the surface as a result of rehabilitating the 14L
drift. Rock brought to the surface will disposed of in a cut -slope that is north and adjacent to GA2, as
shown in Photos 6 and 7 and Figure 2. According to personnel previously employed by CBCI, the cut -
slope was created during reclamation activities in 2006. Waste rock was taken from the slope and used as
capping material over GA #1 and GA #2. The cut -slope should accommodate approximately 1,000 to
1,500 cubic yards of material in order match the surrounding slope of —1:2 (V:H). Although the actual
figures are unknown because the underground conditions are unknown, CBCI only anticipates disposing
of a maximum of 500 cubic yards in the cut - slope. In the event that the cut -slope is filled and rock
disposal is still required, CBCI will submit a separate TR that defines a different disposal area.
The steep cliffs surrounding the 112 permit boundary are comprised of Tertiary San Juan Tuff (Tsj) and
represent the rock that the 14L drift passes through prior to the Camp Bird vein (-14,000 feet from the
portal). Material derived from collapsed areas prior to the Camp Bird vein is expected to be barren, un-
mineralized, and un- altered Tsj. However, to ensure that the Tsj rock disposed of in the cut -slope is not
acid generating, CBCI will conduct periodic sampling of the disposed solids. A representative sample
will be collected from every collapsed zone encountered, or every 5,000 tons, whichever is more frequent.
The samples will be sent to a qualified analytical laboratory (e.g. ACZ labs) for acid:base accounting
(ABA). The procedures for ABA include the following:
Preparation (method in parentheses)
Air dry at 34° C (USDA No. 1, 1972)
Crush and Pulverize (ring & puck) (EPA- 600/2 -78 -054 3.1.3)
Saturated Paste Extraction (USDA No. 60 - 2)
Analytes (method in parentheses)
Acid Generation Potential (calculate based on Sulfur total) (M600/2 -78 -054 1.3)
Acid Neutralization Potential (calculate) (M600/2 -78 -054 1.3)
Acid -Base Potential (calculate based on Sulfur total) (M600/2 -78 -054 1.3)
Neutralization Potential as CaCO3 (M600/2 -78 -054 3.2.3)
pH, Saturated Paste (USDA No. 60 - 21A)
Solids, (Percent) (CLPSOW390, Part F, D -98)
Sulfur Forms (M600/2 -78 -054 3.2.4 -MOD)
The suite of ABA parameters listed above will provide several measures of acid generating and
neutralizing characteristics in addition to "forms of sulfur ". The forms of sulfur present (residual vs
organic vs sulfate derived) dictate whether an acid can form. All raw and summarized results will be
provided to DRMS.
Technical Revision, Camp Bird Mine 112 Permit (Permit No. M -1982 -090) Page 9