INSPEC26806

• Permit No: M1980244
• IBM Index Class Name: Inspection
• Doc Name: DMG MINERALS PROGRAM INSPECTION REPORT
• Inspection Date: 8/29/1994
• Media Type: D
• Archive: No

C , ` • •
(Page 2)
MINE ID f OR PROSPECTING ID / M-80-244
INSPECTION DATE 8-29-94 INSPECTOR'S INITIALS ACS
OBSERVATIONS
A monitoring inspection of the Cresson Project Phaee 1 leach facility was conducted. The
Ironclad tailings stockpile and processing facility was also inspected.
A disagreement has arisen between the operator and the Division regarding eubgrade
preparation for geosynthetic installation. It ie the operator's view that rocks passing a
2 inch screen may be exposed in the surface of the liner eubgrade ae long as the surface has
been rolled and otherwise adequately prepared. It is the Division's view that no rocks
larger than 3/4 inch should be at the exposed surface of the prepared eubgrade.
An area on the south side of the Phase 1 pad where soil liner had been placed and compacted
was inspected with the goal of resolving the disagreement. The night before the inspection,
rain had washed-out the prepared surface of the soil liner, and the contractor was in the
process of re-compacting the washed-out area. Numerous gravel size, and some cobble size
rocks were observed in the placed soil liner fill. Rocks exposed in the prepared surface
that would not be acceptable to the Division given the current level of information were
pointed out to the operator. Based on the small area of prepared surface that was available
for inspection, it ie estimated that such rocks would number in the range of 50 to 100 per
acre of liner. It was agreed that Golder would conduct pressure testa on the liner materials
to determine if rocks larger than 3/4 inch (up to 2 inch) would compromise the integrity of
the geosynthetic liner. It was further agreed, that until the testing ie complete and ie
accepted by the Diveion (assuming that the results are favorable) the operator will assure
that all large erratic rocks exposed in the prepared soil liner surface will be removed, and
the voids in the surface left by rock removal repaired, prior to deployment of geosynthetic
over.the soil liner eubgrade.
Final grades for the Phaee 1 pad on the south aide of the gulch were shot with an Abney
level. Measurements in one of the steepest areas were 14 and 15 degrees, well below the
maximum permitted slope of 2.5:1, or 21.8 degrees. Water was impounded against the partially
constructed Phase 1 toe berm indicating that the riser pipe connected to the underdrain in
this location was not functioning. The operator stated that this water would be pumped down,
and any problem with the riser pipe corrected. The operator was instructed to sample this
water to determine if run-off from the soil liner (Ironclad tails) being placed on the south
aide of the gulch ie free of cyanide.
The soil liner fill ie being screened to a 3 inch-minus particle size at the Ironclad/Globe
Hill facility. When the Division approved a specification change to allow up to 10 percent
material gradation from 3/4 to 2 inch within the soil liner fill, it was with the
understanding that rocks larger than 2 inches would be hand-picked from the fill. No hand-
picking of these oversize materials was observed at either the loading point, or at the
dumping and placement point, during this inspection. The only way to provide reasonable
assurance that oversize is excluded from the soil liner is to have laborers continuously
observing dumping and placement of soil liner fill, and hand-picking the oversize rocks. The
Division observed a number of oversize rocks within the soil liner fill that had been placed.
If oversize ie not being removed continuously during soil liner placement, the Division will
require the operator to cease soil liner operations until the problem is corrected, and a
violation may result (see PB 1).
At the Ironclad tailing screening facility, it was observed that reject off the 3 inch screen
was being dumped into the Ironclad mine pit. This oversize material includes non-detoxified
Ironclad spent ore. Lead specialist for the CC&VG permits, Berhan Keffelew, was notified of
this practice by phone, and indicated that dumping the oversize into the mine pit would have
to be incorporated into the permit, and further stated that he would work out the details
with the operator.
cc: Berhan Keffelew, DMG
Jim Pendleton, DMG
Jim Dillie, DMG
I & E Contact Address Carl Mount, DHG
^ CE
NAME ~ John Hardaway ^ BL
OPERATOR Crioo le Creek 6 Victor Gold Co. ^ FS
STREET P.O. Box 191 ^ HW
CITY/STATE/ZIP Victor, CO 80860 ^ HMWMD (CH)