PERMFILE46723

• Permit No: M1988112
• IBM Index Class Name: Permit File
• Doc Date: 11/8/1988
• Section_Exhibit Name: APPENDIX Q ADEQUACY REVIEW QUESTIONS AND RESPONSES
• Media Type: D
• Archive: No

1 Exhibit E, Section E.3.1.2 revised to include a discussion of the rock toe
buttress and the impermeable barrier 2/15/89 and further revised 4/20/89.
Section D.3 Waste Rock Disposal
Section D.3.1 Genera)
' 6. Does cross section A-A', illustrated in Figure D.3-4, refer to a
specific figure, or is this an idealized cross section?
Response: Cross section A-A' refers to figure D.3-2. A cross section
location has been added to Figure D.3-2.
Figure D.3-2 revised 2/15/89.
Section D.3.3.2 Waste Rock Geochemistry
7. Pease specify the Location and depth of each waste rock sample taken.
This information will help us to make a determination as to the sample
significance.
Response: The drilling logs for each sample are enclosed along with a
notation on each log for the approximate interval from which a
composite sample was taken. The drill logs include a coordinate
location for each hole.
BMR geologists selected the core based on criteria established
t by SRK's geochemical expert. The criteria included selecting a
sample that was considered representative of the general rock
type being tested, selecting a sample that might represent a
worst case for the rock type being tested, and ensuring that a
sufficient amount of material was available in the core selected
to complete the testing. BMR geologists first reviewed the drill
logs for drill holes which had been cored. They then selected
potential drill holes with logs which matched the criteria. The
core from the selected holes was examined to verify the logs.
Once BMR geologists had determined that the core matched the
' criteria, the core was shipped to SRK`s laboratory for
development of a composite sample.
' Exhibit D, Section D.3.3.2 revised to include this information 4/20/89.
8. To characterize the estimated 32 million tons of waste rock expected
to be generated from the open pit areas, eight waste rock samples
analyses were submitted for review. Please describe how this sample set
adequately characterizes site conditions, given the amount and variety
of waste rock to be generated on site.
' Response: BMR believes that the sample set adequately characterizes site
conditions.
' Based on the revised pit design presented on Figures C-3 and C-
4 approximately 22.5 million tons of waste rock is expected to
be generated at the San Luis Project.