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Cripple Creek&Victor Gold Mine <br /> Valley Leach Facility Expansions ■ <br /> Detailed Design for Permitting <br /> NewFields Project No.475.0106.064 <br /> 1111 March 2024 <br /> 3.3. Valley Leach Facility Expansion Geophysical Survey(IGES, 2023) <br /> Intermountain GeoEnvironmental Services (IGES) completed a seismic velocity survey within the <br /> VLF1 and VLF2 Expansion footprints. The survey included ten seismic velocity P-wave (Vp) <br /> refraction profiles and three seismic velocity shear wave surveys (Vsioo),to determine the seismic <br /> velocity profile of the shallow subsurface to a depth of 0 to 40 feet and to delineate depth to <br /> bedrock. The (Vsioo) was completed to determine the shear wave velocity profile of the near <br /> surface to determine the seismic site class. Ten survey lines between 150 feet and 870 feet were <br /> evaluated in the facility's footprint and along the general alignments of the internal <br /> embankments. <br /> The results of the geophysics indicate the site wide Vs1oo (average shear wave velocity in the <br /> upper 100 feet of the subsurface) ranges from approximately 1,700 to 2,800 feet per second <br /> (fps). Approximate depth to bedrock is delineated in the profiles by displaying two general <br /> velocity zones. Low density materials exhibiting velocities (Vp) of less than 4,000 feet per second, <br /> and higher density materials exhibiting velocities (Vp) of greater than 4,000 feet per second. <br /> Based on these findings approximated depth to bedrock ranges from 0 to 60 feet depth along all <br /> profiles. Section B displays the shallowest area of bedrock ranging from 0 to 10 feet depth along <br /> the profile and Section I displays the deepest bedrock ranging in depth from 50 to 60 feet. The <br /> IGES report is provided in Appendix A. <br /> 3.4. Laboratory Testing Program <br /> Laboratory testing in support of the VLF Expansions included index testing of foundation soils. <br /> Samples from the test pit program were labelled and tested at NewFields on-site materials <br /> testing laboratory. The purpose of the testing program was to characterize the materials <br /> encountered during the field investigation, confirm the field interpretation of the materials, and <br /> to develop engineering parameters to aid in the VLF Expansions' design. <br /> Materials testing on representative samples obtained during the field investigation included the <br /> following laboratory tests: <br /> Natural Moisture (ASTM D2216) <br /> Sieve Analysis with No. 200 Sieve Wash (ASTM D6913) <br /> Atterberg Limits (ASTM D4318) <br /> Individual laboratory sheets are included in Appendix B, and a summary of the laboratory testing <br /> is included in Table B.1 in Appendix B. <br /> • <br /> Page 6 <br />