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VLF2 Phase 3 Stage B Rockfill Method Specification NewFields Job No. 475.0106.069 June 14, 2024 <br /> <br />Page 1 <br /> MEMORANDUM <br />To: Antonio Matarrese, CC&V <br /> Daniel Egley, CC&V <br /> Evan Fonger, CC&V <br />From: Tyler Wendlandt, NewFields <br />Project: VLF2 Phase 3 Stage B Construction <br />Project No: 475.0106.069 <br />Subject: Structural Fill Compaction Method Specifications <br />Date: June 14, 2024 <br /> <br />On June 13th, Holcim Group (Holcim) began construction of a test pad to develop a method <br />specification for structural fill with more than 30% rock material above the ¾-inch sieve size. <br />Holcim first prepared an area with a firm and unyielding surface along the south fill area <br />approximately N 57,690 E 38,200, at the 10,260 ft. elevation. The structural fill material was cut <br />from the existing Dump 1 Overburden north of the fill and spread into a two-foot lift with a D6 <br />dozer. A grid was marked across the test pad and surveyed by Holcim Survey. These same points <br />were surveyed after each pass of the CS-56 vibratory sheepsfoot roller until an elevation change <br />of less than one half of 1 tenth inch (0.05”) lower than the last surveyed point was achieved on <br />average. It was found that this was achieved after two passes (one pass = forward and backward) <br />of the vibratory sheepsfoot roller. <br />A John Deere 470 excavator dug a test pit in the center of the test pad, verifying compaction <br />through the 2-foot-thick lift. A 966 loader then loaded the excavated material and transported it <br />to the contractor lay-down area for Particle Size Distribution testing. <br />Photographs of the method specification development are attached to this memo. The CQA <br />Monitor accepted the method specifications and all fills constructed with SF were performed in <br />accordance with them and project technical specifications. <br />If you have any questions or require additional information, please contact the undersigned. <br />Sincerely, <br /> <br />NewFields Mining Design & Technical Services <br />Tyler Wendlandt <br />Project Resident <br />9540 Maroon Circle <br />Suite 300 <br />Englewood, CO 80112 <br /> <br />T: 720.508.3300 <br />F: 720.508.3339