2024-12-16_REVISION - M1977410 (2)

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Cross Gold Mine December 2024 L-1 Exhibit L Reclamation Costs Reclamation costs were estimated in the 2021 amendment using the Nevada Standardized Reclamation Cost Estimator Version 1.4.1 (SRCE), Build 017b (available at: https://nvbond.org/. (NDEP-BMRR 2019). This cost estimator is a robust and accepted by federal and state agencies in the western U.S. A summary is provided in Table 7 below and the full set of spreadsheets (with quantities) is available in Appendix L-1. The surface areas of buildings and other rectangular structures are calculated using the nominal dimensions of the buildings. The surface areas of non-rectangular features are determined in AutoCAD using the surface area command. The polylines that bind these features are constructed using survey data. Triangulation surface files were generated of the existing ground and all features that contain fill material. The fill material surfaces include the berms built to construct Ponds 1, 2, 3A, 3B, and 3C; the fill for the new road; and the waste rock and ore piles. The volume between the existing ground and the final surface was then calculated in AutoCAD, with an inclusion perimeter polyline utilized to demarcate the boundary of the feature. 1. 2021 Site Specific Assumptions • Topsoil is trucked in from Nederland (4.3 miles = 22,704 ft distance at 6.6% grade). • Pond sediment is trucked to landfill in Erie (44.3 miles = 233,872 ft at -2.2% grade). • The foundation is assumed to be 6" for buildings and 0" for CONEX containers. • The planting mix in Table 4 and 5 (Riparian or custom) as the planting mix because it is the most expensive mix in the spreadsheet at $393/acre. • Mulch and fertilizer are included in the revegetation cost estimate. • There is a 60% erosion maintenance to the budget, which was approximated by determining revegetated areas where the natural ground exceeds 3:1. • There is a 50% revegetation maintenance allowance. • The spreadsheet is designed for regrading, not complete removal of waste rock piles. Waste rock volumes with haul distances (similar to the ponds) are used. • Acres for reclamation are shown in Exhibit D, Table 1. Table L- 1. 2021 Reclamation Cost Summary Task Labor ($) Equipment ($) Materials ($) Total ($) Earthwork/Recontouring 34465 76729 13267 124,011 Revegetation/Stabilization 2760 987 9178 12,925 Detoxification/Water Treatment/Disposal of Wastes 905 1695 0 2,600 Structure, Equipment and Facility Removal, and Misc. 10099 4548 7980 22,627 Monitoring 7104 20084 1306 28,494