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The Leadville Mill 4.0 EXHIBIT C - MILL PLAN (SEC 6.3.3) 4.1 BACKGROUND M 1990 -057 EXHIBIT C — MILL PLAN Page 4 -1 The Mill (permitted under Calais Colorado Resources, Inc. Permit M1990 -057) is scheduled to commence operations with mill closure to occur in 2040. The planned facility, with the reconstructed TSF (Section 4.3, Tailings Storage Facility), has sufficient capacity to operate approximately 1 year at 160t /d. Leadville Mining and Milling, Inc. constructed the mill in 1989 to process ore from the Hopemore Mine located 8mi east of the Mill. The mine and mill commenced production in 1989 and operated sporadically for less than two years. A building permit was obtained in December 1987 and certificates of occupancy (Sec. 7.0, Exhibit F) were issued for the crusher building on October 5, 1990 and the mill building on November 9, 1990. The Mill was originally selected -to: • Locate the tailings storage facility; • Mitigate the generation of airborne migration of dust from the tailings disposal area; • Isolate from neighbors and heavy traffic; • Locate in close proximity to electric power, water, and natural gas; and, • Minimize haulage distance within the mining district. The mill site is located in a heavily- wooded area on the lee side of an east -west trending hill which affords maximum protection from the normal prevailing wind from the northwest. The mill maintains a minimum cleared area to afford a good firebreak distance around the buildings, roads and tailings storage area. The nearest inhabited buildings to the mill permit boundary is a structure (Mellott) located about 550ft northwest, a house (Mellott) located approximately 800ft west and a house (Wibbenmeyer) located approximately 550ft west. Sec. 13, Exhibit L describes and illustrates the location of "Permanent Man -Made Structures" within 200ft of the permit boundary. Version 1.0 April2013