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Pencils with pickaxe erasers and EpicPromise stickers litter the top of a wooden barrel at O.P. Rockwell during the EpicPromise Grant Party Wednesday evening, Nov. 30, 2016. Guests were invited to take one of each as a souvenir. (Tanzi Propst/Park Record)

Park City Mountain Resorts Chief Operations Officer Bill Rock addresses a large crowd at O.P. Rockwell during the EpicPromise Grant Party Wednesday evening, Nov. 30, 2016. Rock kicked off the event by speaking about the collective commitment to preserving Park City Mountain's mining legacy. (Tanzi Propst/Park Record)

Vail Resorts's Kristin Williams addresses a large crowd at O.P. Rockwell during the EpicPromise Grant Party Wednesday evening, Nov. 30, 2016. Williams followed Park City Mountain Resorts Chief Operations Officer Bill Rock's speech. (Tanzi Propst/Park Record)

(Tanzi Propst/Park Record)

From left, Mayor Jack Thomas, Sally Elliott, Park City Mountain Resorts Chief Operations Officer Bill Rock and fourth generation Park City miner Clark Martinez pose for a photo at O.P. Rockwell during the EpicPromise Grant Party Wednesday evening, Nov. 30, 2016. (Tanzi Propst/Park Record)

Guests fill the dance floor at O.P. Rockwell during the EpicPromise Grant Party Wednesday evening, Nov. 30, 2016. Each attendee was given a drink ticket and was offered a variety of appetizers to snack on throughout the evening. (Tanzi Propst/Park Record)