A City Hall panel in March granted tighter protections to a series of relics from Park City’s silver mining era, acknowledging that a landowner should be required to proceed through a highly regulated process before they could be razed.

The Historic Preservation Board made a determination that the relics are significant, a City Hall term used to designate old buildings that leaders want to ensure remain standing. Board members cast unanimous votes on each of the five mining-era relics.

The sites are:

The Daly West site in Empire Pass close to the location where the Montage is under construction. The headframe of the Daly West mine, with hoisting works still inside a building next door, remain at the site. The Daly West was an important fixture during the mining era.

The Alliance Mine site in Walker Webster Gulch south of Daly Avenue

The Judge Mine site in Empire Canyon south of Daly Avenue

The Judge Mine aerial tramway towers, which stretch on a ridge from Daly Avenue to Prospect Avenue

The Little Bell mine site in the upper reaches of Empire Canyon, just off Deer Valley Resort’s Bandana ski run

The panel is preparing to make the same determination on the Spiro Tunnel, which is located on the grounds of the Silver Star development on the edge of the Thaynes Canyon neighborhood. The Spiro Tunnel vote could be cast on Wednesday.

A building or structure that has been determined to be significant cannot be torn down unless City Hall authorizes the razing by awarding the owner a certificate acknowledging that the building or structure is appropriate for demolition. The Planning Department and the Building Department make those decisions, which sometimes are controversial.

The Historic Preservation Board in 2009 granted the same level of protection to another set of mining-era structures, including well-known sites like the Silver King building on the slopes of Park City Mountain Resort and the series of mine towers along the route of the Town Lift.

Leaders at City Hall and in Park City’s influential preservation community have long worked to celebrate the mining era. The industry dominated Park City from the city’s early years in the 19th century until the middle of the 20th century.