By Jillian Perry
The Wasatch Front is rich with raw materials including sand, gravel, and limestone, deposited during the Lake Bonneville days thousands of years ago. The abundant supply of material, along with the growing demand for development, has made the Wasatch an attractive location for aggregate mining companies.
The scenic byway connecting the Wasatch Front and Back, Parley’s Canyon, has been an especially sought-after, yet incredibly controversial, destination for mining companies looking to extract aggregate materials for construction projects. Currently, the unique rock formations and colorful vegetation in Parley’s Canyon are interrupted partway through by the Harper/Kilgore Quarry gravel mine.
Open-pit mining is a complex issue that weighs environmental conservation, public health, and recreational opportunity, with a rapidly expanding downwind community and growing demand for aggregate materials. For this reason, it has been a hot topic in our area, specifically in terms of the debated Granite Construction mine expansions in Parley’s Canyon.
The Salt Lake Valley is in a geologically compromised location that already struggles with environmental and air quality issues. Upwind mining operations exacerbate these issues and pose risks to those living in the largest metropolitan area in the state.
The aggregate mining process pulverizes rock and can release toxic airborne particulates called crystalline silica, a known carcinogen associated with lung disease that can easily get pushed down the canyon and into the Salt Lake Valley by steady winds blowing through the canyon.
On top of the inhalation risks, windblown dust particles can land on nearby streams, adding both unnecessary sediment and heavy metals to the watershed. Dust can also settle on snow, decreasing the albedo and accelerating melting rates, causing further threats to winter recreators.
There has been substantial pushback to mining operations in the canyon, including over 27,000 petition signatures, legal opposition from local governments, and outcry at numerous public hearings and comment periods.
In 2022, Granite Construction’s proposal for a large-scale mine in the canyon was withdrawn, and a request to mine on a smaller, 20-acre expansion of the existing I-80 South Quarry was approved a few months later. Earlier this fall, a revised air quality permit for a 6-acre operation was also approved, and was subsequently appealed by the City of Millcreek. Additionally, some organizations are concerned that Granite Construction could operate under a small-mine permit for the time being, and eventually scale up to their originally proposed size.
As Millcreek works to appeal this permit, it is imperative that residents continue taking a stand. Residents are urged to attend hearings and participate in public comment periods to keep the unwavering public opposition to this project visible. Local pushback has been successful so far in slowing the progression of this expansion project, but this story is far from over. Though the growing demand for infrastructure is not lost on many Utahns, Parley’s Canyon is not a suitable location for an open-pit mining site. The risks are substantial, and there should never be a price tag on human or environmental health.
