The Tintic Mining Mill, aka Standard Mining Mill, outside of Genola, Utah was shut down in 1925.  It opened  in 1921 to process ore from Utah's Tintic Mining region.  Technological advances made it more cost effective to ship the ore north for processing.  In recent years it has become a favorite site for Graffiti artists who clearly have done an exceptional job of decorating the decaying concrete structures with spray paint, My study of Rock Art of Ancient Americans, I can also categorize this as Rock Art. 
In July 2019, the site was official closed by the Bureau of Land Management due to hazards on the property.  Aside from being steep and scree covered, the land is tainted with heavy concentrations of arsenic and lead.  In the past, the BLM turned a blind eye to those coming in to decorate the remnants, and those who came to photograph the graffiti.  On August 28, 2019 it was announced that they are enforcing trespassing with fines in the range of $600 for who ignore the new gates and signs.  These photos were taken in 2019 and considering all the new art, I will attempt to gain authorized entry in 2021 to photograph the new art that will have been added to the art posted below.  Photos from my 2017 photographic documentation
Images posted below were taken in March 2020 after BLM took steps to discourage unauthorized access to this facility due to high levels of arsenic and lead in the soil covering the very steep mountain side, and high concentrations of these toxins in the pools at the bottom of the facility.
Archaeologists definitively declare we have no understanding of the meaning of the Petroglyphs found throughout Utah and throughout the world.  
Likewise, the same should be considered true for trying to define the meaning of much of the graffiti found at the Tintic site.  Though some seem obvious, there are interpretations that differ from person to person.  Some of the panels are reminiscent of modern art I've viewed in galleries, while others are a simple declaration.  Enjoy the creativity!