The Tintic Mining Mill, aka Standard Mining Mill, outside of Genola, Utah has been shut down since 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 - Studying Rock Art of Ancient Americans, I also categorize this as Rock Art. 
In July 2019, the site was official closed by the Bureau of Land Management due to hazards present 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, effective immediately, they are enforcing trespassing with fines in the range of $600 charged to those who ignore the new gates and signs.  These photos were taken in 2018 and considering all the new art, I will gain authorized entry in 2020 to photograph the new art which is posted below.
Images posted below were taken in March 2020 after BLM took steps to discourage unauthorized access to this facility due to  risks of high levels of arsenic and lead in the soil covering the 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 thenot meaning of the Petroglyphs found throughout Utah.  
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!