RE:RE:Dream on this pie-less one It's not just the grades. Just about everything at Pumpkin is easier. Here's my last post about Rosemont on the HBM bullboard.
You may be right Ridgeback ... Maybe truck drivers with special low-light military goggles or low-light truck windows can handle driving in the dark. How did they do it in Iraq? At this point, Rosemont has to deal with some different particulate (light) pollution regulations. Why would anybody think other air pollution particulate types should be treated more easily? See Table 401.1 in the Tucson/Pina County Outdoor Lighting Code. Here's the link,
https://pdsd.tucsonaz.gov/files/pdsd/codes-ordinances/2012_outdoor_lighting_code_.pdf
Rosemont is close to the Mount Hopkins Whipple Observatory within the E1b and E1a zones. This range is highly restricted with low permitted maximum total Outdoor Light Output Lumen Caps per acre. Compare other rural parts of the county (just around 10% light allowed). But for now, location, location, location is big in Arizona.
I've hiked to the top of Mt. Wrightson at 9453 ft., the highest peak of the Santa Rita range though I had some difficulty because I could not get to the trailhead at dark, as the road from the north was chained off until morning. On the mountain you can see 360º all around almost a mile above the Arizona plane. Took some great ridge after ridge landscape pictures. They love this place. After sunset, on the top of the mountain, it's like looking down a dark hole all around you. About two miles to the west is Mt. Hopkins at 8586 ft., just 867 feet lower. From the northeast of the observatory, is the proposed Rosemont mine, less than 15 miles away. From my memory, the line of sight to where Rosemont is envisioned to be, the Santa Rita mountain range drops down below to the northeast. Their darkest and so the best and important view is to the east and northeast.
That was in the late 80's but it's still been very protected. People has envisioned a copper mine at Rosemont for decades but these astronomers have political clout . And just wait until TESS telescope is launched in a couple of years. All hands will be needed to verify the many more new exoplanets and they will be in all directions, much closer than KEPLER's discoveries.
They maintained an old war scorebook here,
https://www.sao.arizona.edu/FLWO/LIGHT/pollution.html
How many lawyers, engineers and electricians would it take to change a light b̷u̷l̷b̷ source at Rosemont?
Are you really sure?