On the highest point in Iron Hill was placed the "Iron High" cache. I found it in the summer of 2010 when I first started geocaching but eventually the cache became archived in February of 2011. Recently I was in Iron Hill Park searching for locations to squeeze in a few more caches and came across this cache again. Even though it had been archived the container was still there so I decided to re-use it and moved it further down the yellow trail.
Park in the main Iron Hill parking area near the dog park and follow the paved path up to the left side of the pavilion. Located here is the trailhead for the yellow blaze (yellow/green) trail which skirts a very deep depression on your left--the remains of the old Whitaker Iron Mine. There are 3 splits in the trail before hitting the main yellow trail. Just keep bearing right. Continue on the yellow trail past the FSC-2013 Newark (Iron Hill) cache [GC4MAD3] and stay straight at all other junctions. Continue down the trail until you reach the listed trail junction. You will see a big tree with a red arrow on your left and another big tree with a green and yellow arrow on your right. From here a bushwhack of 100 to 120 feet is needed to get to the cache. NOTE: The large deposits of iron ore in Iron Hill and the abundant tree cover causes satellite signals to bounce a bit so let your GPS adjust to the local conditions. If the signal is still jumpy you may have to use the hint. Overall this will be a 0.6-0.7 mile round trip from the main parking area.
Warning: Mosquito/bug repellent may be required during the summer months. Also some days you may need to watch out for mountain bikers!
All 4 of the new caches are placed on the other side of the park. They can not be accessed from I-95 or 896, so please use the listed parking and plan accordingly. Once all of them are published you can make a 2 mile loop on both marked and unmarked trails to retrieve them and return to the main parking area. I recommend starting with this one, then do "Black and Blue Bison in the Woods"[GC5W149], "Boulder Dam"[GC5W11D], and finally "The Roots of all Evil"[GC5W0XG].
Have fun and happy caching!
Congratulations to annyw_99 for first-to-find!
Update as of 9/2/2022> I checked on this cache today. No maintenance needed. Still good to go. I also noticed that some of the trail posts have been removed.