I originally posted this in the Oldton Movalpolos section, but I think it will be useful here as well since it shows how to rotate the gates.
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I found a Treasure Chest in Oldton Movalpolos the other day just out of my reach, and I also recently acquired a key off one of the Bugbears. I couldn't leave that Chest just sitting there, so I spent the better part of the day figuring out how to get there. All the information you need has already been posted here but nobody seems to have connected the dots yet. Anyways, here's how to get the 2 Treasure Chests on the upper platforms in K-10.
1. Equip yourself (or bring a friend) with a job that will allow you to escape/warp/teleport out of the mines relatively quickly.
2. Buy 1 or 2 Jars of Firesand (Alchemy) and Prisim Powders if you cannot cast Invis. Bats won't aggro here.
3. Head to K-10 and check where the Treasure Chest is. If the Chest is on the south platform, head to the Newton Movapolos zone at J-12. If it is on the north platform, head to the Newton zone at J-8.
4a. (J-12 zone) Hug the wall to your left. Use invis as necessary to avoid aggro. Eventually you should rezone into Oldton Movapolos right at the south platform. If at F-10 in Newton you run into a gate blocking your way, skip to #5 to read how to open it.
4b. (J-8 zone) Hug the wall to your right. Use invis as necessary. Eventually you should rezone into Oldton Movapolos right at the north platform. If at E-7 in Newton you run into a gate blocking your way, skip to #5 to read how to open it.
5. Rotating the gates- Here is where some people get confused. If there is a gate blocking your way to the Oldton zone, you need to rotate the gate to allow you passage. This is accomplished by zoning into Newton Movapolos at J-8 and following the path (only 1 way to go) to F-6. Sneak is needed for a short tunnel with Dire Bats. Here you will see a Furnace Hatch on the south side of the platform. You must trade 1 Firesand to the Furnace to rotate the platforms. This can be very tricky because of the high level mobs patrolling the entire platform. Only choice is to bring a group to kill them or drop invis, trade item, and reinvis as fast as you can.
At this point the way you came from is now blocked. To get back to Oldton without an escape of some kind is incredibly dangerous and impractical. Just get a friend to come with and get you out. When you trade the Firesand both the F-10 and the E/F-7 gates will rotate 1/4 turn, allowing you passage from either J-8 or J-12 of Oldton to the treasure chest areas.
Hope this helps some of you out!
Edited, Sat Aug 27 19:05:06 2005