Crystal fragment (100% chance of dropping).Each map has an achievement to find all the golden chests (hence why gold chests always spawn every 10 minutes). Golden chests spawn in various locations, both in easily seen spots and in ridiculously hard spots that require you to go behind structures. Inside walls that is visible or hidden by small objects such as trees or small rocks.Around the edges of platforms/islands/hills.Wooden chests spawn in locations that are easily seen. I have never seen a golden chest disappear unless it's refreshing it's spawn at 10 minutes from the hour. I've seen wooden chests disappear in front of my eyes and I have no idea why.

A gold chest will never spawn in place of a wooden and vice versa. Sometimes a lot of wooden chests will spawn, sometimes only a few. one map may spawn a load of wooden chests at the start of the hour, another map may spawn the chests 30 minutes past the hour. e.g one spawn location will have a chance to spawn a chest every hour from xx:00 while another location has a chance to spawn a chest every hour from xx:10. Each spawn location has their own timer for when to spawn.Has a chance to spawn every hour or every 10 minutes or every 15 minutes (really hard to keep track of it, sometimes there are times where there are no wooden chests on all channels of a map for 20-30 minutes).I have a few theories of when they spawn: Wooden chests has a chance to spawn in one of its spawn location. I'm not sure if standing on the chest spawn spot blocks the chest from spawning. There has been a few cases where the chest do not respawn on the 10 minute mark. Golden chests spawn every 10 minutes form the hour in its spawn locations. There is a lack of information on chests online so here's what I know after hunting around.

Pharaoh's treasure chest maplestory