Well most of the chests are the exact same as the original Solar Frost, but I will share my route, which has 4 tier 2s (including corn) and 8 tier 1s. First, you get a corn chest and head to the tunnel the exact opposite of the giant icicle sticking up from the ground. It is split into 2 paths, take the one to the right. Make a left turn and head straight. There will be a tier 1 under the table. On the right, there is an entrance to a desert-like room, with one trap chest (do not open), one tier 2, located in a dark spot in the wall, and a tier 1 on top of the palm tree.
I escape that area and walk up the stairs to grab a tier 1 chest in a house, and on top of that house, there is a tier 2, but make sure not to fall in as it is a 2 block deep hole. Next, continue on forward. You will see a house-like area with 2 tier 1s, a crafting table and some furnaces. Head to the left, and at the end of the mine there is a tier 2. Then, one branch before the end, there is a tier 1 in the ground, and continue looking around the mine and you will find a 2 x 1 block entrance to a small room with some furnaces and a double tier 1 chest. This is the end of the route, but there are various other chests you can get scattered across the map, that I may add in an update later on.