there is only one true fastest way here the others are mostly lame versions. on earth u can choose between 2 Areas who wield much more Spinmetal/hour. The first is the area of the Spidertankpublicevent it contains 2 Types of chests and lots of spinmetalspots. What means chestttypes u might ask? Well there are 3 different types of chests: exploringchests (this type will only switch between a few number of locations with slightly different spawnspots); Cavechests (this type is the most common as it allways spawns in one of a few caves/rooms and what is normally looted); specialchests (this type only spawns in one room or small area normally guarded by a Level 16+ Enemy the most famous one is the chest on Skywatch in the room under the helicopters) 2nd location and the only known to have all 3 types of chests on earth is Skywatch there are a bunch of rooms and caves where the first chest spawns than on the left and right side of the Hive-ship-kind thing leftside of the well known lootcave of the past ;) there will spawn explorerchests (they are the golden ones u often seen outside;)) and of course the specialchest i mentioned before with the hiveknight or ogre and of course there are some spinmetalspots too. the best location for farming helium coils is the startarea. There are 2 different cavechestspots at the startarea one in the caves so on of the right side and one on the left side where u get the sparrowlink in the first moonstory. Also there are explorerchests on the pipthing u can easy jump on on the right end where it is broken. Alltogether with some helium coil spots all arround this area you don't need to walk long before u get something to loot. The Venus spot is surely the right one there will be sometimes explorerchests near embercaves but the caves itself will be the best way to get spirit bloom. On Mars however why u take a place where u have to travel so much? The bunkersystemarea next to the startarea contains 2 cavechestlocations one in the bunkersystems and one in the wallrooms so u can go in circles and loot 4-6 Chests per circle + Relic Ironspots near the bunkersystem. In the end beside helium coils all of the materials are very easy to farm fast and combined with publicevents where u wil lget the chance of some ascended materials too much fun this way.