Only wands draw vis from nodes, as nodes were also changed massively too. They are now actual blocks in the world, which can be broken (yielding ethereal essence) and also put into jars (At the cost of a LARGE amount of vis) and moved. Neither drawing nor using vis causes flux, though if you're not careful with your initial stick+iron wand you CAN accidentally draw all the vis from a node. Drawing ALL of the vis from a node is very bad for the node, and can eventually destroy it if you abuse the node a lot, or at the very least damage it. And the only way to get more nodes is to spawn new chunks.
Oh, and in case you didn't know, there are now many different types of vis, one for every type of aspect. However, wands can only store the six primals, so the compound-aspect vis only shows up in nodes.
The arcane miner uses pickaxes to mine, and gains properties based on the pickaxe it uses. (For example, stone picks go very slowly. I still need to test if stone can mine iron-level ores, I would guess that they can't EDIT: Actually, apparently they can... The low durability means you'll have to replace them often, though) You can, however, feed them Perditio essentia, which can be made by burning Cobble (or some other things, though there's really no reason not to use cobble) in an Alchemical Furnace, using some fuel in the process. This makes them mine faster, and they consume one perditio for every 16 mined blocks, and one cobble gives one perditio.
Also, it's notable that they mine in a manner similar to quarries. They also will use any enchantments on the pickaxe, so using a silk touch pick will allow silk touch mining.
Also, in case it's not obvious, the pick used takes durability damage as normal, so 1 block = 1 durability unless it has Unbreaking. Also, drills don't work. I tried.
EDIT2: Okay, so apparently you can also automate the replacement of pickaxes using any NBT-compatible automation method... This includes golems. So, you could easily fill a chest next to it with picks, assign one golem to take out spent picks (the bore doesn't allow them to break completely, instead it simply stops when there's one durability point left) and the other to refill it with picks.
At least its mining speed is affected by block hardness...