Editing VGO's Guide to Warframe (section)

====Mining====
* In general, the harder a deposit is to get to the greater the probability of a higher value yield--but it's not certain. There is still plenty of low-level stuff mixed in with the higher-level stuff. Still, the easiest way to get the more valuable yields is to go into a cave--if you can find your way out.
* the drill you get from Cetus requires you to trace around the edge of a deposit, with the yield depending on your accuracy; the one you get from Fortuna requires you to find 1-3 drill spots on the deposit and hold down the button just long enough for the trace to stop within the brackets.
* Some of the deposits on Cetus require higher level drills. The drill from Fortuna works with all deposits. It is also upgradable with a silencer. Once the silencer is equipped, it won't alert nearby enemies.
* Sometimes while drilling a node, you'll see a large bracket [    ] and then a much smaller one, [|]. If you hit the smaller one, you're guaranteed to get gems in addition to the regular deposit. That means that on a deposit with 3 nodes, you could get 4 rewards, assuming they all have the option, and you get it every time.
* On the Plains of Eidolon (Earth) and the Orb Vallis (Venus), Red deposits are minerals, and blue ones are gems.
* On Deimos, yellow deposits are minerals.