First “faucet” that actually has strategy and tradeoffs to take into consideration. With the deeper you go the more valuable the ore but you must make it back to the surface with your jetpack or you lose what you mined. Plus, don’t forget to keep your “forge” filled so that it can double every 20 hours or so. Remember not to fall further than 4 blocks when you are descending. Try to use rocks or unmined blocks as your areas to break your fall instead of buying platforms.
I’ve also found that the deeper you go, the amount you actually mine is worth more than a “rescue refill of rocket fuel” so it actually can work out to your benefit to mine deeper and then “fail” to reach the surface and pay the 100 satoshi to get a refill of fuel.