Glad you like it! The pickaxe sound is a sample of a pickaxe hitting a rock with an orchestra anvil (from Spitfire's BBC Orchestra) laid overtop of it to give it the definition. Pixabay and Freesound.org are excellent places to get ambient sounds--the latter is where I found the minecart rolling. The actual sound was pretty rough so it benefits a lot from the panning and backgrounding/foregrounding.