Thanks for the feedback! Gold can mostly be farmed on the stone layer just above the ice, so it might help to head back up there if you're running low. Gems definitely require a bit of luck, but I'm planning to introduce some accessories in future updates that will make gem hunting a little easier.
As for mobile support, currently all the item tooltips rely on hover, which unfortunately only works with a mouse. That means mobile users can't easily see names or descriptions right now. I like your idea of an examine mode where tapping once shows the info and tapping again closes it, and I'll look into whether that can be implemented. On desktop you can hover to see what an item does before crafting, but I'll see if I can bring that info to mobile as well.
Edit: Implemented tooltip support on touch devices (mobile)