I'm sure we've all been there, you're mining/excavating for one specific thing and have to keep dumping your inventory because it gets full of stuff you don't need. Here's my suggestion to fix this:
In the Y phone, you should have a new "Filter" app. Here you get a list of everything you can find while excavating/mining, and can choose to tick/untick these items depending on whether or not you'd like to receive them. You also have a master on/off switch to turn the filter on or off as you please. This will NOT affect the chance of you actually getting these items. When you excavate or mine, you still get the same chance as anyone else to find something. However, any time you come upon something that you turned off in your filters, rather than adding it to your inventory, it would display something like this:
"You have found sand, which has been automatically discarded due to your filter settings"
This item would then just not be spawned into your Y inventory or into the world at all - as if you had only found worthless rock. Thoughts? Ideas? Support?