How to Charge the Mining Gloves
If you own the mining gloves, then on the mining screen you should see an icon of the gloves you possess. Clicking that icon will equip them.
Keep in mind that for them to be useful, they need to have charges — and you have to purchase charges from the shop screen.
If you want to unequip the mining gloves, you can click the equipment icon on the top right of the screen (it should show a ‘hat’ icon, with the hat that’s currently equipped in your active equipment set).
This will show your currently equipped gear. Click the gloves to unequip them.