Mining of stone, copper, silver, gold and plat
So...
In the shop you can buy pickaxes (white, blue and red white drops 1-3 items, blue drops 3-6 items and red drops 6-9 items) and 'mine shafts' (Domestic (X1 chance multiplier), Commercial (X2 chance multiplier), Industrial (X3 Chance multiplier); Ultimate (X5 chance multiplier)). Once you have them place a mine shaft and enter it with e. Once inside you can mine ores to get materials (stone 1/2 chance of finding (Building material), tin 1/4 chance of finding (White tools eg.Generic RPG sword), Blue John 1/5 chance of finding http://en.wikipedia.org/wiki/Derbyshire_Blue_John (Blue Sword), Iron 1/6 chance of finding (Red sword), Cobalt 1/8 chance of finding (Pixel Gun), Gold 1/10 chance of finding and Plat 1/1000 chance of finding (town stones camn be crafted with 100 plat.) which can be used to craft better pick axes, swords and other cool guppins.
I hope I haven't confused your butts off.

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de momoer commented
My super awesome 8bitmmo crafting system
1st each type of mob will drop one crafting material 100 less often than gold. like the lawercats would drop whiskers. Hipsters coffee. Normal game reviewers magazines. And dires sharp foil
2nd 10 dropped materials can be crafted into a block. Whiskers will turn into a pile o'whiskers
coffee into a java block :). Magazines into a recycled stack. And the foil into a cutting block3rd 1 of each material block will be crafted into paper money
4th 10 paper money is worth the equivalent 1 plat in store
5th crafting is done by a crafting block
6th there are two types of crafting blocks one that takes a day to make a PM and cost 2000g
and that takes a hour and cost 15p7th making material blocks are instantaneous
8th also wild mobs only drop material -
Superman(Because why not?) commented
STOP! ANOTHER MINECRAFT COPY! WHEN WILL THE COMMUNITY STOP THE STUPID?