I don't envy you, I'll tell you that for nothing, good luck though, you're gonna need it!

 

500 thousand coal blocks... never gonna happen thats 4.5mil, 100 thousand diamond ore... 10 mil lol

 

Don't be such a wet blanket :p

With hundreds of people mining away for hours and hours every day (which adds up fast) he can get there.

Imagine just 100 people each mining for an hour. That's more then 4 days of mining.

Now imagine 300 people each mining for two hours a day, for a week.

That's almost 6 months of mining.

It adds up quickly, not an easy goal I must admit, but not out of reach :p