The result of mining depends on the number of tokens:

0.01% — probability 25%, max. reward 25000 MINT
0.02% — probability 37.5%, max. reward 37500 MINT
0.03% — probability 43.75%, max. reward 43750 MINT
0.04% — probability 46.875%, max. reward 46875 MINT
0.05% — probability 48.4375%, max. reward 48437.5 MINT
…
100% — probability 50%, max. reward 50000 MINT