Here you can find some information where you can trade your mining proceeds.
These are not every exchange in every case, just a guideline of places you can start looking.

Coin Symbol Coin Name Exchange
CRW Crowncoin C-Cex
DVC Devcoin Bter
HUC Huntercoin Poloniex
I0C I0Coin Cryptopia
XMY Myriad Cryptopia
NMC Namecoin Cryptopia
SYS Syscoin Poloniex
UNO Unobtainium Cryptopia
TRC Terracoin Cryptopia
ARG Argentum Cryptopia