Try this(change to your wallet address), it mines all the nist5 coins and auto exchanges all the ones you don't want for the one you do. At least that's what it's doing on mine. It's prob some auto switch algo thing to mine what's most profitable at that moment...
ccminer-x64.exe -a c11 -o stratum+tcp://yiimp.ccminer.org:3573 -u Cf5vWKLx9bpi5oGCzp5t9WNS6AFxBVFnJJ -p CHC