Depending on your preferences for Gold producers, or exploration/development companies?
Producers - the likes of EVN, NST, AGG, SBM, RSG, SAR, RMS, KLA, OGC, RED.
Others - GOR, CYL, NML, CHN, AZY, IRC, AUC, WWI, AZM, plus so many more already discussed on the thread.
Sovereign risk should always come to thinking too, do you want Australian based projects, Africa, Europe?
A few to look into, i've probably missed a heap of others too.