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Despite the fact that the TzHaar City mine only has three gold rocks, it's still an excellent place to mine for gold ore because of the limited mining competition and the closeness of the mine to both a bank and a furnace.
This mine also contains three silver rocks, so you can augment your gold mining a bit to help pass the time while waiting for the ore to respawn. Or, if you have the proper molds and gems, you can smelt the ore into bars at the furnace and then craft some jewelry.
Also, this mine is extremely close to the gold rock area near the entrance of the Karamja Volcano, which has four additional gold rocks. So, you can easily dash back and forth between the two locations, having access to seven gold rocks total. The Karamja Volcano Mine area is accessible by all players, but TzHaar City is a members-only area.