Anyone else having issues with dig spots not spawning?

I have been trying to dig up my own gems and metals. I have a spot in Newcrest and it has some that spawn each day. 

Here's the issue. I have seen forums saying to go to the Science Lab in Strangerville with the Get To Work pack but there are none there. I have tried many times and I am honestly having issues with about 95% of locations not having them. Including the Grotto Cave in Oasis Springs. I travelled to Brindleton Bay, found a lot then went to go back the next week (in game) and there was nothing there. I am having my sims travel all over but can't seem to find anything. Anyone else having this issue?