Just ran a few Mountain deeps and was surprised to find no trove at the usual 3 locations , ran around a bit and found a new one .
I have no idea how to take a screenshot , used to be able to but it’s not working now , plus putting it on the forum is another matter .
Best I can describe it is if you open the map fully and you see the largest blank area / hole in the middle of the map it’s the bottom of that space right in the middle .
Crappy description but I am sure you will find it 
Just found another spot too , first time for this one , when you run down the left hand side of the map to the first two locations , it can appear between those two , so after the first location you have a chance to get it before the old second location .