==========
The Secret Knowledge of Gathering perk doesn't seem to work well with mining. It rarely gives any more yield than mining with a character who does not have the perk.
Steps to reproduce
----------------------------
Mined a whole bunch!
Expected result
-----------------------
Expected to get more ore, with triggers of the ability going off like it does with gathering from plants. As per the description, there should always be at least one extra resource no matter what.
Actual result
-------------------
The perk only seems to trigger if the very last hit on a mining rock produces ore. If there is still more to mine, the script never triggers, and if you do not produce ore on the very last hit, the script never triggers. The only way to produce extra ore is for the placable destroying hit to also be a strike that produces ore.
Screenshot(s)
--------------------




---------^^^^^ Coal ^^^^-------------vvvvv Nitharit vvvvv-----------





Notes
---------
The above screenshots are of a complete mining of a coal node from start to finish, with the feat triggering at the last strike. Then screenshots of a complete mining of a nitharit node from start to finish, with the feat not triggering at all.
This has been tried on mostly coal, iron, salt, mithril, adamantine and various gems. No variation between any resource.