The Carbonite.Gathermate2_data module is missing. Please see the below link.

Steps to reproduce:
From the Interface menu, click "Import mines from GatherMate2_Data".

I highly recommend using Spinx's distrobution of gathermate2_data because this has all of the nodes in classic. The zones that were torn apart with the release of Cataclysm (v4) were then re-organised in BfA (v8). Classic was released subsequently with old maps but new attributes meaning that neither the retail nor the old Classic data points for gathering were correct.

Sphinx's distrobution: https://www.curseforge.com/wow/addons/spinx-gathermate2-data-classic

Yes i know this data is missing. This is work in progress. Just wait a bit more.

Well done. You have to right-click the map and select "Show Mining Locations".
I did not test the herbs but I assume they work as well. I also double-checked to see if the gathermate2_data between sphinx's and your editions match up and they seem to.
Attaching results and closing issue.

Added Carbonite.Gathermate2_Data with gather data for Classic (Mining and Herbalism not from Sphinx) should be accurate.

(This is related to issue #30)

Some of Sphinx nodes were of the overlays so this looked weird on Carbonite. Good that i have some older data archived ;)