Ranch 2 motor mission...mining?

Well to be short when i got the mission to get 2 motors for them so that they could power some sort of sawmill, i asked for any advice then this line from the last mission came up were he asked for 75 rocks to get fireplaces up and going.

I haven’t figured out how to get a screenshot on here so i can’t provide visual representation.

And its near the latest experimental build that is : 0.C-6536