ALL of the labor should be for the betterment of the claim. The difference between what is authorized assessment work and assessment work that would be in the making of a defective affidavit of labor / Proof of Labor would be in this wording which shows an intent. Betterment of a claim is when you are doing improvements that go toward finding a profitable mineral source on a claim. This goes back to the idea of holding and working a claim for profit and fits in with the requirements for patent, following the 1st half within 10 days information concerning the character, quality, quantity, and marketing of the mineral or minerals claimed for discovery, the examination shall proceed to patent.
The labor on improvements to roads and paths to claim areas where it is suspected that a new mineral deposit may exist is also authorized, both on and off the claim. This should also involve time to exploration for the hidden minerals and movement of overburden. The exploration can go into the next year. When road improvements or building involve significant disturbance it could put you into a need for a Plan of Operation. If you do not have a Plan it should be kept at a casual use level. This is a large part of why owning a mining claim can not be for recreation, although if you like your work that you do in the hopes to receive a profit is enjoyable to you that is a plus. A woodworker that builds items to sell and make a living and enjoyment still does it for profit.
Hope this helps