The following came from the Utah BLM website. Use at your own risk! The BLM is not liable for anything on their websites.
Annual Maintenance of a Mining Claim or Site
Examples of Work That Qualify As Assessment Work
1.A building that benefits and improves the claim. Bryan V. McCraig, 10 Colo 309, 15 P 413 (1887).
2.Reasonable value of meals to miners who receive board in addition to salary. Fredricks v. Klauser, 52 Or 110; 96 P 679 (1908).
3.Value of blasting supplies. Id.
4.Construction of road to mining claim. U.S. v. 9,947.71 Acres of land, More or less, in Clark County, State of Nev., 220 F. Supp. 328 (DC Nev 1963); Silliman v. Powell, Utah 642 P2d 388, 393 (1982).
5.Maintenance of access roads to mining claim. Pinkerton v. Moore, 66 NM 11, 340 P2d 844 (1959).
6.Sinking shafts and running tunnels or drifts. James v. Krook, 42 Ariz 322 (1933).
7.Installation of mining machinery or fixtures. Id.
8.Employment of a watchman when necessary to protect structures or property used in developing a claim. Ingersolt v. Scott, 13 Ariz 165, 108 P 460 (1910).
9.Drilling and removal of samples from a mining claim. Eveleigh v. Darneille, 81 Cal Reptr 301 (Cal App 1969).
Examples of Work or Improvements That Do Not Qualify As Annual Labor on a Mining Claim
1.Removal of water from a mine for inspection of prospective buyer. Evalina Gold Mining Co. v. Yosemite Gold Mine Co., 15 Cal App 714, 115 P 946 (1911).
2.Erection of a house outside the boundaries of a claim for the shelter of miners. Remington v. Baudit, 6 Mont 138, 9 P 819 (1886).
3.Eating utensils, groceries, and bedding. Fredricks v. Klauser, 52 Or 110, 96 P 679 (1908).
4.Amount paid for horses used in development work; however value of their use will qualify. Id.
5.Payment for iron rails or tools, but their value in developing the mine may qualify. Id.
6.Material taken to a claim but not used. Id.
7.Sampling and assaying. Bishop v. Baisley, 28 Or 119, 41 P936 (1895).
8.Reconnaissance surveys of mining claims. Pinkerton v. Moore, 66 NM 11, 340 P2d 844 (1959).
9.Use of a claim to deposit wastes from other claims and building a flume to carry tailings to claim. Jackson v. Roby, 109 US 440 (1883).
10.Employment of a watchman to prevent relocation. Justice Mining Co. v. Barclay, 82 F 554 (CC Nev 1897); or where there is no valuable improvement or machinery to protect. James v. Krook, 42 Ariz 322, 25 P2d 1026 (1933).
Access Roads and Qualifies
The construction of access roads as well as improvement of existing access roads qualifies as assessment work, even though the road is not on the claims. For example, the cost of installation of water bars on an existing road to prevent erosion and reduce the need to rehabilitate or maintain the road is sufficient improvement to qualify as assessment work. United States v Herr, 130 IBLA 349, 365-65 (1994).
From: Mineral Law, by Terry S. Maley