Which symbol or item is mandatory on a survey map for a mining claim?

A north arrow is a critical component of any survey map, including those for mining claims, as it indicates the orientation of the map in relation to the cardinal directions. This helps viewers understand the layout and location of the claim concerning other geographical features. Accurate orientation is essential for navigation and legal descriptions, as it enables landowners, miners, and regulators to locate the claims precisely and ensure compliance with regulations.

Including a north arrow serves multiple purposes, such as facilitating communication among professionals in surveying, mining, and land management. It assists users in interpreting other symbols and features on the map effectively. Meanwhile, the other options, while they may provide useful information, do not hold the same level of necessity for the approved format and legal requirements of mining claim surveys.