An association of two locators may locate 40 acres, and three may locate 60 acres, etc. The maximum area of an association placer claim is 160 acres for eight or more persons. However, the maximum size of an association placer claim in Alaska is limited to 40 acres under State law. The maximum size of a placer claim for corporations is 20 acres per claim. Corporations may not locate association placer claims unless they are in association with other private individuals or other corporations as co-locators.
Most State laws require conspicuous and substantial monuments for all types of claims and sites.
Other states have other requirements for monuments. Other monuments can be used in California as long as they are conspicuous and substantial. However, it is BLM policy to not use perforated or uncapped pipe as a monument. The legal description method is based on the U.S. Public Land Survey. Descriptions of mill sites are by metes and bounds surveys or legal subdivision.