Typically, a mine claim is a mineral survey that subdivides a strip of land from the public domain into private hands for the purposes of mineral extraction. Presently, mine claims can be used for private residences as well as mining. In Western Colorado, mineral surveys can be 80 to 120 years old. The age of the surveys can sometimes make it difficult to locate and re-establish claim corner monuments. All County Survey has had success in locating original monuments (or evidence thereof) of many mineral surveys.