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~ Five acres or less of surface disturbance usually requires a notice: The notice musrdescribe the proposed acflvities, the location on the ground, the start-up date, road access and constmetion; if any; and reclamation measures.' Receipt and review of a notice is not a Federal action; tliere- i fore; there isito requuemeitt for the preparation j of an EA' or EIS: Approval by BLM is not ~. required'for a noflce. .There is no requirement for notifying the BLM of casual use activities. Casual use activities aze those that cause only negligible disturbance of the public lands and resources: For example, ~ activities that do not involve the use of earth-. moving. equipment or explosives. may be consid- eyed casual use. T-~xgloration-andmruringactivitiesirrBl..lvl -- wilderness study areas (WSA's) are subject to regulations in'43 CFR 3802. The BLM Interim . Management Policy and Guidelines for Lands ! Under Wilderness Review (BI.M Handbook !I 855.0=1; November 10,1987) also.gives roles Concerning mineral activities in WSA's: The • I Hiles require a plan of operations for all activities other than what could be considered casual use '(see 43 CFR 3802.1=2). Reclamation is a re- quirement'forall surface-disturbing activities in WSA's: -Where required, reclamation mast be completed to the point that mining acdvities.are substantially unnoticeable by the time the Secre- lacy of the Interior makes recommendations for wilderness designationto the President. There- fore, each BLM State Director has seta date for y completion of reclamation in WSA's in that State. Ail recommendations of the Secretary of i the Interior to the President onBLM-adminis- tered lands are to be made on or before October 20, 1991. However, not all States are involved in the wilderness study program. j 24 with the longer side lines parallelto'thevein or lode (see Figure l). Descriptions are by metes and bounds surveys (giving length and direction of each boundary line). Federal. statute limits their size to a maximum of 1,500 feet in.length along the vein orlode. Their width is a maxi-• mum of 600 feet, 300 feet on either side of the centerline of the vein or lode. -The end lines of the lode claim must be parallel to qualify for underground extralateral rights. Extralateral rights. involve the rights to minerals that extend at depth beyond the vertical boundaries of the claim. Placer Clairits: Mineral deposits subject fo placer claims include all those deposits not subject to lode claims. Originally; these included only deposits of unconsolidated materials, such as sattd-and gravel, eontainingfreegold or other minerals: By Congressional acts and judicial intetpietations,roany nonmetallic bedded or layered deposits, such as gypsum and High calcium limestone, are also considered placer deposits. Placer claims, where practicable, aze located by legal subdivision (forexample: the E 1/2 NE 1/4 NE 1y4; Section2, Township 10 South, Range 21 East, Mount Diablo Meridian): Phe maximum size of.a placer claim is 20 acres per locator (see Figure 2). An association of two locators may locate 40 acres, and three may locate 60 acres, etc. The maximtim area of an association placer claim is 160 acres for eight or more persons. . Howevei; the maximum'size of an association placer claim in Alaska is limited to 40 acres . under State Iaw. The maximum size of a placer claim for corpora- tions is 20 acres per claim. Corporations may not locate association placer claims unless they are in association wiih other private individuals or other corporations as co-locators.