If within a town plat the homestead must not exceed one acre in extent, and if not within a town plat, it must not embrace in the aggregate more than one hundred sixty acres. If the homestead is claimed upon any land, the title or right of possession to which was acquired or claimed under the laws of the United States, relating to mineral lands, then the area of the homestead, if within a town plat, shall not exceed one acre, and if without a town plat it must not exceed forty acres, if title thereto has been acquired as a placer claim, but if the title has been acquired under the laws of Congress as a lode mining claim, the area of such homestead shall not exceed five acres.
SDCL 43-31-4