Bureau of Indian Affairs approves Standing Rock Sioux Tribeâs business, residential, wind and solar leasing regulations under the HEARTH Act Tribe now authorized to enter into leases on its trust lands without further approval by the BIA Author: News Release Office of the Assistant Secretary - U.S. Department of the Interior Indian Affairs The Bureau of Indian Affairs (BIA) announced yesterday that it has approved leasing regulations submitted by the Standing Rock Sioux Tribe, a federally recognized tribe whose reservation is in North and South Dakota, under the Helping Expedite and Adva...