How did tribes gather royalties on coal mining?

The Native American groups who have coal deposits on their lands can gather royalties if they have established what is called a coal lease.

Explanation:

Many of the Native American reservations in the United States have coal deposits. The Department of the Interior says there are twenty-five such reservations belonging to groups like the Navajo, Hopi, and Crow.  The Navajo and Hopi, for example, have coal leases that allow them to collect money from companies and other organizations for the extraction and use of the coal on their lands. States and private owners can also have coal leases. The coal leases are important to the Navajo and Hopi financially. The royalties and lease payments to the Navajo Nation make up about one-fifth of the tribe’s general-fund budget from mines like Kayenta. For the Hopi reservation, close to 87 percent of their 2017 general budget will be from coal-related royalties and fees (Rainey, 2017). The mines and power generating plants also provide jobs on or near the reservations.

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so basically it is not clearly and consistently imposed