Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3504.21 What are the minimum royalty rates?

(a) Phosphate

5% of gross value of the output of phosphates or phosphate rock and associated or related minerals.

(b) Sodium

2% of the quantity or gross value of the output of sodium compounds and related products at the point of shipment to market.

(c) Potassium

2% of the quantity or gross value of the output of potassium compounds and related products at the point of shipment to market.

(d) Sulphur

5% of the quantity or gross value of the output of sulphur at the point of shipment to market.

(e) Gilsonite

No minimum royalty rate.

(f) Hardrock Minerals

No minimum royalty rate.

(g) Asphalt

25 cents per ton (2,000 pounds) of marketable production.