(Grade of Ore Mined)
10.00% K20 or less 2.00%
** **
17.09% K20 or more 5.00%
*(Mined by conventional methods and based on the K20 grade, as sylvite.)
**Intervening ore grade increments are to be proportioned to the foregoing royalty rate limits and royalty rate to be computed according to the formula:
Royalty rate = 2.00% + [(% K20 grade mined - 10.00% K2O) x 0.423077], the K2O grade mined and royalty rate to be determined to the nearest 0.00 percent.
Langbeinite 2.50%
N.M. Admin. Code § 19.2.3.12