SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Details)	3 Months Ended
	Apr. 30, 2022 USD ($) item contract MT	Apr. 30, 2021 USD ($)	Jan. 31, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Royalty Revenue	$ 14,195,489	$ 9,402,167
Base overriding royalties, first tier portion percentage	90.00%
Base overriding royalties, first tier shipment ceiling (in million tons) | MT	4
Base overriding royalties, second tier portion percentage	85.00%
Base overriding royalties, second tier shipment ceiling (in million tons) | MT	2
Base overriding royalties, third tier portion percentage	25.00%
Base overriding royalties, third tier shipment threshold (in million tons) | MT	6
Base overriding royalties, number of volume thresholds for transaction price | item	4
Base overriding royalties, volume threshold for transaction price | MT	1
Accrued income receivable	$ 2,313,994		$ 4,631,510
Number of customer contracts | contract	1
Contract asset	$ 4,402,490		1,431,633
Contract asset	4,402,490		$ 1,431,633
Contract liability	0
Base Overriding Royalties
Revenue from Contract with Customer [Abstract]
Royalty Revenue	8,232,221	5,639,153
Bonus Royalties
Revenue from Contract with Customer [Abstract]
Royalty Revenue	5,722,327	3,572,341
Fee Royalties
Revenue from Contract with Customer [Abstract]
Royalty Revenue	$ 240,941	$ 190,673