Document And Entity Information - shares	6 Months Ended
	Sep. 30, 2022	Nov. 04, 2022
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Entity Registrant Name	Rocky Mountain Industrials, Inc.
Entity Central Index Key	0001556179
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	No
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	false
Entity Filer Category	Non-accelerated Filer
Entity Interactive Data Current	No
Entity File Number	0-55402
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	46-0750094
Entity Address, Address Line One	6200 South Syracuse Way
Entity Address, Address Line Two	Suite 450
Entity Address, City or Town	Greenwood Village
City Area Code	720
Local Phone Number	614-5213
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80111
Preferred stock, shares outstanding		118.5
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		35,785,858
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,866,832