Cover - shares	6 Months Ended
	Jun. 30, 2022	Jul. 29, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-38427
Entity Registrant Name	PIEDMONT LITHIUM INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-4996461
Entity Address, Address Line One	42 E Catawba Street
Entity Address, Address Line Two
Entity Address, City or Town	Belmont
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28012
City Area Code	704
Local Phone Number	461-8000
Title of 12(b) Security	Common stock, par value $0.0001 per share
Trading Symbol	PLL
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		17,964,863
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001728205
Current Fiscal Year End Date	--12-31