Document and Entity Information	12 Months Ended
	Jun. 30, 2018 shares
Document and Entity Information [Abstract]
Entity Registrant Name	Piedmont Lithium Ltd
Entity Central Index Key	0001728205
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding	559,030,352
Document Type	20-F
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY