Data as at 18 October 2026 · from Western Australian Government registers and open data

Western Australian mining project · Operating

Mt Weld REE / Lynas

Mt Weld REE / Lynas is a Western Australian mining project (operating) in MINEDEX, owned by Lynas Rare Earths Limited 100%, on 11 current tenements held by LYNAS KALGOORLIE PTY LTD; MT WELD MINING PTY LIMITED. Commodities: Rare earths, Niobium, Tantalum, Yttrium, Neodymium, Praseodymium, Phosphate, Zircon.

MINEDEX project: J00772
Stage: Operating
Owners (MINEDEX): Lynas Rare Earths Limited 100%
Tenement holders: LYNAS KALGOORLIE PTY LTD
MT WELD MINING PTY LIMITED
Parent groups: Lynas Rare Earths
Commodities: Rare earths, Niobium, Tantalum, Yttrium, Neodymium, Praseodymium, Phosphate, Zircon, Dysprosium
Rehabilitation liability: Its rehabilitation liability is in the MCF Mining Index (subscribers): the Mining Rehabilitation Fund estimate, its trend since 2014, company provisions and closure-plan costs

Resources and reserves

Commodity	Resources	Reserves	Latest estimate
Rare earth oxides	147 Mt at 3.4%, 5.0 Mt contained	32 Mt at 6.3%, 2.0 Mt contained	30 June 2026
Phosphorus pentoxide	75 Mt at 8.0%, 6.0 Mt contained	—	6 October 2004
Zirconium oxide	75 Mt at 0.30%, 227 kt contained	—	6 October 2004
Yttrium oxide	75 Mt at 0.09%, 68 kt contained	—	6 October 2004
Niobium pentoxide	75 Mt at 1.1%, 809 kt contained	—	6 October 2004
Tantalum pentoxide	75 Mt at 0.02%, 18 kt contained	—	6 October 2004

Current MINEDEX estimates over all the project's sites; resources may include reserves. MINEDEX (DMPE), CC BY 4.0.

Mine closure plans

Site	Operator	Latest plan approved	Plan (PDF on GeoDocs)	Closure year
TSF 3 and Production Expansion Mt Weld Rare Earth Project	Mt Weld Mining Pty Limited	7 February 2018	TSF 3 and Production Expansion Mining Proposal Mt Weld Rare Earth Project	2031
Mt Weld Rare Earths Project	Lynas Corporation Limited
Lynas Rare Earths Processing Facility - Kalgoorlie Mine Closure Plan (Version 1, Revision 1)	LYNAS RARE EARTHS Limited

EPA Ministerial Statements

MS 1181 Lynas Kalgoorlie Rare Earths Processing Facility, MS 476 Proposed Rare Earths Mining and Beneficiation at Mt Weld, Laverton and Secondary Processing at Meenaar, near Northam (s46)

Tenements

Tenement	Holder	Status	Expires	Commodities	Hectares
M 38/58 Mining lease	MT WELD MINING PTY LIMITED	Granted	25 November 2026	Rare earths, Niobium, Tantalum, Yttrium, Neodymium, Praseodymium	928
M 38/59 Mining lease	MT WELD MINING PTY LIMITED	Granted	25 November 2026	Rare earths, Niobium, Tantalum, Yttrium, Phosphate, Zircon	857
M 38/326 Mining lease	MT WELD MINING PTY LIMITED	Granted	26 November 2033	Rare earths, Yttrium, Neodymium, Praseodymium, Dysprosium, Niobium	104
M 38/327 Mining lease	MT WELD MINING PTY LIMITED	Granted	26 November 2033	Rare earths, Niobium, Tantalum, Phosphate, Zircon, Yttrium	104
G 26/169 General purpose lease	LYNAS KALGOORLIE PTY LTD	Granted	8 October 2041	Rare earths	134
G 38/36 General purpose lease	MT WELD MINING PTY LIMITED	Granted	3 July 2044	Rare earths	57
G 38/37 General purpose lease	MT WELD MINING PTY LIMITED	Granted	3 July 2044	Rare earths	21
G 38/40 General purpose lease	MT WELD MINING PTY LIMITED	Granted	20 March 2046	Rare earths	688
L 38/98 Miscellaneous licence	MT WELD MINING PTY LIMITED	Granted	19 November 2045	Rare earths	64
L 38/224 Miscellaneous licence	MT WELD MINING PTY LIMITED	Granted	13 August 2034	Rare earths	217
E 38/2224 Exploration licence	MT WELD MINING PTY LIMITED	Granted	16 August 2026	Rare earths	570