Mount Marion is located 40 kilometers southwest of the Kalgoorlie mine in Western Australia. It is the world's second largest high-quality spodumene mine in production. The project was put into production in February 2017, with an annual output of about 450-480 thousand tons of lithium concentrate.

| 
 RESOURCES(2016)  | 
|||
| 
 Category  | 
 Lithium Concentrate  | 
 Li2O  | 
 Fe2O3  | 
| 
 Indicated  | 
 28.9  | 
 1.35%  | 
 1.06%  | 
| 
 Inferred  | 
 48.9  | 
 1.38%  | 
 1.10%  | 
| 
 Total  | 
 77.8  | 
 1.37%  | 
 1.09%  | 
According to the 2016 resource exploration data, the Marion lithium mine project has a mineral resource of approximately 77.8 million tons, containing 1.37% lithium oxide and 1.09% iron oxide, and is expected to maintain production for approximately 30 years.
The company holds a 50% stake in Mount Marion's parent company RIM.