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PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts - USD ($)
$ in Thousands
Mar. 31, 2022
Mar. 31, 2021
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment $ 79,418 $ 75,729
Ying Mining District [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 58,195 53,651
BYP [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 3,708 3,833
GC [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 15,282 15,765
Other [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 2,233 2,480
Land and buildings [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 59,663 58,581
Land and buildings [Member] | Ying Mining District [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 42,953 41,177
Land and buildings [Member] | BYP [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 2,965 3,047
Land and buildings [Member] | GC [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 12,027 12,369
Land and buildings [Member] | Other [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 1,718 1,988
Office equipment [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 3,777 3,414
Office equipment [Member] | Ying Mining District [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 2,979 2,647
Office equipment [Member] | BYP [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 16 20
Office equipment [Member] | GC [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 516 448
Office equipment [Member] | Other [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 266 299
Machinery [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 10,714 9,903
Machinery [Member] | Ying Mining District [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 8,225 7,114
Machinery [Member] | BYP [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 155 213
Machinery [Member] | GC [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 2,276 2,576
Machinery [Member] | Other [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 58
Motor vehicles [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 2,661 2,489
Motor vehicles [Member] | Ying Mining District [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 2,127 1,917
Motor vehicles [Member] | BYP [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 20 20
Motor vehicles [Member] | GC [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 323 359
Motor vehicles [Member] | Other [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 191 193
Construction in progress [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 2,603 1,342
Construction in progress [Member] | Ying Mining District [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 1,911 796
Construction in progress [Member] | BYP [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 552 533
Construction in progress [Member] | GC [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment 140 13
Construction in progress [Member] | Other [Member]    
PLANT AND EQUIPMENT (Details) - Schedule of Composition of Carrying Amounts [Line Items]    
Plant and equipment