COMPANY BACKGROUND (Details) $ in Millions |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Sep. 30, 2018
Reporting_Segments
|
Dec. 31, 2018
Reporting_Segments
Facility
|
Feb. 09, 2019
USD ($)
|
|
| Business Acquisition [Line Items] | |||
| Number of mining facilities | Facility | 3 | ||
| Number of reportable segments | Reporting_Segments | 2 | 3 | |
| Dinwiddie Jal Ranch [Member] | Subsequent Event [Member] | |||
| Business Acquisition [Line Items] | |||
| Aggregate purchase consideration, amount | $ 65.0 | ||
| Aggregate purchase consideration, percentage | 51.00% | ||
| Aggregate purchase price allocated | $ 33.2 | ||
| Undivided interest | 51.00% | ||
| Sherbrooke [Member] | Dinwiddie Jal Ranch [Member] | Subsequent Event [Member] | |||
| Business Acquisition [Line Items] | |||
| Aggregate purchase consideration, percentage | 49.00% | ||
| Aggregate purchase price allocated | $ 31.8 | ||
| Undivided interest | 49.00% |