XML 119 R77.htm IDEA: XBRL DOCUMENT v3.20.1
GOLD STREAM OBLIGATION - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
oz
GOLD STREAM OBLIGATION  
Transaction price allocated to remaining performance obligations | $ $ 175
Gold stream obligation, rate of gold production to be delivered for initial threshold 6.50%
Gold stream obligation initial threshold quantity 230,000
Gold stream obligation rate of gold production to be delivered after initial threshold 3.25%
Gold stream obligation, rate of silver production to be delivered for initial threshold 60.00%
Gold stream obligation, silver production, initial threshold quantity 3,100,000
Gold stream obligation, rate of silver production to be delivered after initial threshold 30.00%
Average spot rate of gold or silver 25.00%
Term of the agreement 40 years