RE: novadx stream
Impairment is a complex accounting issue. I would say both issues you noted above are behind the issue as impairment is only recognized when the recoverable amount (higher of fair value - cost to sell or value in use) is below book value. This would "Novadx stream is written-off and the money is gone".
Recall, that the write off is only from an accounting perspective - the stream still exists. It is my understanding from the call that Nolan and Co. will be attempting to extract as much value out of the Novadx stream as possible and expects to recover more than that amount the stream was written down to (but how much is anyone's guess). Under IFRS, previous impariments can be reversed into income, so if events or cirumstances change then the Novadx stream will be written back up (unlikely).
When the stream is finally settled - the company wil recognize a gain or loss between the difference of the revised book value (after impariment) and the final consideridation for the stream.
Below is the accounting standard.
--
Evaluation of the carrying values of each mineral and oil and gas interest is undertaken when events or changes in circumstances indicate that the carrying values may not be recoverable. If any indication of impairment exists, the recoverable amount is estimated to determine the extent of any impairment loss. The recoverable amount is the higher of the fair value less costs to sell and the value in use. Estimated values in use are calculated using estimated production, sales prices, and a discount rate. Estimated production is determined using current reserves compiled by qualified persons. Estimated sales prices are determined using an average of long-term commodity price forecasts by analysts. The discount rate is estimated using the average discount rate used by analysts to value base metal and energy companies. If it is determined that the recoverable amount is less than the carrying value then an impairment is recorded with a charge to operations.
An assessment is made at each reporting period if there is any indication that a previous impairment loss may no longer exist or has decreased. If indications are present, the carrying amount of the mineral interest is increased to the revised estimate of its recoverable amount, but so that the increased carrying amount does not exceed the carrying amount net of depletion that would have been determined had no impairment loss been recognized for the mineral interest in previous periods.