Roger contracted to buy a silver mining company. After contracting, the price of silver fell sharply making it unprofitable to mine silver. Prior to contracting, Roger was aware that the price of silver could fall sharply which would negatively affect the value of the mining company, and Roger assumed the risk.

In general, when is a contract discharged under the doctrine of commercial impracticability?

In general, when is a contract discharged under the doctrine of frustration of purpose?

Is Roger's contract to purchase the silver mining company discharged under either of these doctrines?