M in underlying assumption
Enforcing K against him is unconscionable OR
Other party had reason to know of mistake
Other party caused the mistake
It is present at the time the contract is made
It concerns an underlying assumption
It is mutual
It relates to a basic assumption
There is a mistake
The adversely affected party does not bear the risk
Allocated to him by the parties or court
Seller usually bears risk of minerals in land.
Entered K treating limited facts as sufficient
M in performance
One party does something not required by K
Even if he should have known better, may be able to rescind.
M of Integration
Court may reform writing
Both parties mistaken
Third party rights not infringed upon
Writing fails to accurately express agreement
2 ships. Diff Price.