California Code, Insurance Code - INS § 1971

(a) More than half in value of the subject matter is actually lost by such peril, or would have to be expended to recover it from the peril.

(b) The subject matter is injured to such an extent as to reduce its value more than half.

(c) The subject matter is a ship, and either the contemplated voyage can not be lawfully performed without incurring either an expense to the insured of more than half the value of the ship abandoned or a risk which a prudent man would not take under the circumstances.

(d) The subject matter is cargo or freightage and the voyage can not be performed, nor another ship procured by the master to forward the cargo, within a reasonable time, with reasonable diligence and without incurring an expense to the insured of more than half the value of the subject matter or a risk which a prudent man would not take under the circumstances.  But freightage can not in any case be abandoned unless the ship also is abandoned.