I often find the phrase "issue of quantum of" in the rulings made by the U.S courts like these:
The substance of the argument is that the court deciding the issue of quantum of damages would be better suited to decide the proper scale of costs.
He asked the court to determine the issue of fault ahead of the issue of quantum of damages.
However, on the issue of quantum of sentence, the High Court found favour with the submission made by the counsel for the appellant.
Could you kindly tell me what the phrase "the issue of quantum (of)" means? I looked up the phrase in the dictionary but I couldn't find any relevant information.