Mike (Gollum) felt that Polzer's work on the rules and precepts was a very good source reference, in that it had many pieces of the puzzle, like not putting things into writing because of some unfortunate experience(s), as one example. There is no book ON Jesuit treasures that I am aware of, however if one is just wanting to confirm that the Jesuit order was the richest entity in the New World circa 1767, I would suggest to read The Wealth of the Jesuits in 1767,
https://www.jstor.org/stable/980785
pay special attention to the footnotes and end notes, for there we learn that some of the "haciendas" are ore milling plants, and also the California Pious Fund which owned some mines which were operated for the benefit of the missions in California (as well as ranches and farms) as there are good records existing of these properties.
I would also suggest Rudo Ensayo, a description of Sonora by father Juan Nentvig SJ, here is one copy online BUT a key portion has been removed. Note in this excellent geographical work, that all the Spanish mines and mining settlements are listed and described separately from the mines of the missions, which are listed WITH the missions as they would be technically the property of each mission under control of the priests as guardians for the Indios whom were legally not better than children.
Rudo Ensayo: A DESCRIPTION OF SONORA AND ARIZONA IN 1764
There are others, but as far as I know none are specifically about Jesuit treasures. Side thing but if memory serves father Polzer wrote an article for Desert mag attacking and ridiculing the very idea of Jesuit treasures, while also admitting to two instances where fathers were "caught" mining.