Word or intuitive neologism for "(unhealthy) infatuation with gold"

Solution 1:

I suggest auromania.

Auromania: an obsession with looking for gold.

Example: Many poor unemployed young men in Middle Eastern countries are afflicted with auromania.

[Macmillan dictionary]

In your example:

Doctor Sebastian has diagnosed these Dwarves as suffering from a severe case of auromania.

Edit: You could also say chrysomania as pointed out by Toothrot.
Chryso- is a combining form which means gold and mania means craze, madness, desire, obsession etc.

Solution 2:

Two other answerers have posted it after a comment by user Decapitated Soul but I think the proper way to post someone else's comment as an answer is to make it a community wiki.

Gold fever:
Noun
gold fever (countable and uncountable, plural gold fevers)

(literally) A feverish obsession with seeking gold ore.

[Wikitionary]

Solution 3:

The correct answer is just

"gold bug"

as already given immediately in the first comment.

(Note that like many terms, it can be pejorative, or, perfectly neutral.)

Note - as suggested in comments

• gold mania

• gold fever

are highly-used terms.

Solution 4:

I suggest chrysophilia, which Wiktionary lists as meaning "The love of gold".

You were on the right track with aurumphilia, but there were a couple things to change. One is that "auri-" is the prefix form of the Latin word "aurum". The other is that there's some tendency to discourage mixing Latin prefixes with Greek suffixes, so you'd want the Greek prefix, "chryso-".

Notes: There were two points in the comments I want to address.

1. Edwin Ashworth pointed out that you can mix Latin and Greek roots, like in television. That's right. I was being overly grouchy and pushing one of my pet peeves. There are a lot of very serious words that mix Latin and Greek.
2. Toothrot pointed out a dictionary that lists chrysophilia as a sexual interest in gold and the color gold. It might be good to avoid this term if it has one definition that's so far from what you want. The suffix "-philia" often has a sexual connotation.

Solution 5:

Dragon sickness.

Given that we're talking about dwarves, we could pull from the works of Tolkien and diagnose them with "dragon sickness" that afflicted certain dwarves in his works, as they became obsessed with gold and treasure, much like dragons do. This is an old mythological trope dating back to medieval Europe, with examples like the dwarf Fafnir physically transforming into a dragon as a result of his gold-lust.

"Gold-lust" or "gold lust" is another viable word/phrase to describe it, as well, which is less rooted in one particular author's work.